Paul I agree with you, but the thing is that i dont found a good example
or explain about how to get that working, even to set the DTS. Can you
give to me a resource?
On 1/2/23 18:01, Paul B Mahol wrote:
On Mon, Jan 2, 2023 at 9:48 PM Luis Felipe Domínguez Vega via
Libav-user <[email protected]> wrote:
Found the best documentation about ffmpeg outside ffmpeg.
https://github.com/leandromoreira/ffmpeg-libav-tutorial#chapter-1---syncing-audio-and-video
There is well explained the PTS definition very very well. Used the
calculations from that readme and set this:
```
packet->pts = dvCodecCtx->time_base.den /
av_q2d(dvCodecCtx->framerate) * frameCounter++;
```
Now the input stream can restart, get wrong PTS, TS, whatever that
dont
broke my output stream timing.
Technically speaking that line is pure hack as it does use double
floating point precision for calculations when it is not really needed
to use and may after some relative long time give bad results.
On 1/2/23 16:39, Luis Felipe Domínguez Vega via Libav-user wrote:
> Hi, I'm trying to create in C a basic live transcoder that use my
> NVidia for hardware transcoding. I trying to set the decoded
frame PTS
> to my own because the source of the video is a UDP stream and
can be
> restarted. So i want manage by myself the PTS value to avoid a
restart
> of that value.
>
> Really i dont found a good documentation about to how manage and
> create from 0 that PTS value.
>
> Right now iw geting the frame from decoder, "modify ->pts", and
send
> to encoder, only for testing i get a variable with "frame" counter
> that start at 0, tested this:
>
> ```
> frame->pts = frameCounter++
> ```
>
> Of course this, after video encoder completed, drop so many
frames on
> the player (codec is h264 at input and output). So i think that
i dont
> geting the idea behind pts.
>
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