[FFmpeg-devel] A change in r_frame_rate values after upgrade to FFmpeg 6.1

[Kieran Kunhya]

On Mon, Sep 23, 2024 at 3:27 PM Anton Khirnov <anton at khirnov.net> wrote:
>
> Quoting Antoni Bizoń (2024-09-23 10:09:51)
> > I understand that the r_frame_rate is the lowest framerate with which
> > all timestamps can be represented accurately. And I know it is just a
> > guess. But why did the logic behind the calculation change?
>
> Because you're most likely using a codec like H.264 or MPEG-2 that
> allows individually coded fields. In that case the timebase must be
> accurate enough to represent the field rate (i.e. double the frame
> rate), but the code doing this was previously unreliable, so you'd
> sometimes get r_frame_rate equal to the frame rate rather than field
> rate. That is not the case anymore.

This is bizarre and kafkaesque to say the least.

Kieran