Hi Fabio, On Mon, 2021-01-18 at 15:36 -0300, Fabio Estevam wrote: > Hi Philipp, > > On Mon, Jan 18, 2021 at 12:29 PM Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> wrote: > > > Please try forcing decoder output to NV12 instead of I420. > > Your suggestion works, thank you. After applying your IPU patch and > using this Gstreamer pipeline: > > gst-launch-1.0 filesrc location=/media/clip.mp4 ! qtdemux ! h264parse > ! v4l2h264dec ! video/x-raw,format=NV12 ! kmssink > > The video is played with correct colors. Ok, thank you. It looks to me like the I420 issue is either a bug in coda-dev, or an interaction issue between GStreamer and coda-dev, where coda-dev doesn't let GStreamer change the format at a point where it expects to be able to. The b/w image (with slight discolorations in a regular pattern) could very well be actual NV12 interpreted as I420 by GStreamer (and thus kmssink). I'll have closer look. > Can we make the NV12 format be used automatically so that a simple > 'gst-play-1.0 /media/clip.mp4' works? That would be a matter of increasing the rank of the NV12 format in gst_v4l2_object_format_get_rank() above that of I420 and YV12. > > Yes. Please try if the following patch makes it work: > > With this Gstreamer patch, I don't see the segfault anymore, but it > plays in black-and-white. Thanks for testing. I've opened https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/856 to track this. regards Philipp
