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<p class="MsoNormal">Partially answering my own question…<o:p></o:p></p>
<p class="MsoNormal">I see that when I built gstreamer-vaapi v1.14.2 module from source that the “DRM backend” is enabled by default “—enable-drm=yes” but from my configure log I see that checking for DRM failed: “checking for DRM... no”.<o:p></o:p></p>
<p class="MsoNormal">The configuration summary at the end of my configure output shows only “x11 glx egl wayland” in the “Video outputs” section.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So I’m missing some dependency for building the gstreamer-vaapi v1.14.2 module with DRM.<o:p></o:p></p>
<p class="MsoNormal"> DRM: libva-dev (>= 1.1.0), libdrm-dev, libudev-dev<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve now tested by having libdrm-dev & libudev-dev installed before my build and this has provided the DRM Video output.<o:p></o:p></p>
<p class="MsoNormal">I still don’t know how to select it at run time!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-AU">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-AU"> Matthew Thyer
<br>
<b>Sent:</b> Friday, 14 September 2018 3:30 PM<br>
<b>To:</b> 'Discussion of the development of and with GStreamer' <gstreamer-devel@lists.freedesktop.org><br>
<b>Subject:</b> Headless VA-API hardware accelerated H.264 video encoding with vaapih264enc?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The Libav Wiki "Hardware/vaapi" page (<a href="https://wiki.libav.org/Hardware/vaapi">https://wiki.libav.org/Hardware/vaapi</a>) states that I should be able to use VA-API hardware acceleration without being connected to an X server.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Quote:<o:p></o:p></p>
<p class="MsoNormal">"The libva driver needs to be attached to a DRM device to work. This can be connected either directly or via a running X server. When working standalone, it is generally best to use a DRM render node (/dev/dri/render*); only use a connection
via X if you actually want to deal with surfaces inside X (with DRI2, for example)."<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It then gives an example on how to use the DRI rendering device directly with the "avconv" utility:<o:p></o:p></p>
<p class="MsoNormal">avconv -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -i ...<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What's the equivalent for the vaapih264enc GStreamer element?<o:p></o:p></p>
<p class="MsoNormal">i.e., How do I make it use the DRM device /dev/dri/renderD128 instead of the X server?<o:p></o:p></p>
<p class="MsoNormal">I can't see any properties of the element that allow me to control this.<o:p></o:p></p>
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