Opening a GStreamer pipeline from OpenCV with VideoWriter

Question

I am capturing and processing video frames with OpenCV, and I would like to write them as a h265 video file. I am struggling to get a proper Gstreamer pipeline to work from

Answer 1

I encountered a similar problem before. Since the pipe/file name ends with .mkv, OpenCV interprets it as a video file instead of a pipe.

You can try ending it with a dummy spacing like after mkv

video.open("appsrc ! autovideoconvert ! omxh265enc ! matroskamux ! filesink location=test.mkv ", 0, (double)25, cv::Size(1024, 1024), true);

or with a dummy property like

video.open("appsrc ! autovideoconvert ! omxh265enc ! matroskamux ! filesink location=test.mkv sync=false", 0, (double)25, cv::Size(1024, 1024), true);