Merge remote-tracking branch 'jaimeMF/yt-playlists'
[youtube-dl] / youtube_dl / extractor / youtube.py
index b57693ee65283846ceec25e1e873148e044cf2b9..9b09793eb307b4ca899942e57cfa3dda88ec5caa 100644 (file)
@@ -1,33 +1,39 @@
 # coding: utf-8
 
 import collections
-import itertools
+import errno
 import io
+import itertools
 import json
-import netrc
+import os.path
 import re
 import socket
 import string
 import struct
 import traceback
+import xml.etree.ElementTree
 import zlib
 
 from .common import InfoExtractor, SearchInfoExtractor
 from .subtitles import SubtitlesInfoExtractor
 from ..utils import (
+    compat_chr,
     compat_http_client,
     compat_parse_qs,
     compat_urllib_error,
     compat_urllib_parse,
     compat_urllib_request,
+    compat_urlparse,
     compat_str,
 
     clean_html,
+    get_cachedir,
     get_element_by_id,
     ExtractorError,
     unescapeHTML,
     unified_strdate,
     orderedSet,
+    write_json_file,
 )
 
 class YoutubeBaseInfoExtractor(InfoExtractor):
@@ -68,14 +74,8 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
             return False
 
-        galx = None
-        dsh = None
-        match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
-        if match:
-          galx = match.group(1)
-        match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
-        if match:
-          dsh = match.group(1)
+        galx = self._search_regex(r'(?s)<input.+?name="GALX".+?value="(.+?)"',
+                                  login_page, u'Login GALX parameter')
 
         # Log in
         login_form_strs = {
@@ -89,7 +89,6 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
                 u'checkConnection': u'',
                 u'checkedDomains': u'youtube',
                 u'dnConn': u'',
-                u'dsh': dsh,
                 u'pstMsg': u'0',
                 u'rmShown': u'1',
                 u'secTok': u'',
@@ -140,10 +139,10 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
 
 class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
     IE_DESC = u'YouTube.com'
-    _VALID_URL = r"""^
+    _VALID_URL = r"""(?x)^
                      (
-                         (?:https?://)?                                       # http(s):// (optional)
-                         (?:(?:(?:(?:\w+\.)?youtube(?:-nocookie)?\.com/|
+                         (?:https?://|//)?                                    # http(s):// or protocol-independent URL (optional)
+                         (?:(?:(?:(?:\w+\.)?[yY][oO][uU][tT][uU][bB][eE](?:-nocookie)?\.com/|
                             tube\.majestyc\.net/|
                             youtube\.googleapis\.com/)                        # the various hostnames, with wildcard subdomains
                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
@@ -230,11 +229,13 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         '136': 'mp4',
         '137': 'mp4',
         '138': 'mp4',
-        '139': 'mp4',
-        '140': 'mp4',
-        '141': 'mp4',
         '160': 'mp4',
 
+        # Dash mp4 audio
+        '139': 'm4a',
+        '140': 'm4a',
+        '141': 'm4a',
+
         # Dash webm
         '171': 'webm',
         '172': 'webm',
@@ -338,18 +339,6 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
             }
         },
-        {
-            u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
-            u"file":  u"1ltcDfZMA3U.flv",
-            u"note": u"Test VEVO video (#897)",
-            u"info_dict": {
-                u"upload_date": u"20070518",
-                u"title": u"Maps - It Will Find You",
-                u"description": u"Music video by Maps performing It Will Find You.",
-                u"uploader": u"MuteUSA",
-                u"uploader_id": u"MuteUSA"
-            }
-        },
         {
             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
             u"file":  u"UxxajLWwzqY.mp4",
@@ -357,7 +346,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             u"info_dict": {
                 u"upload_date": u"20120506",
                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
-                u"description": u"md5:3e2666e0a55044490499ea45fe9037b7",
+                u"description": u"md5:5b292926389560516e384ac437c0ec07",
                 u"uploader": u"Icona Pop",
                 u"uploader_id": u"IconaPop"
             }
@@ -375,19 +364,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             }
         },
         {
-            u'url': u'https://www.youtube.com/watch?v=TGi3HqYrWHE',
-            u'file': u'TGi3HqYrWHE.mp4',
-            u'note': u'm3u8 video',
-            u'info_dict': {
-                u'title': u'Triathlon - Men - London 2012 Olympic Games',
-                u'description': u'- Men -  TR02 - Triathlon - 07 August 2012 - London 2012 Olympic Games',
-                u'uploader': u'olympic',
-                u'upload_date': u'20120807',
-                u'uploader_id': u'olympic',
-            },
-            u'params': {
-                u'skip_download': True,
-            },
+            u"url":  u"//www.YouTube.com/watch?v=yZIXLfi8CZQ",
+            u"file":  u"yZIXLfi8CZQ.mp4",
+            u"note": u"Embed-only video (#1746)",
+            u"info_dict": {
+                u"upload_date": u"20120608",
+                u"title": u"Principal Sexually Assaults A Teacher - Episode 117 - 8th June 2012",
+                u"description": u"md5:09b78bd971f1e3e289601dfba15ca4f7",
+                u"uploader": u"SET India",
+                u"uploader_id": u"setindia"
+            }
         },
     ]
 
@@ -396,11 +382,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
     def suitable(cls, url):
         """Receives a URL and returns True if suitable for this IE."""
         if YoutubePlaylistIE.suitable(url): return False
-        return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
+        return re.match(cls._VALID_URL, url) is not None
 
     def __init__(self, *args, **kwargs):
         super(YoutubeIE, self).__init__(*args, **kwargs)
-        self._jsplayer_cache = {}
+        self._player_cache = {}
 
     def report_video_webpage_download(self, video_id):
         """Report attempt to download video webpage."""
@@ -422,27 +408,99 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         """Indicate the download will use the RTMP protocol."""
         self.to_screen(u'RTMP download detected')
 
-    def _extract_signature_function(self, video_id, player_url):
-        id_m = re.match(r'.*-(?P<id>[^.]+)\.(?P<ext>[^.]+)$', player_url)
+    def _extract_signature_function(self, video_id, player_url, slen):
+        id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
+                        player_url)
         player_type = id_m.group('ext')
         player_id = id_m.group('id')
 
+        # Read from filesystem cache
+        func_id = '%s_%s_%d' % (player_type, player_id, slen)
+        assert os.path.basename(func_id) == func_id
+        cache_dir = get_cachedir(self._downloader.params)
+
+        cache_enabled = cache_dir is not None
+        if cache_enabled:
+            cache_fn = os.path.join(os.path.expanduser(cache_dir),
+                                    u'youtube-sigfuncs',
+                                    func_id + '.json')
+            try:
+                with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
+                    cache_spec = json.load(cachef)
+                return lambda s: u''.join(s[i] for i in cache_spec)
+            except IOError:
+                pass  # No cache available
+
         if player_type == 'js':
             code = self._download_webpage(
                 player_url, video_id,
-                note=u'Downloading %s player %s' % (player_type, jsplayer_id),
+                note=u'Downloading %s player %s' % (player_type, player_id),
                 errnote=u'Download of %s failed' % player_url)
-            return self._parse_sig_js(code)
-        elif player_tpye == 'swf':
+            res = self._parse_sig_js(code)
+        elif player_type == 'swf':
             urlh = self._request_webpage(
                 player_url, video_id,
-                note=u'Downloading %s player %s' % (player_type, jsplayer_id),
+                note=u'Downloading %s player %s' % (player_type, player_id),
                 errnote=u'Download of %s failed' % player_url)
             code = urlh.read()
-            return self._parse_sig_swf(code)
+            res = self._parse_sig_swf(code)
         else:
             assert False, 'Invalid player type %r' % player_type
 
+        if cache_enabled:
+            try:
+                test_string = u''.join(map(compat_chr, range(slen)))
+                cache_res = res(test_string)
+                cache_spec = [ord(c) for c in cache_res]
+                try:
+                    os.makedirs(os.path.dirname(cache_fn))
+                except OSError as ose:
+                    if ose.errno != errno.EEXIST:
+                        raise
+                write_json_file(cache_spec, cache_fn)
+            except Exception:
+                tb = traceback.format_exc()
+                self._downloader.report_warning(
+                    u'Writing cache to %r failed: %s' % (cache_fn, tb))
+
+        return res
+
+    def _print_sig_code(self, func, slen):
+        def gen_sig_code(idxs):
+            def _genslice(start, end, step):
+                starts = u'' if start == 0 else str(start)
+                ends = (u':%d' % (end+step)) if end + step >= 0 else u':'
+                steps = u'' if step == 1 else (u':%d' % step)
+                return u's[%s%s%s]' % (starts, ends, steps)
+
+            step = None
+            start = '(Never used)'  # Quelch pyflakes warnings - start will be
+                                    # set as soon as step is set
+            for i, prev in zip(idxs[1:], idxs[:-1]):
+                if step is not None:
+                    if i - prev == step:
+                        continue
+                    yield _genslice(start, prev, step)
+                    step = None
+                    continue
+                if i - prev in [-1, 1]:
+                    step = i - prev
+                    start = prev
+                    continue
+                else:
+                    yield u's[%d]' % prev
+            if step is None:
+                yield u's[%d]' % i
+            else:
+                yield _genslice(start, i, step)
+
+        test_string = u''.join(map(compat_chr, range(slen)))
+        cache_res = func(test_string)
+        cache_spec = [ord(c) for c in cache_res]
+        expr_code = u' + '.join(gen_sig_code(cache_spec))
+        code = u'if len(s) == %d:\n    return %s\n' % (slen, expr_code)
+        self.to_screen(u'Extracted signature function:\n' + code)
+
     def _parse_sig_js(self, jscode):
         funcname = self._search_regex(
             r'signature=([a-zA-Z]+)', jscode,
@@ -455,7 +513,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 
         def interpret_statement(stmt, local_vars, allow_recursion=20):
             if allow_recursion < 0:
-                raise ExctractorError(u'Recursion limit reached')
+                raise ExtractorError(u'Recursion limit reached')
 
             if stmt.startswith(u'var '):
                 stmt = stmt[len(u'var '):]
@@ -583,99 +641,83 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                         for tag_code, tag in extract_tags(content)
                         if tag_code == 82)
         p = code_tag.index(b'\0', 4) + 1
+        code_reader = io.BytesIO(code_tag[p:])
 
         # Parse ABC (AVM2 ByteCode)
-        def read_int(data=None, pos=None):
-            if hasattr(data, 'read'):
-                assert pos is None
-
-                res = 0
-                shift = 0
-                for _ in range(5):
-                    buf = data.read(1)
-                    assert len(buf) == 1
-                    b = struct.unpack('<B', buf)[0]
-                    res = res | ((b & 0x7f) << shift)
-                    if b & 0x80 == 0:
-                        break
-                    shift += 7
-                return res
-
-            if data is None:
-                data = code_tag
-            if pos is None:
-                pos = p
+        def read_int(reader=None):
+            if reader is None:
+                reader = code_reader
             res = 0
             shift = 0
             for _ in range(5):
-                b = struct.unpack('<B', data[pos:pos+1])[0]
-                pos += 1
+                buf = reader.read(1)
+                assert len(buf) == 1
+                b = struct.unpack('<B', buf)[0]
                 res = res | ((b & 0x7f) << shift)
                 if b & 0x80 == 0:
                     break
                 shift += 7
-            return (res, pos)
-        assert read_int(b'\x00', 0) == (0, 1)
-        assert read_int(b'\x10', 0) == (16, 1)
-        assert read_int(b'\x34', 0) == (0x34, 1)
-        assert read_int(b'\xb4\x12', 0) == (0x12 * 0x80 + 0x34, 2)
-        assert read_int(b'\xff\xff\xff\x00', 0) == (0x1fffff, 4)
-
-        def u30(*args, **kwargs):
-            res = read_int(*args, **kwargs)
-            if isinstance(res, tuple):
-                assert res[0] & 0xf0000000 == 0
-            else:
-                assert res & 0xf0000000 == 0
+            return res
+
+        def u30(reader=None):
+            res = read_int(reader)
+            assert res & 0xf0000000 == 0
             return res
         u32 = read_int
 
-        def s32(data=None, pos=None):
-            v, pos = read_int(data, pos)
+        def s32(reader=None):
+            v = read_int(reader)
             if v & 0x80000000 != 0:
                 v = - ((v ^ 0xffffffff) + 1)
-            return (v, pos)
-        assert s32(b'\xff\xff\xff\xff\x0f', 0) == (-1, 5)
-
-        def string():
-            slen, p = u30()
-            return (code_tag[p:p+slen].decode('utf-8'), p + slen)
-
-        def read_byte(data=None, pos=None):
-            if data is None:
-                data = code_tag
-            if pos is None:
-                pos = p
-            res = struct.unpack('<B', data[pos:pos+1])[0]
-            return (res, pos + 1)
+            return v
+
+        def read_string(reader=None):
+            if reader is None:
+                reader = code_reader
+            slen = u30(reader)
+            resb = reader.read(slen)
+            assert len(resb) == slen
+            return resb.decode('utf-8')
+
+        def read_bytes(count, reader=None):
+            if reader is None:
+                reader = code_reader
+            resb = reader.read(count)
+            assert len(resb) == count
+            return resb
+
+        def read_byte(reader=None):
+            resb = read_bytes(1, reader=reader)
+            res = struct.unpack('<B', resb)[0]
+            return res
 
         # minor_version + major_version
-        p += 2 + 2
+        read_bytes(2 + 2)
 
         # Constant pool
-        int_count, p = u30()
+        int_count = u30()
         for _c in range(1, int_count):
-            _, p = s32()
-        uint_count, p = u30()
+            s32()
+        uint_count = u30()
         for _c in range(1, uint_count):
-            _, p = u32()
-        double_count, p = u30()
-        p += (double_count-1) * 8
-        string_count, p = u30()
+            u32()
+        double_count = u30()
+        read_bytes((double_count-1) * 8)
+        string_count = u30()
         constant_strings = [u'']
         for _c in range(1, string_count):
-            s, p = string()
+            s = read_string()
             constant_strings.append(s)
-        namespace_count, p = u30()
+        namespace_count = u30()
         for _c in range(1, namespace_count):
-            p += 1        # kind
-            _, p = u30()  # name
-        ns_set_count, p = u30()
+            read_bytes(1)  # kind
+            u30()  # name
+        ns_set_count = u30()
         for _c in range(1, ns_set_count):
-            count, p = u30()
+            count = u30()
             for _c2 in range(count):
-                _, p = u30()
-        multiname_count, p = u30()
+                u30()
+        multiname_count = u30()
         MULTINAME_SIZES = {
             0x07: 2,  # QName
             0x0d: 2,  # QNameA
@@ -690,108 +732,106 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         }
         multinames = [u'']
         for _c in range(1, multiname_count):
-            kind, p = u30()
+            kind = u30()
             assert kind in MULTINAME_SIZES, u'Invalid multiname kind %r' % kind
             if kind == 0x07:
-                namespace_idx, p = u30()
-                name_idx, p = u30()
+                u30()  # namespace_idx
+                name_idx = u30()
                 multinames.append(constant_strings[name_idx])
             else:
                 multinames.append('[MULTINAME kind: %d]' % kind)
                 for _c2 in range(MULTINAME_SIZES[kind]):
-                    _, p = u30()
+                    u30()
 
         # Methods
-        method_count, p = u30()
+        method_count = u30()
         MethodInfo = collections.namedtuple(
             'MethodInfo',
             ['NEED_ARGUMENTS', 'NEED_REST'])
         method_infos = []
         for method_id in range(method_count):
-            param_count, p = u30()
-            _, p = u30()  # return type
+            param_count = u30()
+            u30()  # return type
             for _ in range(param_count):
-                _, p = u30()  # param type
-            _, p = u30()  # name index (always 0 for youtube)
-            flags, p = read_byte()
+                u30()  # param type
+            u30()  # name index (always 0 for youtube)
+            flags = read_byte()
             if flags & 0x08 != 0:
                 # Options present
-                option_count, p = u30()
+                option_count = u30()
                 for c in range(option_count):
-                    _, p = u30()  # val
-                    p += 1        # kind
+                    u30()  # val
+                    read_bytes(1)  # kind
             if flags & 0x80 != 0:
                 # Param names present
                 for _ in range(param_count):
-                    _, p = u30()  # param name
+                    u30()  # param name
             mi = MethodInfo(flags & 0x01 != 0, flags & 0x04 != 0)
             method_infos.append(mi)
 
         # Metadata
-        metadata_count, p = u30()
+        metadata_count = u30()
         for _c in range(metadata_count):
-            _, p = u30()  # name
-            item_count, p = u30()
+            u30()  # name
+            item_count = u30()
             for _c2 in range(item_count):
-                _, p = u30()  # key
-                _, p = u30()  # value
-
-        def parse_traits_info(pos=None):
-            if pos is None:
-                pos = p
-            trait_name_idx, pos = u30(pos=pos)
-            kind_full, pos = read_byte(pos=pos)
+                u30()  # key
+                u30()  # value
+
+        def parse_traits_info():
+            trait_name_idx = u30()
+            kind_full = read_byte()
             kind = kind_full & 0x0f
             attrs = kind_full >> 4
             methods = {}
             if kind in [0x00, 0x06]:  # Slot or Const
-                _, pos = u30(pos=pos)  # Slot id
-                type_name_idx, pos = u30(pos=pos)
-                vindex, pos = u30(pos=pos)
+                u30()  # Slot id
+                u30()  # type_name_idx
+                vindex = u30()
                 if vindex != 0:
-                    _, pos = read_byte(pos=pos)  # vkind
+                    read_byte()  # vkind
             elif kind in [0x01, 0x02, 0x03]:  # Method / Getter / Setter
-                _, pos = u30(pos=pos)  # disp_id
-                method_idx, pos = u30(pos=pos)
+                u30()  # disp_id
+                method_idx = u30()
                 methods[multinames[trait_name_idx]] = method_idx
             elif kind == 0x04:  # Class
-                _, pos = u30(pos=pos)  # slot_id
-                _, pos = u30(pos=pos)  # classi
+                u30()  # slot_id
+                u30()  # classi
             elif kind == 0x05:  # Function
-                _, pos = u30(pos=pos)  # slot_id
-                function_idx, pos = u30(pos=pos)
+                u30()  # slot_id
+                function_idx = u30()
                 methods[function_idx] = multinames[trait_name_idx]
             else:
                 raise ExtractorError(u'Unsupported trait kind %d' % kind)
 
             if attrs & 0x4 != 0:  # Metadata present
-                metadata_count, pos = u30(pos=pos)
+                metadata_count = u30()
                 for _c3 in range(metadata_count):
-                    _, pos = u30(pos=pos)
+                    u30()  # metadata index
 
-            return (methods, pos)
+            return methods
 
         # Classes
         TARGET_CLASSNAME = u'SignatureDecipher'
         searched_idx = multinames.index(TARGET_CLASSNAME)
         searched_class_id = None
-        class_count, p = u30()
+        class_count = u30()
         for class_id in range(class_count):
-            name_idx, p = u30()
+            name_idx = u30()
             if name_idx == searched_idx:
                 # We found the class we're looking for!
                 searched_class_id = class_id
-            _, p = u30()  # super_name idx
-            flags, p = read_byte()
+            u30()  # super_name idx
+            flags = read_byte()
             if flags & 0x08 != 0:  # Protected namespace is present
-                protected_ns_idx, p = u30()
-            intrf_count, p = u30()
+                u30()  # protected_ns_idx
+            intrf_count = u30()
             for _c2 in range(intrf_count):
-                _, p = u30()
-            _, p = u30()  # iinit
-            trait_count, p = u30()
+                u30()
+            u30()  # iinit
+            trait_count = u30()
             for _c2 in range(trait_count):
-                _, p = parse_traits_info()
+                parse_traits_info()
 
         if searched_class_id is None:
             raise ExtractorError(u'Target class %r not found' %
@@ -800,10 +840,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         method_names = {}
         method_idxs = {}
         for class_id in range(class_count):
-            _, p = u30()  # cinit
-            trait_count, p = u30()
+            u30()  # cinit
+            trait_count = u30()
             for _c2 in range(trait_count):
-                trait_methods, p = parse_traits_info()
+                trait_methods = parse_traits_info()
                 if class_id == searched_class_id:
                     method_names.update(trait_methods.items())
                     method_idxs.update(dict(
@@ -811,40 +851,40 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                         for name, idx in trait_methods.items()))
 
         # Scripts
-        script_count, p = u30()
+        script_count = u30()
         for _c in range(script_count):
-            _, p = u30()  # init
-            trait_count, p = u30()
+            u30()  # init
+            trait_count = u30()
             for _c2 in range(trait_count):
-                _, p = parse_traits_info()
+                parse_traits_info()
 
         # Method bodies
-        method_body_count, p = u30()
+        method_body_count = u30()
         Method = collections.namedtuple('Method', ['code', 'local_count'])
         methods = {}
         for _c in range(method_body_count):
-            method_idx, p = u30()
-            max_stack, p = u30()
-            local_count, p = u30()
-            init_scope_depth, p = u30()
-            max_scope_depth, p = u30()
-            code_length, p = u30()
+            method_idx = u30()
+            u30()  # max_stack
+            local_count = u30()
+            u30()  # init_scope_depth
+            u30()  # max_scope_depth
+            code_length = u30()
+            code = read_bytes(code_length)
             if method_idx in method_idxs:
-                m = Method(code_tag[p:p+code_length], local_count)
+                m = Method(code, local_count)
                 methods[method_idxs[method_idx]] = m
-            p += code_length
-            exception_count, p = u30()
+            exception_count = u30()
             for _c2 in range(exception_count):
-                _, p = u30()  # from
-                _, p = u30()  # to
-                _, p = u30()  # target
-                _, p = u30()  # exc_type
-                _, p = u30()  # var_name
-            trait_count, p = u30()
+                u30()  # from
+                u30()  # to
+                u30()  # target
+                u30()  # exc_type
+                u30()  # var_name
+            trait_count = u30()
             for _c2 in range(trait_count):
-                _, p = parse_traits_info()
+                parse_traits_info()
 
-        assert p == len(code_tag)
+        assert p + code_reader.tell() == len(code_tag)
         assert len(methods) == len(method_idxs)
 
         method_pyfunctions = {}
@@ -857,7 +897,6 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             m = methods[func_name]
 
             def resfunc(args):
-                print('Entering function %s(%r)' % (func_name, args))
                 registers = ['(this)'] + list(args) + [None] * m.local_count
                 stack = []
                 coder = io.BytesIO(m.code)
@@ -958,7 +997,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                             assert isinstance(obj, list)
                             stack.append(obj[idx])
                     elif opcode == 128:  # coerce
-                        _ = u30(coder)
+                        u30(coder)
                     elif opcode == 133:  # coerce_s
                         assert isinstance(stack[-1], (type(None), compat_str))
                     elif opcode == 164:  # modulo
@@ -988,30 +1027,47 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         initial_function = extract_function(u'decipher')
         return lambda s: initial_function([s])
 
-    def _decrypt_signature(self, s, video_id, jsplayer_url, age_gate=False):
+    def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
         """Turn the encrypted s field into a working signature"""
 
-        if jsplayer_url is not None:
+        if player_url is not None:
+            if player_url.startswith(u'//'):
+                player_url = u'https:' + player_url
             try:
-                if jsplayer_url not in self._jsplayer_cache:
-                    self._jsplayer_cache[jsplayer_url] = self._extract_signature_function(
-                        video_id, jsplayer_url
+                player_id = (player_url, len(s))
+                if player_id not in self._player_cache:
+                    func = self._extract_signature_function(
+                        video_id, player_url, len(s)
                     )
-                return self._jsplayer_cache[jsplayer_url]([s])
-            except Exception as e:
+                    self._player_cache[player_id] = func
+                func = self._player_cache[player_id]
+                if self._downloader.params.get('youtube_print_sig_code'):
+                    self._print_sig_code(func, len(s))
+                return func(s)
+            except Exception:
                 tb = traceback.format_exc()
-                self._downloader.report_warning(u'Automatic signature extraction failed: ' + tb)
+                self._downloader.report_warning(
+                    u'Automatic signature extraction failed: ' + tb)
+
+            self._downloader.report_warning(
+                u'Warning: Falling back to static signature algorithm')
 
-        self._downloader.report_warning(u'Warning: Falling back to static signature algorithm')
+        return self._static_decrypt_signature(
+            s, video_id, player_url, age_gate)
 
+    def _static_decrypt_signature(self, s, video_id, player_url, age_gate):
         if age_gate:
             # The videos with age protection use another player, so the
             # algorithms can be different.
             if len(s) == 86:
                 return s[2:63] + s[82] + s[64:82] + s[63]
 
-        if len(s) == 92:
+        if len(s) == 93:
+            return s[86:29:-1] + s[88] + s[28:5:-1]
+        elif len(s) == 92:
             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
+        elif len(s) == 91:
+            return s[84:27:-1] + s[86] + s[26:5:-1]
         elif len(s) == 90:
             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
         elif len(s) == 89:
@@ -1021,15 +1077,15 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         elif len(s) == 87:
             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
         elif len(s) == 86:
-            return s[5:34] + s[0] + s[35:38] + s[3] + s[39:45] + s[38] + s[46:53] + s[73] + s[54:73] + s[85] + s[74:85] + s[53]
+            return s[80:72:-1] + s[16] + s[71:39:-1] + s[72] + s[38:16:-1] + s[82] + s[15::-1]
         elif len(s) == 85:
             return s[3:11] + s[0] + s[12:55] + s[84] + s[56:84]
         elif len(s) == 84:
-            return s[81:36:-1] + s[0] + s[35:2:-1]
+            return s[78:70:-1] + s[14] + s[69:37:-1] + s[70] + s[36:14:-1] + s[80] + s[:14][::-1]
         elif len(s) == 83:
-            return s[81:64:-1] + s[82] + s[63:52:-1] + s[45] + s[51:45:-1] + s[1] + s[44:1:-1] + s[0]
+            return s[80:63:-1] + s[0] + s[62:0:-1] + s[63]
         elif len(s) == 82:
-            return s[80:73:-1] + s[81] + s[72:54:-1] + s[2] + s[53:43:-1] + s[0] + s[42:2:-1] + s[43] + s[1] + s[54]
+            return s[80:37:-1] + s[7] + s[36:7:-1] + s[0] + s[6:0:-1] + s[37]
         elif len(s) == 81:
             return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
         elif len(s) == 80:
@@ -1040,16 +1096,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         else:
             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 
-    def _decrypt_signature_age_gate(self, s):
-        # The videos with age protection use another player, so the algorithms
-        # can be different.
-        if len(s) == 86:
-            return s[2:63] + s[82] + s[64:82] + s[63]
-        else:
-            # Fallback to the other algortihms
-            return self._decrypt_signature(s)
-
-    def _get_available_subtitles(self, video_id):
+    def _get_available_subtitles(self, video_id, webpage):
         try:
             sub_list = self._download_webpage(
                 'http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
@@ -1065,7 +1112,8 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             params = compat_urllib_parse.urlencode({
                 'lang': lang,
                 'v': video_id,
-                'fmt': self._downloader.params.get('subtitlesformat'),
+                'fmt': self._downloader.params.get('subtitlesformat', 'srt'),
+                'name': l[0].encode('utf-8'),
             })
             url = u'http://www.youtube.com/api/timedtext?' + params
             sub_lang_list[lang] = url
@@ -1077,7 +1125,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
     def _get_available_automatic_caption(self, video_id, webpage):
         """We need the webpage for getting the captions url, pass it as an
            argument to speed up the process."""
-        sub_format = self._downloader.params.get('subtitlesformat')
+        sub_format = self._downloader.params.get('subtitlesformat', 'srt')
         self.to_screen(u'%s: Looking for automatic captions' % video_id)
         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
         err_msg = u'Couldn\'t find automatic captions for %s' % video_id
@@ -1099,7 +1147,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             list_page = self._download_webpage(list_url, video_id)
             caption_list = xml.etree.ElementTree.fromstring(list_page.encode('utf-8'))
             original_lang_node = caption_list.find('track')
-            if original_lang_node.attrib.get('kind') != 'asr' :
+            if original_lang_node is None or original_lang_node.attrib.get('kind') != 'asr' :
                 self._downloader.report_warning(u'Video doesn\'t have automatic captions')
                 return {}
             original_lang = original_lang_node.attrib['lang_code']
@@ -1199,10 +1247,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             url_map[itag] = format_url
         return url_map
 
-    def _real_extract(self, url):
-        if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
-            self._downloader.report_warning(u'Did you forget to quote the URL? Remember that & is a meta-character in most shells, so you want to put the URL in quotes, like  youtube-dl \'http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc\' (or simply  youtube-dl BaW_jenozKc  ).')
+    def _extract_annotations(self, video_id):
+        url = 'https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=%s' % video_id
+        return self._download_webpage(url, video_id, note=u'Searching for annotations.', errnote=u'Unable to download video annotations.')
 
+    def _real_extract(self, url):
         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
         mobj = re.search(self._NEXT_URL_RE, url)
         if mobj:
@@ -1235,7 +1284,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             # We simulate the access to the video from www.youtube.com/v/{video_id}
             # this can be viewed without login into Youtube
             data = compat_urllib_parse.urlencode({'video_id': video_id,
-                                                  'el': 'embedded',
+                                                  'el': 'player_embedded',
                                                   'gl': 'US',
                                                   'hl': 'en',
                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
@@ -1264,6 +1313,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             else:
                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
 
+        if 'view_count' in video_info:
+            view_count = int(video_info['view_count'][0])
+        else:
+            view_count = None
+
         # Check for "rental" videos
         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
             raise ExtractorError(u'"rental" videos not supported')
@@ -1285,9 +1339,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             self._downloader.report_warning(u'unable to extract uploader nickname')
 
         # title
-        if 'title' not in video_info:
-            raise ExtractorError(u'Unable to extract video title')
-        video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
+        if 'title' in video_info:
+            video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
+        else:
+            self._downloader.report_warning(u'Unable to extract video title')
+            video_title = u'_'
 
         # thumbnail image
         # We try first to get a high quality image:
@@ -1297,7 +1353,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             video_thumbnail = m_thumb.group(1)
         elif 'thumbnail_url' not in video_info:
             self._downloader.report_warning(u'unable to extract video thumbnail')
-            video_thumbnail = ''
+            video_thumbnail = None
         else:   # don't panic if we can't find it
             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
 
@@ -1332,6 +1388,11 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
         else:
             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
 
+        # annotations
+        video_annotations = None
+        if self._downloader.params.get('writeannotations', False):
+                video_annotations = self._extract_annotations(video_id)
+
         # Decide which formats to download
 
         try:
@@ -1342,32 +1403,31 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
             args = info['args']
             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
             # this signatures are encrypted
-            m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
+            if 'url_encoded_fmt_stream_map' not in args:
+                raise ValueError(u'No stream_map present')  # caught below
+            re_signature = re.compile(r'[&,]s=')
+            m_s = re_signature.search(args['url_encoded_fmt_stream_map'])
             if m_s is not None:
                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
-            m_s = re.search(r'[&,]s=', args.get('adaptive_fmts', u''))
+            m_s = re_signature.search(args.get('adaptive_fmts', u''))
             if m_s is not None:
-                if 'url_encoded_fmt_stream_map' in video_info:
-                    video_info['url_encoded_fmt_stream_map'][0] += ',' + args['adaptive_fmts']
-                else:
-                    video_info['url_encoded_fmt_stream_map'] = [args['adaptive_fmts']]
-            elif 'adaptive_fmts' in video_info:
-                if 'url_encoded_fmt_stream_map' in video_info:
-                    video_info['url_encoded_fmt_stream_map'][0] += ',' + video_info['adaptive_fmts'][0]
+                if 'adaptive_fmts' in video_info:
+                    video_info['adaptive_fmts'][0] += ',' + args['adaptive_fmts']
                 else:
-                    video_info['url_encoded_fmt_stream_map'] = video_info['adaptive_fmts']
+                    video_info['adaptive_fmts'] = [args['adaptive_fmts']]
         except ValueError:
             pass
 
         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
             self.report_rtmp_download()
             video_url_list = [(None, video_info['conn'][0])]
-        elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
-            if 'rtmpe%3Dyes' in video_info['url_encoded_fmt_stream_map'][0]:
+        elif len(video_info.get('url_encoded_fmt_stream_map', [])) >= 1 or len(video_info.get('adaptive_fmts', [])) >= 1:
+            encoded_url_map = video_info.get('url_encoded_fmt_stream_map', [''])[0] + ',' + video_info.get('adaptive_fmts',[''])[0]
+            if 'rtmpe%3Dyes' in encoded_url_map:
                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
             url_map = {}
-            for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
+            for url_data_str in encoded_url_map.split(','):
                 url_data = compat_parse_qs(url_data_str)
                 if 'itag' in url_data and 'url' in url_data:
                     url = url_data['url'][0]
@@ -1377,12 +1437,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                         encrypted_sig = url_data['s'][0]
                         if self._downloader.params.get('verbose'):
                             if age_gate:
-                                player_version = self._search_regex(r'-(.+)\.swf$',
-                                    player_url if player_url else 'NOT FOUND',
-                                    'flash player', fatal=False)
+                                if player_url is None:
+                                    player_version = 'unknown'
+                                else:
+                                    player_version = self._search_regex(
+                                        r'-(.+)\.swf$', player_url,
+                                        u'flash player', fatal=False)
                                 player_desc = 'flash player %s' % player_version
                             else:
-                                player_version = self._search_regex(r'html5player-(.+?)\.js', video_webpage,
+                                player_version = self._search_regex(
+                                    r'html5player-(.+?)\.js', video_webpage,
                                     'html5 player', fatal=False)
                                 player_desc = u'html5 player %s' % player_version
 
@@ -1390,15 +1454,14 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
                                 (len(encrypted_sig), parts_sizes, url_data['itag'][0], player_desc))
 
-                        if age_gate:
-                            jsplayer_url = None
-                        else:
+                        if not age_gate:
                             jsplayer_url_json = self._search_regex(
                                 r'"assets":.+?"js":\s*("[^"]+")',
                                 video_webpage, u'JS player URL')
-                            jsplayer_url = json.loads(jsplayer_url_json)
+                            player_url = json.loads(jsplayer_url_json)
 
-                        signature = self._decrypt_signature(encrypted_sig, video_id, jsplayer_url, age_gate)
+                        signature = self._decrypt_signature(
+                            encrypted_sig, video_id, player_url, age_gate)
                         url += '&signature=' + signature
                     if 'ratebypass' not in url:
                         url += '&ratebypass=yes'
@@ -1414,16 +1477,16 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                 return
 
         else:
-            raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
+            raise ExtractorError(u'no conn, hlsvp or url_encoded_fmt_stream_map information found in video info')
 
         results = []
-        for format_param, video_real_url in video_url_list:
+        for itag, video_real_url in video_url_list:
             # Extension
-            video_extension = self._video_extensions.get(format_param, 'flv')
+            video_extension = self._video_extensions.get(itag, 'flv')
 
-            video_format = '{0} - {1}{2}'.format(format_param if format_param else video_extension,
-                                              self._video_dimensions.get(format_param, '???'),
-                                              ' ('+self._special_itags[format_param]+')' if format_param in self._special_itags else '')
+            video_format = '{0} - {1}{2}'.format(itag if itag else video_extension,
+                                              self._video_dimensions.get(itag, '???'),
+                                              ' ('+self._special_itags[itag]+')' if itag in self._special_itags else '')
 
             results.append({
                 'id':       video_id,
@@ -1434,15 +1497,20 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
                 'title':    video_title,
                 'ext':      video_extension,
                 'format':   video_format,
+                'format_id': itag,
                 'thumbnail':    video_thumbnail,
                 'description':  video_description,
                 'player_url':   player_url,
                 'subtitles':    video_subtitles,
-                'duration':     video_duration
+                'duration':     video_duration,
+                'age_limit':    18 if age_gate else 0,
+                'annotations':  video_annotations,
+                'webpage_url': 'https://www.youtube.com/watch?v=%s' % video_id,
+                'view_count': view_count,
             })
         return results
 
-class YoutubePlaylistIE(InfoExtractor):
+class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
     IE_DESC = u'YouTube.com playlists'
     _VALID_URL = r"""(?:
                         (?:https?://)?
@@ -1458,8 +1526,9 @@ class YoutubePlaylistIE(InfoExtractor):
                      |
                         ((?:PL|EC|UU|FL)[0-9A-Za-z-_]{10,})
                      )"""
-    _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
-    _MAX_RESULTS = 50
+    _TEMPLATE_URL = 'https://www.youtube.com/playlist?list=%s&page=%s'
+    _MORE_PAGES_INDICATOR = r'data-link-type="next"'
+    _VIDEO_RE = r'href="/watch\?v=([0-9A-Za-z_-]{11})&amp;'
     IE_NAME = u'youtube:playlist'
 
     @classmethod
@@ -1467,54 +1536,48 @@ class YoutubePlaylistIE(InfoExtractor):
         """Receives a URL and returns True if suitable for this IE."""
         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 
+    def _real_initialize(self):
+        self._login()
+
     def _real_extract(self, url):
         # Extract playlist id
         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
         if mobj is None:
             raise ExtractorError(u'Invalid URL: %s' % url)
-
-        # Download playlist videos from API
         playlist_id = mobj.group(1) or mobj.group(2)
-        videos = []
+
+        # Check if it's a video-specific URL
+        query_dict = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
+        if 'v' in query_dict:
+            video_id = query_dict['v'][0]
+            if self._downloader.params.get('noplaylist'):
+                self.to_screen(u'Downloading just video %s because of --no-playlist' % video_id)
+                return self.url_result('https://www.youtube.com/watch?v=' + video_id, 'Youtube')
+            else:
+                self.to_screen(u'Downloading playlist PL%s - add --no-playlist to just download video %s' % (playlist_id, video_id))
+
+        # Extract the video ids from the playlist pages
+        ids = []
 
         for page_num in itertools.count(1):
-            start_index = self._MAX_RESULTS * (page_num - 1) + 1
-            if start_index >= 1000:
-                self._downloader.report_warning(u'Max number of results reached')
-                break
-            url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, start_index)
+            url = self._TEMPLATE_URL % (playlist_id, page_num)
             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
+            # The ids are duplicated
+            new_ids = orderedSet(re.findall(self._VIDEO_RE, page))
+            ids.extend(new_ids)
 
-            try:
-                response = json.loads(page)
-            except ValueError as err:
-                raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
-
-            if 'feed' not in response:
-                raise ExtractorError(u'Got a malformed response from YouTube API')
-            playlist_title = response['feed']['title']['$t']
-            if 'entry' not in response['feed']:
-                # Number of videos is a multiple of self._MAX_RESULTS
+            if re.search(self._MORE_PAGES_INDICATOR, page) is None:
                 break
 
-            for entry in response['feed']['entry']:
-                index = entry['yt$position']['$t']
-                if 'media$group' in entry and 'yt$videoid' in entry['media$group']:
-                    videos.append((
-                        index,
-                        'https://www.youtube.com/watch?v=' + entry['media$group']['yt$videoid']['$t']
-                    ))
+        playlist_title = self._og_search_title(page)
 
-        videos = [v[1] for v in sorted(videos)]
-
-        url_results = [self.url_result(vurl, 'Youtube') for vurl in videos]
-        return [self.playlist_result(url_results, playlist_id, playlist_title)]
+        url_results = [self.url_result(vid, 'Youtube') for vid in ids]
+        return self.playlist_result(url_results, playlist_id, playlist_title)
 
 
 class YoutubeChannelIE(InfoExtractor):
     IE_DESC = u'YouTube.com channels'
     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
-    _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
     _MORE_PAGES_URL = 'http://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
     IE_NAME = u'youtube:channel'
@@ -1535,29 +1598,30 @@ class YoutubeChannelIE(InfoExtractor):
         # Download channel page
         channel_id = mobj.group(1)
         video_ids = []
-        pagenum = 1
-
-        url = self._TEMPLATE_URL % (channel_id, pagenum)
-        page = self._download_webpage(url, channel_id,
-                                      u'Downloading page #%s' % pagenum)
-
-        # Extract video identifiers
-        ids_in_page = self.extract_videos_from_page(page)
-        video_ids.extend(ids_in_page)
+        url = 'https://www.youtube.com/channel/%s/videos' % channel_id
+        channel_page = self._download_webpage(url, channel_id)
+        if re.search(r'channel-header-autogenerated-label', channel_page) is not None:
+            autogenerated = True
+        else:
+            autogenerated = False
 
-        # Download any subsequent channel pages using the json-based channel_ajax query
-        if self._MORE_PAGES_INDICATOR in page:
+        if autogenerated:
+            # The videos are contained in a single page
+            # the ajax pages can't be used, they are empty
+            video_ids = self.extract_videos_from_page(channel_page)
+        else:
+            # Download all channel pages using the json-based channel_ajax query
             for pagenum in itertools.count(1):
                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
                 page = self._download_webpage(url, channel_id,
                                               u'Downloading page #%s' % pagenum)
-
+    
                 page = json.loads(page)
-
+    
                 ids_in_page = self.extract_videos_from_page(page['content_html'])
                 video_ids.extend(ids_in_page)
-
-                if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
+    
+                if self._MORE_PAGES_INDICATOR not in page['load_more_widget_html']:
                     break
 
         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
@@ -1569,7 +1633,7 @@ class YoutubeChannelIE(InfoExtractor):
 
 class YoutubeUserIE(InfoExtractor):
     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
-    _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?)|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
+    _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?(?!(?:attribution_link|watch)(?:$|[^a-z_A-Z0-9-])))|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
     _GDATA_PAGE_SIZE = 50
     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
@@ -1674,6 +1738,10 @@ class YoutubeSearchIE(SearchInfoExtractor):
         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
         return self.playlist_result(videos, query)
 
+class YoutubeSearchDateIE(YoutubeSearchIE):
+    _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc&orderby=published'
+    _SEARCH_KEY = 'ytsearchdate'
+    IE_DESC = u'YouTube.com searches, newest videos first'
 
 class YoutubeShowIE(InfoExtractor):
     IE_DESC = u'YouTube.com (multi-season) shows'
@@ -1762,3 +1830,18 @@ class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
         return self.url_result(playlist_id, 'YoutubePlaylist')
+
+
+class YoutubeTruncatedURLIE(InfoExtractor):
+    IE_NAME = 'youtube:truncated_url'
+    IE_DESC = False  # Do not list
+    _VALID_URL = r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$'
+
+    def _real_extract(self, url):
+        raise ExtractorError(
+            u'Did you forget to quote the URL? Remember that & is a meta '
+            u'character in most shells, so you want to put the URL in quotes, '
+            u'like  youtube-dl '
+            u'\'http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc\''
+            u' (or simply  youtube-dl BaW_jenozKc  ).',
+            expected=True)