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

Tue Aug 27 07:53:53 UTC 2019

Hello,

Does anyone know if it's possible to get GStreamer VA-API decoding working with H264 Baseline profile?

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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