[FFmpeg-devel] [PATCH] matroskadec: Improve TTA duration calculation

[James Almer]

On 16/08/13 7:24 AM, Paul B Mahol wrote:
> On 8/15/13, James Almer <jamrial at gmail.com> wrote:
>> -            avio_wl32(&b, matroska->ctx->duration *
>> track->audio.out_samplerate);
>> +            avio_wl32(&b, av_rescale(matroska->ctx->duration,
>> track->audio.out_samplerate, AV_TIME_BASE));
> 
> Isn't time base variable thing that can be changed by muxer?
> 
> Perhaps this could be used when muxing tta files to make sure
> last packet can always decode.

Our muxer already uses 1000000 (aka AV_TIME_BASE) as timescale for every file. 
Other muxers use values like round(1000000000 / sampleRate), which seems to be
recommended for audio-only matroska: 
http://matroska.org/technical/specs/notes.html