V4L2: Is it possible implement video composite with V4L2?

[Nicolas Dufresne]

Le lundi 31 août 2015 à 09:59 +0000, Bing Song a écrit :
> Forget add subdev link: 
> http://linuxtv.org/downloads/v4l-dvb-apis/subdev.html

Yes, this is at least how Hans V. handle these cases. If you are to use
GStreamer on top though with existing element (v4l2src/v4l2sink) you'd
have separate pipeline for sources, and sinks. A new element would have
to be written to actually make this compositor look like a single
element. That would only be required if your driver does not do any
synchronization.

Note though that if writing a driver is your goal, you should actually
post your questions to linux-media at vger.kernel.org . Even though we use
V4L2 in GStreamer, we are no expert in driver design, and subdev or
media controller architecture design.

Nicolas
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