Green artefact on imx6 with zero copy

[Damien Dejean]

Hi Audric,

We've got a similar problem with imxvpudec/imxeglvivsink with the same platform, the same kernel, the same version of GStreamer but on Android. For us, the bug appeared only when decoding/displaying videos with width and/or height not multiple of 16 pixels.

Here is the bug we opened: https://github.com/Freescale/gstreamer-imx/issues/90, from the test we did (with another gstreamer version, a newer kernel, updates plugins) we failed to fix it. Nevertheless the maintainer failed to reproduce its linux platform. We deduced it was a VPU and/or GPU/EGL bug.

If you found any similarity or need more info, do not hesitate.

BR,

Damien;

Le 03/30/2016 10:52 AM, Audric Ackermann a écrit :
> Hi,
> 
> I am trying to play an h264 rtp stream to a gles2 texture on imx6 using an appsink and vivante map feature (zero copy).
> I am using gstreamer-imx 0.12.0, gstreamer 1.4.5 and kernel version 3.0.35.
> 
> I am able to play the stream using an imxeglvivsink like this:
> 
> udpsrc port=5001 name=udpsrc caps=\"application/x-rtp,pt=96,encoding-name=H264,framerate=(fraction)30/1 \" ! rtph264depay ! h264parse config-interval=1 ! imxvpudec ! imxipuvideotransform ! video/x-raw,format=UYVY ! imxeglvivsink
> 
> 
> But for some reason, when I use my appsink and feed my texture with my buffer phys address via glTexDirectVivMap, I get sometimes green artefacts.
> Sometimes it is the whole picture which is green, and only "key frames" are correct, sometimes it is only the bottom of the video (like 100 pixels) which are green.
> 
> The strange thing is it happens to work quiet good for a while, and then (often after reboot) I will get those artefacts.
> 
> I have used the imxeglvivsink as a template to build my appsink. It's not complicated at all, just receiving buffers in a thread, saving them with mutex lock, and in the render thread access these buffers with lock and get phys mem adress to display them with TexDirectVivMap.
> 
> 
> I would like to remove the imxipuvideotransform but I get then get this issue: https://github.com/Freescale/gstreamer-imx/issues/91 <https://github.com/Freescale/gstreamer-imx/issues/91>
> 
> 
> I am out of ideas about where this can come from.
> Any ideas where I should look ?
> 
> Cheers,
> Audric Ackermann
> 
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