[08:23] <Gekko> I'm looking at a sensor that's advertised to provide 1280 x 720 video at 30 FPS, but I'm getting about 10 FPS in that mode with mplayer as well as my own code using the V4L api. Profiling my code shows the slowdown is in select() waiting for the file descriptors to have data in them. I've tried increasing the VIDIOC_REQBUFS count higher but it doesn't appear to do anything. This is a beefy
[08:23] <Gekko> machine and CPU usage hardly increases at all according to top.
[08:23] <Gekko> It's a USB2 camera. I've tried in USB2 and USB3
[08:23] <Gekko> and the only other USB stuff I have connected is mouse + keyboard
[08:24] <Gekko> Before I go ahead and blame the company for falsely advertising their framerates, is there something I should look into in the V4L API to possibly increase the framerate?
[08:25] <Gekko> For the record I get 1920 x 1080 video feed from a Kinect 2 at 30 FPS
[08:25] <Gekko> But it's not over UVC
[08:25] <Gekko> This sensor does provide stable 30 FPS if I reduce the resolution to 640 x 480
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[08:57] <Gekko> this is my minimal code https://github.com/SirDifferential/minimal_uvc_read
[09:10] <Gekko> This would be the line where the wait is https://github.com/SirDifferential/minimal_uvc_read/blob/master/uvc_linux.cpp#L592
[10:31] <kbingham[m]> Gekko: Have you tried using guvcview or something to adjust the controls and see what the driver is exposing? For example - it might support 720@30FPS in MJPEG, but not the raw formats.
[10:39] <Gekko> hah, kbingham[m], that was it!
[10:40] <Gekko> mjpeg is 30 FPS
[11:46] <kbingham[m]> Gekko: Excellent :-) Glad I could help!
[11:50] <Gekko> There
[11:50] <Gekko> added turbojpeg there
[11:50] <Gekko> Now I get a smooth as baby's butt 30 FPS
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