[Libav-user] AVFrame pts and av_usleep funciton.

[Paul B Mahol]

On Mon, Aug 21, 2023 at 10:30 AM Denis Gottardello <info at denisgottardello.it>
wrote:

>
> In order to implement a sleep function and wait the right time to display
> a frame I have written this code:
>
> int framerate= pAVCodecContextVideo->framerate.num /
> pAVCodecContextVideo->framerate.den;
>
> if (previous!= 0) {
>
>     av_usleep((pAVFrame->pts - previous) / framerate);
>
> }
>
> previous= pAVFrame->pts;
>
> but the value passed to av_usleep() is wrong.
>
> How have I to calculate it?
>

If you really want to do it that way you need to use floating point
calculations, or use fixed point arithmetic (av_rescale*)
to convert seconds to microseconds.


>
> Best regards.
>
>
> --
>
> +39.347.4070897
>
> http://www.labcsp.com
>
> http://www.denisgottardello.it
>
> GMT+1
>
> Skype: mrdebug
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