BBC uses avc3. Here's an example (thanks to @remitamine for this example)
http://rdmedia.bbc.co.uk/dash/ondemand/bbb/2/client_manifest-common_init.mpd
See also https://trac.ffmpeg.org/ticket/5217
# is not a good fallback for file extensions
return {
'avc1': 'mp4',
# is not a good fallback for file extensions
return {
'avc1': 'mp4',
+ 'avc2': 'mp4',
+ 'avc3': 'mp4',
+ 'avc4': 'mp4',
'mp4a': 'm4a',
'vorbis': 'webm',
'vp9': 'webm',
'mp4a': 'm4a',
'vorbis': 'webm',
'vp9': 'webm',