[05:50] <theelder777> Hello. Can I use v4l drivers (in kernel space) to "deal" with a video capture device that takes hdmi input and outputs h264 that is then mpeg2ts? I apologize if my answer is invalid or vague.
[05:51] <theelder777> *if my question
[09:17] <mchehab> theelder777: yes, it is a valid usecase
[10:28] <vianpl> I've been working on a small v4l2 driver that pipes input from a frame buffer device into a video capture device. I use it to test a fb based application locally and will probably use it to stream it using gstreamer. It's pretty much a hack, but I still wanted to check with you if there would be any interest for it. I'd be glad to send an RFC patch or whatever. The code is here https://github.com/vianpl/fbsrc.
[10:57] <mort> hey, I have a v4l2_buffer called buffer. buffer.type is V4L2_BUF_TYPE_CAPTURE_MPLANE, buffer.memory is V4L2_MEMORY_MMAP, buffer.index is 0. `ioctl(fd, VIDIO_QUERYBUF, &buffer)` returns <0 and errno is set to EINVAL.
[10:57] <mort> What am I doing wrong?
[10:58] <mort> I'm not that comfortable with v4l2, I'm trying to adapt something made for non-mplane video devices to work with mplane devices
[11:10] <sailus> mort: have you set the rest of the fields zero?
[11:10] <mort> yes, it does a `memset(&buffer, 0, sieof(buffer))` before setting any fields
[11:12] <hverkuil> mort: enable vb2 debugging: echo 1 >/sys/modules/videobuf2_core/parameters/debug
[11:13] <hverkuil> (from memory, the path may not be 100% correct)
[11:13] <snawrocki> mort: is buffer.m.planes initialized? and buffer.length should be set to a value equal to number of planes
[11:13] <hverkuil> vb2 has decent debug messages, should help pinpointing the problem
[11:15] <mort> m.planes is not initialized
[11:16] <mort> nor is length
[11:16] <mort> that's probably the issue then
[11:16] <mort> where does debug output go?
[11:18] <snawrocki> into the kernel log
[11:21] <mort> that log only says: [   55.612644] vb2-core: __vb2_queue_alloc: allocated 4 buffers, 1 plane(s) each
[11:44] *** hverkuil has left 
[11:55] <snawrocki> mort: you can try higher videbuf2 debug level, e.g. 3
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