shmsink/shmsrc adds colored band to output

[Mandar Joshi]

> You can narrow down a bit. Replaced xvimagesink to ximagesink, that
> would indicate a bug in your XV driver. Solution would be to update
> your X11 drivers, or file a bug if there is no newer version that fixes
> it.
Using ximagesink doesn't solve the problem.

> You could also test replacing vaapidecodebin with avdec_h264, that
> would indicate an issue with usage of vaapidecodebin.
>
avdec_h264 produces a clean image.


The problem only occurs when I use shmsink/shmsrc. Directly decoding
the video stream coming from the camera and displaying it using
xvimagesink doesn't produce the colored band.