Thanks Gyan. 2019년 2월 14일 (목) 오후 3:45에 Gyan <[email protected]>님이 작성:
> > > On 14-02-2019 06:39 AM, Yuntaek Lim wrote: > > > > I could not find any constraints about channel count, cannot describe > greater > > than 2, for audioSampleEntry from iso 14496-12:2015. > > However, I've found "When values greater than 2 are used, the codec > > configuration should identify the channel assignment." > > The standard then goes on to say, > > "The audio output format (samplerate, samplesize and channelcount > fields) in the sample entry should be considered definitive only for > codecs that do not record their own output configuration. If the audio > codec has definitive information about the output format, it shall be > taken as definitive; in this case the samplerate, samplesize and > channelcount fields in the sample entry may be ignored, though sensible > values should be chosen (for example, the highest possible sampling rate)" > > For AAC, ASC is added from codec extradata, and provides the definitive > info. > > It may still be helpful to accurately record channel count for AAC, but > it's not required. > > Gyan > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
