[FFmpeg-devel] About guess_correct_pts / AVFrame.best_effort_timestamp

[Michael Niedermayer]

On Wed, Feb 16, 2011 at 07:35:08PM +0100, Nicolas George wrote:
> L'octidi 28 pluvi?se, an CCXIX, Michael Niedermayer a ?crit?:
> > it will fail on h264 PAFF
> 
> For my personal enlightenment (and possibly for other curious people on this
> list), could you explain what this and why this is special in a few words?
> 
> The paragraph on wikipedia is not very enlightening.

Mans great always working code:
pts = frame.pkt_pts != AV_NOPTS_VALUE? frame.pkt_pts : prev_pts + 1/framerate;
prev_pts = pts;

will fail on h264 PAFF because that can have a field in a packet or a frame
in a packet 1/framerate is only correct for a frame, for a field it would be
1/(2*framerate)

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20110216/106b0b62/attachment.pgp>