GPU Sample for VideoReader not working

[cudawarped]

@alex

However, the video capture card and webcam do not work, as described above.

Sorry I missed that I thought by

@alex

The error occurs with any video source! I’ve tried a video capture card, I’ve also tried Webcams.

you meant all video source (i.e. files, rtsp sources etc.) including webcams and usb.

You can’t use VideoReader unless you can use the CAP_FFMPEG backend to read from your source as VideoReader parses the video source using VideoCapture with the FFmpeg backend. Therefore without modification VideoReader will not work on hardware video sources (capture cards, usb or inbuilt webcams).

I tried to help @data with this but we didn’t get very far. In windows you can build the FFmpeg backend to use hardware devices so I had hoped you could do the same with v42l. Anyway you can try the suggestions in

Not able to read Video from Capture Card with GPU (Unsupported Format) while Reading with CPU works fine

Hello all, First of all, i am new to the Open CV World and just started a few weeks ago. I tried to solve this error by reading questions to similar problems, but until now, i couldn’t fix it. Context: I am working with a stereo webcam, which has two HDMI video signals as output. These signals are captured by a Video Capture Card (see Hardware). I am trying to access one (for now at least) of the input signals with Open CV. When using the Open CV examples from GitHub, the video signal can be…

which is essentially build OpenCV against libavdevice and include avdevice_register_all() in void CvCapture_FFMPEG::init() and set OPENCV_FFMPEG_CAPTURE_OPTIONS=input_format;v42l. I have no idea if this will work and don’t have time to test as I’m working on windows at the moment.