kmssink: Renders at half my display refresh rate
Submitted by Nicolas Dufresne @ndufresne
Link to original bug (#793339)
Description
While doing some latency test, I notice that kmssink renders at half the speed of my display. My test pipeline was:
gst-launch-1.0 -v videotestsrc ! video/x-raw,framerate=60/1 ! fpsdisplaysink text-overlay=0 video-sink=kmssink
Commenting out the code that (according to comment) tries to wait for previous frame to finish fixes it.
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/sys/kms/gstkmssink.c#n1499
My impression is that we endup waiting for an extra vblank all the time as the previous blank is behind.