[Libav-user] Is frame with PTS needed for every fps interval?

Ken Bass daytooner at gmail.com
Thu May 15 04:55:27 CEST 2014

To put it another way: must there be a one-to-one correspondence between
the frame interval and the PTS? That is, if I initialize the stream for
30fps, must frame 0 have PTS 0, frame 1 have PTS 33000, frame 2 have PTS

What I would like to do is this:

I write out the first frame with PTS of 0. I write out the next frame with
PTS of 50000 (50ms). The next with PTS of 90000 (90ms).

Will libav let me do this? And what happens with playback?

If need be, I can simply duplicate the last frame if a new one is not
available at the expected interval. But, then, what if a new frame arrives
in between intervals? Can I set its PTS the the actual PTS, or must it be
adjusted up to the next interval?

Thanks for the response.


On Wed, May 14, 2014 at 4:38 PM, NITIN GOYAL <nitinkumgoyal at gmail.com>wrote:

> On Wed, May 14, 2014 at 10:30 AM, Ken Bass <daytooner at gmail.com> wrote:
>> Question: can I simply write out each frame as I receive it, with an
>> appropriate PTS? This would most likely skip expected frames. Also, the
>> captured frame most likely wouldn't be written at the specified fps
>> interval.
> I think I am not clear on your question but as per my understanding, For
> the raw frames, if you will get them in a proper manner of PT, ti will
> create less issues in encoding process. May be you can buffer some frames
> and then send it to encode the frames and thus there wont be any skipped
> frames.
> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/libav-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://ffmpeg.org/pipermail/libav-user/attachments/20140514/ffcb406f/attachment.html>

More information about the Libav-user mailing list