Camera stuck in FullHD mode

[afdaniele]

Hi, I'm having a hard time getting the camera to use a different sensor mode. The camera seems to be switching mode but always returning image with resolution 1920x1080, regardless of what I pass to the sensor-mode argument.

If I run the following pipeline, I get the correct image

gst-launch-1.0 rpicamsrc sensor-mode=1920x1080 ! video/x-raw, width=1920, height=1080, format=RGB ! jpegenc snapshot=TRUE ! filesink location=image.jpg

Though, if I try to select the sensor mode 1296x972 with the following pipeline, this is what I get

gst-launch-1.0 rpicamsrc sensor-mode=1296x972 ! video/x-raw, width=1296, height=972, format=RGB ! jpegenc snapshot=TRUE ! filesink location=image.jpg

Now, if I mix things up, so choose the sensor mode 1296x972 but don't specify the resolution, I get the following image, which is (visibly) correct, has a wider field-of-view (as expected given that the mode 1296x972 has a wider field-of-view compared to 1920x1080) but the size of the image is still 1920x1080.

gst-launch-1.0 rpicamsrc sensor-mode=1296x972 ! video/x-raw, format=RGB ! jpegenc snapshot=TRUE ! filesink location=image.jpg

The artifacts look like they come from a rowbyte/stride problem.
Any idea what the cause could be?

My environment:

• rpicamsrc built from source, commit: f6b5762
• Ubuntu 20.04 (arm64)
• Raspberry Pi 4B 4GB
• Raspberry Pi camera V1
• Gstreamer 1.16.2

[thaytan]

I haven't tried the raw image output mode for a long time - I normally use h264 or jpeg capture, because the transfer from the VPU to CPU is inefficient for raw frames and limits you to just a couple of FPS. If your goal is to record jpeg files, you should let the VPU do that encoding:

gst-launch-1.0 rpicamsrc sensor-mode=1296x972 num-buffers=1 ! image/jpeg ! filesink location=image.jpg

The stride problem is definitely a bug though.

I think the output size choice is something to improve, but not necessarily a bug. The output resolution is negotiated independently of the capture resolution. If you add the resolution to the output capsfilter it should do what you want:

gst-launch-1.0 rpicamsrc sensor-mode=1296x972 ! video/x-raw, format=RGB,width=1296,height=972 ! jpegenc snapshot=TRUE ! filesink location=image.jpg