https://bugs.freedesktop.org/show_bug.cgi?id=101787
--- Comment #2 from Julien Isorce julien.isorce@gmail.com --- Can you attach output of dmesg as suggested by the error message (and the dmesg output just after boot) and also output when setting GST_DEBUG=6 Does it work with older fedora/mesa/kernel (i.e. regression) ?
You can try to compare with:
gst-launch-1.0 filesrc location=test.mp4 ! qtdemux ! h264parse ! vaapih264dec ! capsfilter caps="video/x-raw(memory:VASurface)" ! vaapih264enc ! qtmux ! filesink location=res.mp4