Fast decode h264 stream, keyframes only.

[Olivier Crête]

On Sat, 2017-03-11 at 19:44 +0000, Tim Müller wrote:
> On Sat, 2017-03-11 at 11:20 -0500, Nicolas Dufresne wrote:
> 
> > > Can gstreamer fast decode h264/5 steam and return only keyframes?
> > > That would be usefull for opencv processing  of live streams.
> > 
> > I believe this should work in recent version with the
> > GST_SEEK_FLAG_KEY_UNIT. Pause you streamr, and then operate a
> > flushing seek with this flag set.
> 
> You probably meant GST_SEEK_FLAG_TRICKMODE_KEY_UNITS ? :)
> 
> Question is, what does one do when seeking is not supported? In that
> case one would have to add a pad probe on the decoder sink pad or
> parser src pad or so and drop all frames that are flagged as delta
> units via the buffer flags or such.

You could also add the identity element before the decoder and set the
"drop-buffer-flags" property to GST_BUFFER_FLAG_DELTA_UNIT

-- 
Olivier Crête
olivier.crete at collabora.com