[downloader/external] check for ffmpeg availablity when it used for m3u8 download

diff --git a/youtube_dl/downloader/external.py b/youtube_dl/downloader/external.py
index 85cf834c7d69a873141a8ab1ea6299742bd0185f..845a63e931e5f7a6c57e6c19812f156665f460ab 100644 (file)
--- a/youtube_dl/downloader/external.py
+++ b/youtube_dl/downloader/external.py
@@ -175,6 +175,9 @@ class FFmpegFD(ExternalFD):
     def _call_downloader(self, tmpfilename, info_dict):
         url = info_dict['url']
         ffpp = FFmpegPostProcessor(downloader=self)
+        if not ffpp.available:
+            self.report_error('m3u8 download detected but ffmpeg or avconv could not be found. Please install one.')
+            return False
         ffpp.check_version()
 
         args = [ffpp.executable, '-y']