How to decode rtsp video stream of h265 in opencv python

[mozeqiu]

I will use opencv python in Ubuntu 20.04. My ffmpeg can decode the h265 video stream. How do I decode the h265 video stream in python code to play it

[asmorkalov]

OpenCV does not implement codecs by itself, but uses some other library as a backend, e.g. FFmpeg. I'm checking if FFmpeg build distributed with OpenCV has HEVC decoder enabled.

[asmorkalov]

The FFmpeg version that is distributed with OpenCV-Python supports hevc. It's in list of supported codecs. Could you provide more information about the stream? We are looking on FFmpeg update for the next release as option.

[mozeqiu]

The FFmpeg version that is distributed with OpenCV-Python supports hevc. It's in list of supported codecs. Could you provide more information about the stream? We are looking on FFmpeg update for the next release as option.

I use the rtsp h265 code stream of the webcam, the codec: MPEG-H part2/HEVC (h265) (hevc), and the resolution: 1280 * 720.I want to implement this decoding on the arm board

[Smikha]

The FFmpeg version that is distributed with OpenCV-Python supports hevc. It's in list of supported codecs. Could you provide more information about the stream? We are looking on FFmpeg update for the next release as option.

I use the rtsp h265 code stream of the webcam, the codec: MPEG-H part2/HEVC (h265) (hevc), and the resolution: 1280 * 720.I want to implement this decoding on the arm board

I don't believe you'll need to specify anything for h265 in python when using opencv - but rather will have to set it up in your camera for the appropriate stream. If using gstreamer or other tools, I believe you have to specify the codec.

In python, you can do the following:

def capture_h265_stream():
    image_filename = 'test_file'
    camera_username = 'test_user'
    camera_password = 'test_pw'
    camera_ip = '192.168.0.50'
    
    cap = cv2.VideoCapture(f'rtsp://{camera_username}:{camera_password}@{camera_ip}/streamX')

    while cap.isOpened():
        ret, frame = cap.read()
        if frame is not None:
            cv2.imwrite(f"{image_filename}.png", frame)
        break

    cap.release()
    return frame