Re: Webcam live streaming on a DLNA TV?

[Jens Georg <mail jensge org>]

> I tested several profile names according to what i read in
> /usr/share/gupnp-dlna-2.0/dlna-profiles/*.xml (without a clear
> understanding of what does those profiles refers to ;( )

EU and NA differ in FPS and resolution (25 vs 24 fps, 400 vs 388 lines 
etc.)
> webcam-dlnaprofile=MPEG_TS_SD_EU_ISO
> webcam-dlnaprofile=MPEG_TS_SD_NA_ISO

and that one obviously has a higher resolution (IIRC 720p)
> webcam-dlnaprofile=MPEG_TS_HD_NA_ISO

That's the wrong codec (MPEG1, not MPEG2 or h.264):

> webcam-dlnaprofile=MPEG1

Those are the wrong container (DVD-like instead of TS):

> webcam-dlnaprofile=MPEG_PS_PAL
> webcam-dlnaprofile=MPEG_PS_NTSC
>
> unfortunately without success (not a big surprise ;) )
>
>
> I get this error message:
> (rygel:14797): MediaEngine-GStreamer-CRITICAL **: 16:59:42.042: Error
> from pipeline RygelGstDataSource: gstbasesrc.c(3055): gst_base_src_loop
> (): /GstPipeline:RygelGstDataSource/GstBin:bin1/GstV4l2Src:v4l2src1:
> streaming stopped, reason not-negotiated (-4)
>
> Does this means that gstreamer is expecting some kind of "negotiation"
> from the TV? or Rygel?

The good news is: The original problem is fixed - The TV is accepting 
the file and triggering the playback, but the internal GStreamer 
workings then fail. It looks like the output of v4l2src, when using the 
default settings, is not compatible to what avenc_mpeg2video expects.

I would suggest that you try to build a pipeline that captures from your 
webcam with gst-lauch-1.0 to mpeg. Once that works, you can move to 
Rygel again. The easiest fix might be to throw in a videoconvert element 
between the src and the avenc. It might even be that your cam outputs 
h264 directly which you could wrap into MPEG-TS without encoding.