[FFmpeg-devel] [PATCH v2] avformat/movenc: implicitly enable negative CTS offsets for ismv

[Jan Ekström]

On 7/29/18, Jan Ekström <jeebjp at gmail.com> wrote:
> ISMV lacks any sort of edit list support, as well as tfxd is
> effectively the PTS of the fragment for most intents and purposes.
>
> Thus, if b-frames are requested without negative CTS offsets you
> end up with N frames' worth of delay (tfxd PTS plus the CTS offset
> of the first sample). Negative CTS offsets enable the first sample
> to have CTS=DTS, and thus a/v desync due to b-frame reorder delay
> is avoided.

Hi,

Since this fixes b-frames in ISMV by not adding a double-delay (tfxd
PTS + positive CTS offset), unless someone has any comments I will
push this tonight (JST).

Best regards,
Jan