Zongyao QU <zongyao.qu <at> gmail.com> writes: > it seams that different demuxer has different track counting mechanism. > > as for lavf, lavf will count the audio and video tracks globally. Your observations are correct. Note that the alternative to lavf's behaviour, trying to forward stream id's to the user is also not always useful: a truehd and an ac3 stream typically share a stream id in a transport stream if you play Blu-ray. Carl Eugen
