Pi bcm2835-codec (bcm2835-v4l2) use of memory to memory (M2M) device /dev/video10

mpromonet / v4l2rtspserver

RTSP Server for V4L2 device capture supporting HEVC/H264/JPEG/VP8/VP9

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Pi bcm2835-codec (bcm2835-v4l2) use of memory to memory (M2M) device /dev/video10 #163

Closed Mingala closed 4 years ago

Mingala commented 4 years ago

In the new raspbian 4.19, the bcm2835-codec module loaded by default expose three v4l2 memory to memory (M2M) devices for the video decoder, encoder, and ISP resize respectively : /dev/video10, /dev/video11 and /dev/video12 (https://lb.raspberrypi.org/forums/viewtopic.php?f=43&t=62364&sid=307c744f6f3825158bd68b8cd08b6318&start=525). Is it possible to use the first directly with v4l2rtspserver command ? If so could you please be kind enough to provide a sample. Best Regards, Laurent.

mpromonet commented 4 years ago

Hi Laurent,

In the past I tried to find information about M2M and this new devices, but I found very few information, too few to try to implement interface with it.
I guess it should be possible to feed v4l2rtspserver with the output of an H264 or JPEG encoder. This probably need some extension of libv4l2cpp to access M2M device.

Best Regards, Michel.

Mingala commented 4 years ago

Hi Michel, Thanks for the quick comment. I will keep an eye on these new devices and watch uf any use through libv4l2cpp appears. Best Regards, Laurent.