[FFmpeg-user] Why does fps == 1 for a webm videos?

[Misha Penkov]

On 22 March 2013 00:02, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Misha Penkov <misha.penkov <at> gmail.com> writes:
>
> > Unfortunately, my use case actually is to output raw video.
> > I'm passing it into an in-house application that that only
> > accepts raw video. The app performs shot segmentation, so
> > it needs to be accurate about frame numbers.
>
> How does your application deal with variable frame rate /
> how does it know the framerate of your yuv file?
>

The application is frame-rate agnostic.  It examines adjacent frames to
detect shot boundaries, and keeps track of the shot boundaries using the
frame numbers.  This is why I need frame numbers between the webm and the
YUV to match: if they don't, I won't be able to seek to the shot boundaries
in the webm file accurately.


> > It seems that -vsync 0 fixes the problem of duplicate frames.
> > Could it cause the frame numbers in the YUV and webm files
> > to no longer match up?
>
> It on the contrary guarantees that every input frame matches one
> output frame (no matter the timestamp).
>

That's exactly what I needed.  Thank you for your help.

>