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   hverkuil: <u>pH5</u>: ping
   pH5: <u>hverkuil</u>: pong
   hverkuil: <u>pH5</u>: Am I right that these two patches can be marked superseded? https://patchwork.linuxtv.org/patch/58580/ https://patchwork.linuxtv.org/patch/58581/
   pH5: <u>hverkuil</u>: yes, it appears the second patch is incorrect, and the first one is unnecessary.
   hverkuil: OK, I'll mark them as such.
   <br> <u>pH5</u>: https://patchwork.linuxtv.org/patch/58590/ is basically the follow-up patch, right?
   pH5: <u>hverkuil</u>: yes, exactly.
   jernej: <u>hverkuil</u>: how can I reuse capture buffer from one v4l2 m2m driver as output buffer in another v4l2 m2m buffer?
   <br> use case: Cedrus driver produces interlaced frame and I want to feed it directly to deinterlace driver without copying
   hverkuil: On one device you use MEMORY_MMAP, then export the buffers as dmabufs (VIDIOC_EXPBUF). On the other device you use MEMORY_DMABUF and pass the exported dmabuf fds.
   <br> Which device is used to export and which to import is up to userspace.
   <br> it doesn't matter if both sides have the same alignment etc. requirements. If there are differences, then the one with the strictest requirements should use MMAP/EXPBUF.
   <br> Sadly, it's trial and error to discover this AFAIK.
   jernej: ok, thanks
   <br> I think there is no special alignment requirements for my use case
   hverkuil: which deinterlace driver do you want to use?
   jernej: the one I wrote and I'll send it to media ML soon :)
   <br> but here it is: https://github.com/jernejsk/linux-1/blob/deint/drivers/media/platform/sunxi/sun8i-di/sun8i-di.c
   <br> it works nicely with v4l2-ctl
   hverkuil: Ah, that one! :-)
   jernej: current plan is to add support for v4l2 m2m deinterlace drivers as a filter to ffmpeg
   <br> I imagine this could be troublesome