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• FFMPEG : Add black frames at start and end of video

  7 novembre 2014, par user3729198

  Im trying to add 10 second of black frames to the beginning of my clip and 30 seconds of black frames at end of clip. This is what I got so far.

  ---

  ffmpeg -i XX.mp4 -vf "
  
  color=c=black:s=720x576:d=10 [pre] ;
  
  color=c=black:s=720x576:d=30 [post] ;
  
  [pre] [in] [post] concat=n=3" -an -vcodec mpeg2video -pix_fmt yuv422p -s 720v576 -aspect 16:9 -r 25 -minrate 30000k -maxrate 30000k -b 30000k output.mpg

  ---

  It works in some cases. But Only on specific material with right "SAR" values. But most of the time I get this error.

  ---

  Input link in1:v0 parameters (size 720x576, SAR 35:24) do not match the corresponding output link in0:v0 parameters (720x576, SAR 1:1)
  
  [Parsed_concat_2 @ 0x7f9853d048c0] Failed to configure output pad on Parsed_concat_2

  ---

  Is there a way to complement my code or another way to do this ?

• FFmpeg streaming stuck few minutes after start [closed]

  19 février, par josue ramirez

  Sorry for my english ! :D

  


  I'm trying to make a live video stream from my webcam with ffmpeg using Node.

  


  I get the images or frames from ffmpeg via pipe1 on the stdout event and send them via a socket-io client to my angular app to play the stream.

  


  So far the stream starts fine and my angular app can play it fine, but after a certain time (8 minutes or so) ffmpeg stops sending data and the stream in my angular app stops and if I want to start the webcam again it's not possible anymore because it's apparently occupied by another process. I've been trying to figure out what's going on and what I've noticed is that the ffmpeg process just stops and the process is no longer visible with the top command (ubuntu), but the child process in node still shows a ffmpeg process as if it were a zombie process.

  


  I've tried running ffmpeg from the terminal to save an mp4 file with the stream and in that case there is no problem, the recording doesn't stop even using pipe1. Only when I run ffmpeg from my Node app, the error occurs.

  


  Does anyone have any idea what could be going on ?

  


  This command is the one that is executed to send the data through pipe1 both from node and from the terminal but it only stops in Node

  


  ffmpeg -f v4l2 -input_format mjpeg -video_size 800x600 -i /dev/video0 -q:v 4 -f image2pipe pipe1


  


  The same thing happens when saving an mp4 video only in Node it fails

  


  ffmpeg -f v4l2 -input_format mjpeg -video_size 800x600 -i /dev/video0 -q:v 4 video.mp4


  


  This is my function that starts the streaming

  


  export const startCamera = () => {
    logger.info('Starting camera ', cameraName);

    const inputFormat = process.platform === 'win32' ? 'dshow' : 'v4l2';

    const ffmpegArgs = [
        '-f', inputFormat, // Formato de entrada según la plataforma
    ];

    if (process.platform === 'linux') {
        ffmpegArgs.push(
            '-input_format', 'mjpeg',  // Especificar el formato antes de video_size
            '-video_size', '800x600',  // Tamaño de la imagen
        );
    }
    
    ffmpegArgs.push(
        '-i', cameraName,    // Dispositivo de entrada
        '-vf', 'fps=15',     // Fotogramas por segundo
        '-q:v', '10',        // Calidad de video
        '-f', 'image2pipe',  // Formato de salida
        'pipe:1'             // Salida por stdout
    );

    try {
        logger.info('FFmpeg command: ffmpeg', ffmpegArgs.join(' '));
        ffmpeg = spawn('ffmpeg', ffmpegArgs);
        let cameraOpen = false;
        // Enviar los datos del fotograma a través del WebSocket
        ffmpeg.stdout.on('data', (chunk) => {
            logger.debug(`Sending chunk of ${chunk.length} bytes`);
            if (!cameraOpen) {
                cameraOpen = true;
                serialConnection.connect();
                logger.info('Camera started!!');
            }

            if (streamWS.isActive()) {
                streamWS.send(chunk);
            }
        });
        // Manejo de errores
        ffmpeg.stderr.on('error', (data) => {
            logger.error('FFmpeg Error:', data.toString());
        });

        ffmpeg.on('close', async () => {
            logger.info('Camera closed....', cameraName);
            if (!cameraOpen) {
                await commandWS.send(
                    {
                        command: COMMANDS.START_STREAM,
                        isError: true,
                        response: `Error al intentar iniciar la camara ${cameraName}, verificar que la camara se encuentre bien conectada.`,
                    },
                    COMMANDS_EVENTS.ROBOT_RESPONSE
                );
            }
            cameraOpen = false;
            await serialConnection.close();
            stopCamera();
            await streamWS.disconnectWS();
        });
    } catch (e) {
        logger.error('Error tryng to start the camera...', e);
    }
};


  


• FFMpeg generated m3u8 segmented videos takes forever to start playing

  20 novembre 2014, par Michael Gaylord

  I am using ffmpeg to generate a segmented list of files in order to stream them to an iOS app. The list of files is generated fine but when it comes time to play them, the video needs to be downloaded in its entirety before playback starts. This behaviour seems to be the case on iOS, Safari and VLC.

  Does anybody know why this is happening and how I can improve the performance of playback ? I have complete control over how the files are recorded in iOS, as well as how they are processed. Here is a sample stream :

  http://www.bytesizecreations.com/storie-test/hls.m3u8

  Here are my ffmpeg commands to generate the segments from the file :

  ffmpeg -i joined.ts -flags -global_header -vcodec copy -acodec copy -map 0 -f segment -segment_time 2 -segment_list hls.m3u8 -segment_list_size 999999 -segment_format mpegts out%03d.ts

  Here is the output of ffprobe on the file :

    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Input #0, mpegts, from 'joined.ts':
  
    Duration: 00:00:07.96, start: 1.441667, bitrate: 3899 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x720, 24 fps, 24 tbr, 90k tbn, 180k tbc
  
      Stream #0:1[0x101](und): Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 222 kb/s