I'm using an 8-channel PCI-based framegrabber on Nvidia TX1 dev kit. I'm using this driver along with it. I can play up to 3/4 v4l2 camera feeds comfortably using mplayer, streamer or VLC but I always get a memory allocation error when I start playing the 5th camera feed, irrespective of the software I use to play it. I also wrote my own program to capture and display v4l2 streams but I'm getting the same problem. The exact error is an error 12 given by the ioctl command:
ioctl(fd, VIDIOC_REQBUFS, &req)
I have tried this framegrabber and device on a standalone PC and it works perfectly fine.
Any suggestions would be helpful.
Got it running my changing the CONFIG_CMA_SIZE_MBYTES variable from 16 to 32 while building the kernel.