GStreamer VA-API not displaying from cameras when they are set to H264 "Baseline" profile

[Nicolas Dufresne]

Le mardi 27 août 2019 à 07:53 +0000, Daniel Vernon a écrit :
> Hello,
>  
> Does anyone know if it's possible to get GStreamer VA-API decoding working with H264 Baseline profile?

VA-API only support constrained-baseline. If your stream was
accidentally marked as baseline while being constrained, I made a patch
to allow this, but we haven't decided if we are to upstream it.

https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/merge_requests/118


>  
> Here is the problem we have:-
>  
> We are using GStreamer with VA-API elements under Ubuntu 18.04.2 LTS to display H264 from a selection of IP cameras.  When the cameras are set to H264 Main Profile, GStreamer displays fine.  But when we change the cameras to H264 Baseline Profile, we get no display.
>  
> We have tested with three different makes of camera so far (an Axis, DynaColor and Sunell) and all with the same result.
>  
> This gst-launch example shows the pipeline we are using:-
>  
>                 gst-launch-1.0 rtspsrc location=rtsp://192.168.80.217/h264 ! rtph264depay ! vaapidecodebin ! ximagesink
>  
>  
> Note that if we replace “vaapidecodebin” with “avdec_h264” in the above, this works fine with H264 Baseline.  But we'd much rather use VA-API (to take advantage of hardware decode and thus reduce the system's CPU load).
>  
> By running command 'vainfo', we see that it lists H264 profiles "ConstrainedBaseline", "Main" and "High".  Does this mean that VA-API is deliberately not supporting H264 Baseline, or could it have a fault?
>  
>  
> If anyone can help with this problem or has more information this would be much appreciated.
>  
> Thanks,
>  
> Daniel Vernon
>  
>  
> Daniel Vernon
> Development Engineer
>  
> 
>  
> 
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