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• Efficient real-time video stream processing and forwarding with RTMP servers

  19 mai 2023, par dumbQuestions

  I have a scenario where I need to retrieve a video stream from an RTMP server, apply image processing (specifically, adding blur to frames), and then forward the processed stream to another RTMP server (in this case, Twitch).

  


  Currently, I'm using ffmpeg in conjunction with cv2 to retrieve and process the stream. However, this approach introduces significant lag when applying the blur. I'm seeking an alternative method that can achieve the desired result more efficiently. I did attempt to solely rely on ffmpeg for the entire process, but I couldn't find a way to selectively process frames based on a given condition and subsequently transmit only those processed frames.

  


  Is there a more efficient approach or alternative solution that can address this issue and enable real-time video stream processing with minimal lag ?

  


  Thanks in advance !

  


  def forward_stream(server_url, stream_key, twitch_stream_key):
    get_ffmpeg_command = [...]

    send_ffmpeg_command [...]

    # Start get FFmpeg process
    read_process = subprocess.Popen(get_ffmpeg_command, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)

    # Start send FFmpeg process
    send_process = send_process = subprocess.Popen(send_ffmpeg_command, stdin=subprocess.PIPE, stderr=subprocess.DEVNULL)

    # Open video capture
    cap = cv2.VideoCapture(f'{server_url}')

    while True:
        # Read the frame
        ret, frame = cap.read()
        if ret:
            # Apply machine learning algorithm
            should_blur = machine_learning_algorithm(frame)

            # Apply blur if necessary
            if machine_learning_algorithm(frame):
                frame = cv2.blur(frame, (25, 25))

            # Write the frame to FFmpeg process
            send_process.stdin.write(frame.tobytes())
        else:
            break

    # Release resources
    cap.release()
    read_process.stdin.close()
    read_process.wait()



  


• Remove everything before a string with bash ?

  11 décembre 2017, par petaire

  I’m doing this with ffmpeg :

  ffmpeg -i /Users/petaire/GDrive/Taff/ASI/Bash/testFolder/SilenceAndBlack.mp4 -af silencedetect=d=2 -f null - 2>&1 | grep silence_duration

  And my output is :

  [silencedetect @ 0x7f9e6940eba0] silence_end: 25.92 | silence_duration: 25.936

  But I only want to keep the duration number, so I’m trying to remove everything before the last number.

  I’ve never understood anything about sed/awk & co, so I dont know what is the best way to do that. I thought grep would be powerful enough, but it doesn’t seems so.

  Any idea ?

• segment : Add an option to prepend a string to the list entries

  18 mars 2014, par Enrique Arizón Benito

  segment : Add an option to prepend a string to the list entries
  Useful to generate lists with absolute urls.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/segment.c