[FFmpeg-devel] About guess_correct_pts / AVFrame.best_effort_timestamp
Ronald S. Bultje
Wed Feb 16 17:34:54 CET 2011
2011/2/16 M?ns Rullg?rd <mans at mansr.com>:
> Nicolas George <nicolas.george at normalesup.org> writes:
>> L'octidi 28 pluvi?se, an CCXIX, M?ns Rullg?rd a ?crit?:
>>> AVI doesn't have timestamps, so the first decoded frame has PTS 0, and
>>> the following ones increment it by 1/framerate. ?Simple.
>> Are you saying that Mr X should put a special case in his code for AVI?
> No, he should put a special case for no PTS on an input frame:
> pts = frame.pkt_pts != AV_NOPTS_VALUE? frame.pkt_pts : prev_pts + 1/framerate;
> prev_pts = pts;
> This code will always work.
This code could be in lavf av_read_frame() even.
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