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• Add multiple audio over a background audio using ffmpeg

  26 février 2017, par Vivek Bhatt

  I am trying to create an audio file which will have a base audio and multiple other audios over it.
  And also when the overlayed audio plays, the background audio should be mute or in lower volume.

  For eg :
  There is a song A.mp3. Over this song, i want to add multiple other audios (1.mp3, 2.mp3, 3.mp3 ......) at a particular time period. Let say, 1.mp3 plays at 5th sec to 8th sec, 2 .mp3 plays at 10th sec to 12th sec and so on.
  Also this should be added as an overlay such that, background sound will always be playing and when the overlayed audio plays, the background audio should be muted or slowed in volume.

  I tried with ffmeg library but haven’t found any solution yet.

• WebM live streaming via DASH

  23 février 2017, par ewack

  I am following the instructions here to try to make WebM live streaming via DASH. My input is from an Axis camera and it is streaming as h264 encoding. I am using node to spin up the ffmpeg processes. I am able to create the .hdr file and the .chk files. The .mpd file is even created but it’s empty and I get an error saying :

  Could not write header for output file #0 (incorrect codec parameters ?): Operation not permittedStream mapping: Stream #0:0 -> #0:0 (copy)

  Here’s all of my code :

  var express = require('express');
  
  spawn = require('child_process').spawn;
  
  
  
  var app = express();
  
  
  
  app.use(express.static(__dirname + '/public'));
  
  
  
  app.listen(8080);
  
  console.log("Running on Port 8080");
  
  
  
  var ffmpeg1 = spawn('ffmpeg', [
  
      '-y',
  
      //video
  
      '-i', 'rtsp://admin:password@192.168.1.54:554/axis-media/media.amp?videocodec=h264&resolution=1280x720',
  
  
  
      '-map', '0:0',
  
      '-pix_fmt', 'yuv420p',
  
      '-color_range', '2',
  
      '-c:v', 'libvpx-vp9',
  
  
  
      '-s', '1280x720',
  
      '-keyint_min', '25',
  
      '-g', '25', 
  
  
  
      // //VP9_LIVE_PARAMS
  
      '-speed', '6', 
  
      '-tile-columns', '4',
  
      '-frame-parallel', '1', 
  
      '-threads', '8', 
  
      '-static-thresh', '0', 
  
      '-max-intra-rate', '300',
  
      '-deadline', 'realtime', 
  
      '-lag-in-frames', '0',
  
      '-error-resilient', '1',
  
  
  
      '-f', 'webm_chunk',
  
      '-header', 'public/glass_360.hdr',
  
      '-chunk_start_index', '1',
  
      'public/glass_360_%d.chk',
  
  ]);
  
  
  
  
  
  setTimeout(()=> {
  
    var ffmpeg2 = spawn('ffmpeg', [
  
      '-y',
  
      '-f', 'webm_dash_manifest',
  
      '-live', '1',
  
      '-i', 'public/glass_360.hdr',
  
      '-c', 'copy',
  
      '-map', '0',
  
      '-r', '25',
  
      '-framerate', '25',
  
  
  
      '-f', 'webm_dash_manifest',
  
      '-live', '1',
  
  
  
      '-adaptation_sets', '"id=0,streams=0"',
  
      '-chunk_start_index', '1',
  
      '-chunk_duration_ms', '2000',
  
      '-time_shift_buffer_depth', '7200',
  
      '-minimum_update_period', '7200',
  
  
  
      'public/glass_live_manifest.mpd'
  
    ]);
  
    ffmpeg2.stdout.on('data', 
  
        function (data) {
  
            console.log('ff2std: ' + data);
  
        }
  
    );
  
  
  
    ffmpeg2.stderr.on('data', 
  
        function (data) {
  
            console.log('ff2err: ' + data);
  
        }
  
    );
  
  }, 5000);
  
  
  
  ffmpeg1.stdout.on('data', 
  
      function (data) {
  
          console.log('ff1std: ' + data);
  
      }
  
  );
  
  
  
  ffmpeg1.stderr.on('data', 
  
      function (data) {
  
          console.log('ff1err: ' + data);
  
      }
  
  );

  Here is all of my output :

  Running on Port 8080
  
  ff1err: ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda
  
  
  
  ff1err:   libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  
  
  ff1err: Input #0, rtsp, from 'rtsp://admin:password@192.168.1.54:554/axis-media/media.amp?videocodec=h264&resolution=1280x720':
  
    Metadata:
  
      title           : Session streamed with GStreamer
  
      comment         : rtsp-server
  
    Duration: N/A, start: 0.033344
  
  ff1err: , bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn, 180k tbc
  
  
  
  ff1err: [swscaler @ 0x7f8df281bc00] deprecated pixel format used, make sure you did set range correctly
  
  
  
  ff1err: [libvpx-vp9 @ 0x7f8df2800600] v1.6.1
  
  
  
  ff1err: Output #0, webm_chunk, to 'public/glass_360_%d.chk':
  
    Metadata:
  
      title           : Session streamed with GStreamer
  
      comment         : rtsp-server
  
      encoder         : Lavf57.56.101
  
  
  
  ff1err:     Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p(pc), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 200 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libvpx-vp9
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))
  
  Press [q] to stop, [?] for help
  
  
  
  ff1err: frame=   10 fps=0.0 q=0.0 size=N/A time=00:00:00.36 bitrate=N/A speed=0.71x    
  
  ff1err: frame=   25 fps= 25 q=0.0 size=N/A time=00:00:00.96 bitrate=N/A speed=0.946x    
  
  ff1err: frame=   40 fps= 26 q=0.0 size=N/A time=00:00:01.56 bitrate=N/A speed=1.03x    
  
  ff1err: frame=   55 fps= 27 q=0.0 size=N/A time=00:00:02.16 bitrate=N/A speed=1.07x    
  
  ff1err: frame=   70 fps= 28 q=0.0 size=N/A time=00:00:02.76 bitrate=N/A speed=1.09x    
  
  ff1err: frame=   85 fps= 28 q=0.0 size=N/A time=00:00:03.36 bitrate=N/A speed=1.11x    
  
  ff2err: ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda
  
  
  
  ff2err:   libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  
  
  ff2err: [webm_dash_manifest @ 0x7fbc5b80b400] Could not find codec parameters for stream 0 (Video: vp9, none, 1280x720): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  
  
  ff2err: Input #0, webm_dash_manifest, from 'public/glass_360.hdr':
  
    Metadata:
  
      title           : Session streamed with GStreamer
  
      encoder         : Lavf57.56.101
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: vp9, none, 1280x720
  
  ff2err: , SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        webm_dash_manifest_file_name: glass_360.hdr
  
        webm_dash_manifest_track_number: 1
  
  
  
  ff2err: Could not write header for output file #0 (incorrect codec parameters ?): Operation not permittedStream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  
  
  ff2err:     Last message repeated 1 times
  
  
  
  ff1err: frame=  101 fps= 29 q=0.0 size=N/A time=00:00:04.00 bitrate=N/A speed=1.13x    
  
  ff1err: frame=  116 fps= 29 q=0.0 size=N/A time=00:00:04.60 bitrate=N/A speed=1.14x    
  
  ff1err: frame=  131 fps= 29 q=0.0 size=N/A time=00:00:05.20 bitrate=N/A speed=1.15x    
  
  ff1err: frame=  146 fps= 29 q=0.0 size=N/A time=00:00:05.80 bitrate=N/A speed=1.15x    
  
  ff1err: frame=  161 fps= 29 q=0.0 size=N/A time=00:00:06.40 bitrate=N/A speed=1.15x    
  
  ff1err: frame=  177 fps= 29 q=0.0 size=N/A time=00:00:07.04 bitrate=N/A speed=1.16x    
  
  ff1err: frame=  192 fps= 29 q=0.0 size=N/A time=00:00:07.64 bitrate=N/A speed=1.16x    
  
  ff1err: frame=  207 fps= 29 q=0.0 size=N/A time=00:00:08.24 bitrate=N/A speed=1.16x    
  
  ff1err: frame=  222 fps= 29 q=0.0 size=N/A time=00:00:08.84 bitrate=N/A speed=1.17x    
  
  ff1err: frame=  237 fps= 29 q=0.0 size=N/A time=00:00:09.44 bitrate=N/A speed=1.17x    
  
  ff1err: frame=  252 fps= 29 q=0.0 size=N/A time=00:00:10.04 bitrate=N/A speed=1.17x  

  Why is ffmpeg creating an empty .mpd file ?

• Android video unplayable at iOS

  21 février 2017, par Atif Imran

  I’ve found that videos with codec H.264, MPEG-4 HE AAC V2 have no problem with my code here. But when I use a video of codec H.264, AAC (Sent from Android device) the videos are again black. Now my question is how do I convert a video to iOS playable codec.