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• Python Flask : Saving live stream video to a file periodically

  25 juillet 2023, par Sanjay Shahi

  I am creating a flask application with JavaScript to save the live video streams to a file.

  


  What I am trying to achieve here is that, the video stream will be sent to flask application periodically (20 secs). The first time it will create a video and after that, the video needs to be merged to the existing file.

  


  I am using SocketIO to transmit the video from JS.

  


  `async function startCapture() {
  try {
    // Access the user's webcam
    stream = await navigator.mediaDevices.getUserMedia({ 
      video: true,
      audio: { echoCancellation: true, noiseSuppression: true },
    });

    // Attach the stream to the video element
    video.srcObject = stream;

    // Create a new MediaRecorder instance to capture video chunks
    recorder = new MediaRecorder(stream);

    // Event handler for each data chunk received from the recorder
    recorder.ondataavailable = (e) => {
      const videoBlob = e.data;
      transmitVideoChunk(videoBlob);
      chunks.push(e.data);
    };

    // Start recording the video stream
    recorder.start();

    // Enable/disable buttons
    startButton.disabled = true;
    stopButton.disabled = false;

    // Start transmitting video chunks at the desired fps
    startTransmitting();
  } catch (error) {
    console.error('Error accessing webcam:', error);
  }
}`


  


  `
function transmitVideoBlob() {
    const videoBlob = new Blob(chunks, { type: 'video/webm' });
    socket.emit('video_data', videoBlob);
    // Clear the chunks array
    chunks = [];
}

// Start transmitting video chunks at the desired fps
function startTransmitting() {
    const videoInterval = 20000; // Interval between frames in milliseconds
    videoIntervalId = setInterval(() => {
        transmitVideoBlob();
    }, videoInterval);
}`


  


  In flask, I have created a function, which will call create_videos.
video_path : location to save the video
filename : file name of video
new_video_data_blob : binary data received from JS

  


  def create_videos(video_path, filename, new_video_data_blob):
    chunk_filename = os.path.join(video_path, f"{str(uuid1())}_{filename}")
    final_filename = os.path.join(video_path, filename)
    out_final_filename = os.path.join(video_path, "out_" + filename)
    # Save the current video chunk to a file
    with open(chunk_filename, "wb") as f:
        print("create file chunk ", chunk_filename)
        f.write(new_video_data_blob)

    if not os.path.exists(final_filename):
        # If the final video file doesn't exist, rename the current chunk file
        os.rename(chunk_filename, final_filename)
    else:
        while not os.path.exists(chunk_filename):
            time.sleep(0.1)
        # If the final video file exists, use FFmpeg to concatenate the current chunk with the existing file
        try:
            subprocess.run(
                [
                    "ffmpeg",
                    "-i",
                    f"concat:{final_filename}|{chunk_filename}",
                    "-c",
                    "copy",
                    "-y",
                    out_final_filename,
                ]
            )
            while not os.path.exists(out_final_filename):
                time.sleep(0.1)
            os.remove(final_filename)
            os.rename(out_final_filename, final_filename)

        except Exception as e:
            print(e)
        # Remove the current chunk file
        os.remove(chunk_filename)
    return final_filename


  


  When I record as well using below code in JS

  


  audio: { echoCancellation: true, noiseSuppression: true },


  


  I get the following error.

  


  [NULL @ 0x55e697e8c900] Invalid profile 5.
[webm @ 0x55e697ec3180] Non-monotonous DTS in output stream 0:0; previous: 37075, current: 37020; changing to 37075. This may result in incorrect timestamps in the output file.
[NULL @ 0x55e697e8d8c0] Error parsing Opus packet header.
    Last message repeated 1 times
[NULL @ 0x55e697e8c900] Invalid profile 5.
[NULL @ 0x55e697e8d8c0] Error parsing Opus packet header.


  


  

  


  But when I record video only, it will work fine.

  


  How can I merge the new binary data to the existing video file ?

  


• How to send audio video data to backend service for ffmpeg processing [closed]

  26 juin 2022, par Shinu Mathew

  How to send audio-video data from user's webcam to a backend service for ffmpeg processing from an angular application.

  


• Can we Stream Live Audio from Android phone using FFmpeg ?

  17 août 2023, par Uday

  Im using ffmpeg_kit_flutter package to Stream data to the RTSP server in Flutter.

  


  IOS : Working

  


  Android : Its not working

  


  Command Used :

  


  'ffmpeg -f avfoundation -i ":0" -acodec aac -f rtsp -rtsp_transport tcp "$Url"'


  


  When i ran a "ffmpeg -devices" command on android, it returns follwing response, through which i got to know android doesn't support avfoundation but android has android_camera,
Does this android_camera support audio too ?

  


  Command : 'ffmpeg -devices'

  


  Response :

  


  I/flutter (10620): logs:  libavutil      57. 28.100 / 57. 28.100
I/flutter (10620): logs:  libavcodec     59. 37.100 / 59. 37.100
I/flutter (10620): logs:  libavformat    59. 27.100 / 59. 27.100
I/flutter (10620): logs:  libavdevice    59.  7.100 / 59.  7.100
I/flutter (10620): logs:  libavfilter     8. 44.100 /  8. 44.100
I/flutter (10620): logs:  libswscale      6.  7.100 /  6.  7.100
I/flutter (10620): logs:  libswresample   4.  7.100 /  4.  7.100
I/flutter (10620): logs:Devices:
I/flutter (10620):  D. = Demuxing supported
I/flutter (10620):  .E = Muxing supported
I/flutter (10620):  --
I/flutter (10620): logs: D  android_camera   
I/flutter (10620): logs: D  lavfi            
I/flutter (10620): logs: DE video4linux2,v4l2


  


  Commands which I tried in Android

  


  FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a aac -f rtsp -rtsp_transport tcp "$Url"');

FFmpegKit.execute('-y -f android_camera -i 0:1 -r 30 -c:a libmp3lame -qscale:a 2 "/storage/emulated/0/Download/androidvideo.mp3"');

FFmpegKit.execute('-y -f android_camera -i 0:0 -r 30 -c:a wavpack -b:a 64k "/storage/emulated/0/Download/androidvideo.wav"');


  


  This command records video but no audio in it.

  


  FFmpegKit.execute('-video_size hd720 -f android_camera -camera_index 1 -i anything -r 10 -t 00:00:15 "$dir/androidvideo.mp4”');