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<!--StartFragment--><p class="INDENT">Why doesn't vaapih264enc support rate-control-vbr on our Intel
Cherry Trail processor (see new information below re gstreamer-vaapi mods)<o:p class=""></o:p></p><p class="INDENT">I have tried similar pipelines in 1.14.1, 1.14.5, and 1.16.0.<o:p class=""></o:p></p><p class="INDENT"><br class=""></p><p class="INDENT">This pipeline works with rate-control=constant bitrate:<o:p class=""></o:p></p><p class="INDENT">gst-launch-1.0 -v videotestsrc num-buffers=1000 !
videoconvert ! vaapipostproc width=1280 height=720 ! vaapih264enc
rate-control=cbr bitrate=8000 ! mp4mux ! filesink location=video.mp4<o:p class=""></o:p></p><p class="INDENT"><br class=""></p><p class="INDENT">This pipeline fails with rate-control=variable bitrate:<o:p class=""></o:p></p><p class="INDENT">gst-launch-1.0 -v videotestsrc num-buffers=1000 ! videoconvert
! vaapipostproc width=1280 height=720 ! vaapih264enc rate-control=vbr
bitrate=8000 ! mp4mux ! filesink location=video.mp4<o:p class=""></o:p></p><p class="INDENT">ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data stream
error.<o:p class=""></o:p></p><p class="INDENT">streaming stopped, reason not-negotiated (-4)<o:p class=""></o:p></p><p class="INDENT">ERROR: pipeline doesn't want to preroll.<o:p class=""></o:p></p><p class="INDENT"><o:p class=""> </o:p></p><p class="INDENT">= = = UPDATE 7/30/2019 = = =<o:p class=""></o:p></p><p class="INDENT">The "Internal data stream error" problem can be
bypassed by a modification to gstvaapicontext.c in the function config_create()
of the gstreamer-vaapi code base. The fix is to remove the "goto cleanup;"
statement when the rate-control selection is excluded in this conditional:
"if ((value & va_rate_control) != va_rate_control) {"<o:p class=""></o:p></p><p class="INDENT">Now, I can process using "vaapih264enc bitrate=5000
rate-control=vbr" without error, but the controls such as changes in
bitrate do not affect output file size so I believe they are ignored.<o:p class=""></o:p></p><p class="INDENT">The reason for the conditional failing can be traced to
vaGetConfigAttributes() indicating support for only CBR 0x02 (constant-bitrate)
and CQP 0x10 (constant-quality). vaGetConfigAttributes comes from the core
VA-API library as documented here: <a href="http://intel.github.io/libva/group__api__core.html#gae51cad2e388d6cc63ce3d4221798f9fd" class="">http://intel.github.io/libva/group__api__core.html#gae51cad2e388d6cc63ce3d4221798f9fd</a>.
Therefore, I can't think of how to follow the trail any further. Please share
your ideas, knowledge, and experience.<o:p class=""></o:p></p>
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