From: Philipp Hagemeister <phihag@phihag.de>
Date: Thu, 26 Dec 2013 20:19:00 +0000 (+0100)
Subject: Document that format_id field should be present
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=5d4f3985be84679f1b2e3b6dbb31b8625a17d598;p=youtube-dl

Document that format_id field should be present
---

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 6fa60622e..f34d36cb0 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -51,7 +51,8 @@ class InfoExtractor(object):
                                  Calculated from the format_id, width, height.
                                  and format_note fields if missing.
                     * format_id  A short description of the format
-                                 ("mp4_h264_opus" or "19")
+                                 ("mp4_h264_opus" or "19").
+                                Technically optional, but strongly recommended.
                     * format_note Additional info about the format
                                  ("3D" or "DASH video")
                     * width      Width of the video, if known