Variable framerate/fps input video encoding questions

Nicolas Dufresne nicolas at
Sat Jul 20 01:15:54 UTC 2019

Le ven. 19 juill. 2019 09 h 55, jles <jlesquer at> a écrit :

> Nicolas Dufresne-5 wrote
> > This looks like buffering effect, just like cars on the high way. They
> > just bump into each other running slower and out of a sudden everyone
> > tries to catch up the lost time.
> I see, do you have any idea about why could this be happening? have you
> seen
> this before with gstreamer live stream pipelines?
> The code is really simple, grab a frame from camera and push it to the
> pipeline each time, gstreamer it is quite high level of abstraction to see
> clearly where could it be the issue...could you please point me to right
> direction?
> I saw the debugging options using the gstreamer plugin (exporting env.
> variables as export GST_DEBUG="*:6") but no sure  how to do it with code?

GST_SCHEDULING:5 might be handy. It will trace all buffers flowing and
their timestamps. Sources like v4l2src make use of the timestamps provided
by the kernel, that usually prevents jitter like this.

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