Libcamera failed to get frames from OV9281 camera about libcamera HOT 8 CLOSED

In order to get high framerate i use the inno-maker driver :

Sorry, we only support the driver shipped as part of our kernel.

What high frame rate mode are you after? The standard kernel driver supports

• 10 bit output at 1280x800@120fps, 1280x720@144fps, 640x400@260fps
• 8 bit output at 1280x800@150fps, 1280x720@180fps, and 640x400@320fps.
  Those are well up into H264 level 4.2, so performance is not guaranteed.

from libcamera.

Thank you for your answser.

1. I understand that you don't support innomaker's driver but, since VLC could get the camera stream by using ATSC 8-VSB (with innomaker's driver), Don't you think that libcamera (or Picamera2) could do it too ?

What high frame rate mode are you after? The standard kernel driver supports

10 bit output at 1280x800@120fps, 1280x720@144fps, 640x400@260fps
8 bit output at 1280x800@150fps, 1280x720@180fps, and 640x400@320fps.
Those are well up into H264 level 4.2, so performance is not guaranteed.

Since i am newbie to vision development, do you have samples using Picamera2 in order to get 10bit output 640x400@260fps or 8bit 640x400@320fps ?
Thank you

from libcamera.

If v4l2-ctl and VLC are getting frames without manual media-ctl commands, then the Media Controller API is not enabled for the driver. libcamera requires Media Controller - https://forums.raspberrypi.com/viewtopic.php?t=322076

@davidplowman can you advise on Picamera2
I'm using libcamera-vid --width 640 --height 400 --framerate 240 --denoise off -o foo.h264 --save-pts foo.pts
For some reason 250fps stalls after a few seconds. 259fps drops into repeated timeouts. 260fps just stalls. Using v4l2-ctl it seems to stream fine at those rates.

from libcamera.

Ok thank you @6by9 for your assistance ... i wait for Picamera2 advices (@davidplowman) :-)

from libcamera.

Picamera2 works if and only if libcamera works. So you will need a compatible driver that supports these framerates. Note that these are quite high framerates so you would have to experiment to find out what is achievable in practice.

from libcamera.

Thank you for your advices

from libcamera.

@davidplowman libcamera-vid --width 640 --height 400 --framerate 240 --denoise off -o foo.h264 --save-pts foo.pts does work with our standard driver to give 240fps captures with the odd frame drop, I just don't know the right runes to convert that to picamera2.

from libcamera.

Sure, the basic recipe for capturing video is here.

In this particular case, controls would be needed to set the framerate and turn off the noise reduction. These are listed in Appendix C of the manual (FrameDurationLimits and NoiseReductionMode).

For very high framerates, libcamera-vid might offer slightly fewer frame drops, but it's hard to know without trying it.

from libcamera.