[FFmpeg-devel] [PATCH] Implement guessed_pts in avcodec_decode_video2.

[Måns Rullgård]

Jean-Daniel Dupas <devlists at shadowlab.org> writes:

> Le 30 janv. 2011 ? 20:39, M?ns Rullg?rd a ?crit :
>
>> Nicolas George <nicolas.george at normalesup.org> writes:
>> 
>>> Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
>>> ---
>>> cmdutils.c           |   27 ---------------------------
>>> cmdutils.h           |   24 ------------------------
>>> ffmpeg.c             |   14 ++++++--------
>>> ffplay.c             |   10 +++-------
>>> libavcodec/avcodec.h |   20 ++++++++++++++++++++
>>> libavcodec/utils.c   |   43 ++++++++++++++++++++++++++++++++++++++++++-
>>> 6 files changed, 71 insertions(+), 67 deletions(-)
>>> 
>>> This patch moves the guess_correct_pts function from cmdutils to libavcodec.
>>> The feature is available through a new field in AVFrame, guessed_pts.
>>> 
>>> make test and ffplay still work, but I would like to have some more time to
>>> read it carefully, but I have things to do in the next few days, and this
>>> feature was discussed in another thread, so here the current version. It
>>> will conflict with some patches that will certainly soon be applied, so I
>>> will update and submit it again anyway.
>> 
>> What is all this guessing supposed to achieve anyway?  It makes me
>> feel uneasy
>
> Try to play H.264 with reordered frame in avi container without this
> guess, and you will see why it is necessary.

AVI does not have timestamps (only an implied DTS), so the PTS would
be calculated by counting decoded frames and multiplying by the frame
rate.

-- 
M?ns Rullg?rd
mans at mansr.com