Multiple c920s on GStreamer 1.2.3

Olivier Crête olivier.crete at
Thu Feb 27 16:06:06 PST 2014


On Thu, 2014-02-27 at 16:20 -0500, Mark Scudder wrote:
> On Feb 27, 2014, at 4:15 PM, Alexandru Csete <oz9aec at> wrote:
> > You need to add an MP4 muxer if you want an MP4 file. Without the muxer you are just saving the raw h264 stream. The element mp4mux can probably do what you need.
> > 
> Thanks. I see some examples with h264parse before mp4mux in the pipeline. Is that necessary in this case? If so, why?

The h264parse is required there, the c920 produces byte-stream formatted
H.264 and you need to convert it to the AVC1 format for mp4mux.

> > This certainly sounds like a bug or limitation of the uvch264src, though I am not familiar with the internals. I hope somebody more qualified can comment on this.
> > 
> I hope somebody can. Anybody know about multiple uvch264src instances running on the same computer?

That definitely should work, please file a bug if it doesn't.

Olivier Crête
olivier.crete at

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