Jetson_Commands.txt

https://github.com/jschmid1/gopro_as_webcam_on_linux
For starting the gopro:
sudo gopro webcam

For streaming output to /dev/video42 :
ffmpeg -nostdin -i 'udp://@0.0.0.0:8554?overrun_nonfatal=1&fifo_size=50000000' -vf setpts=0.9*PTS -flags low_delay  -f:v mpegts -fflags nobuffer -vf format=yuv420p -f v4l2 /dev/video42

For launching gstreamer view:
gst-launch-1.0 v4l2src device=/dev/video42 ! video/x-raw, width=1920, height=1080, framerate=30/1 ! xvimagesink

https://www.youtube.com/watch?v=rs4mQcJAjMM
https://github.com/jetsonhacks/camera-caps
For running python script:
python3 camera_caps.py

  File "detect.py", line 108
    txt_path = str(save_dir / 'labels' / p.stem) + ('' if dataset.mode == 'image' else f'_{frame}')  # img.txt
                                                                                                 ^
SyntaxError: invalid syntax

def take_photo(filename='photo.jpg', quality=0.8, delay=2):
    start_time = time.time()
    # Display video stream
    js = Javascript('''
        (async () => {
            const video = document.createElement('video');
            video.style.display = 'block';
            const stream = await navigator.mediaDevices.getUserMedia({video: true});
            document.body.appendChild(video);
            video.srcObject = stream;
            await video.play();
            // Wait for the video to start streaming
            await new Promise(resolve => video.onplaying = resolve);
            // Capture a frame after delay
            await new Promise(resolve => setTimeout(resolve, 1000));
            const canvas = document.createElement('canvas');
            canvas.width = video.videoWidth;
            canvas.height = video.videoHeight;
            canvas.getContext('2d').drawImage(video, 0, 0);
            stream.getVideoTracks()[0].stop();
            // Convert the canvas to base64 encoded image
            const imgData = canvas.toDataURL('image/jpeg', 0.8);
            google.colab.kernel.invokeFunction('notebook.take_photo', [imgData], {});
        })();
        ''')
    display(js)
    # Callback function to receive image data
    def take_photo_callback(imgData):
        binary = base64.b64decode(imgData.split(',')[1])
        img = Image.open(io.BytesIO(binary))
        img.save(filename, 'JPEG')
        end_time = time.time()
        print(f'Photo taken and saved as {filename}. Time taken: {end_time - start_time:.2f} seconds.')
    # Register the callback function
    output.register_callback('notebook.take_photo', take_photo_callback)