https://bugs.freedesktop.org/show_bug.cgi?id=101787
--- Comment #7 from Julien Isorce julien.isorce@gmail.com --- Thx for the logs but I do not see anything that could be associated to "radeon: The kernel rejected CS, see dmesg for more information (-22)" in the first dmesg attached.
Also about GST_DEBUG=6, do: GST_DEBUG=6 transmageddon &> gst_debug.log then do trigger the transcoding that generates the error above.