> On Feb 12, 2019, at 12:49 AM, Yuntaek Lim <yuntaek....@gmail.com> wrote: > > I've created 5.1 channel aac-lc audio from 5.1 channel ac-3 audio. > However, the sample entry of "mp4a" box show channel_count as "2", not "6". > Howerver, the MPEG-4 elementary stream descriptor in "esds" box describes > channel count as 6.
It is an old container format with varied history. Many fields in iso container file boxes are just there to maintain compatibility, and ignored & set to default value. In this case, the channel count could only be 1 or 2, for mono and stereo. The default happens to be 2. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
