Cannot play a 4K mkv content with v4l2h265dec plugin

karimchtx karim_atiki at
Mon Mar 22 19:34:43 UTC 2021

Hi Nicolas,

Thanks for your quick reply.
You're definitly right in your analysis.
A couple hours after my posts, I've slightly changed my pipeline as

 gst-launch-1.0 -v filesrc location=/media/sda1/solo.mkv  ! video/x-matroska
! aiurdemux  ! h265parse ! v4l2h265dec !  imxvideoconvert_g2d ! ! queue !

You were right, I needed an explicit plugin before waylandsink for the

at first sight, it works.
But the video is sometime freezing during many seconds...(but gstreamer
doesn't crash).
Regarding the CPU, the vpu is effectively working.
I can't figure out how to explain the "freezing" sequences.

I tried to play the same media within souphttpsrc, it's working as well but
the playback is still stuttering in "fast sequences" of the movie.

And finally, I just can't figure ou what's happening and how could I debug /
monitor the plugins task.

Any suggestion would be welcome.

Best Regards,


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