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• How to get the correct result file data if I use Web Worker on ffmpeg.js ?

  23 avril 2019, par SuperBerry

  I have tried to use FFMPEG.js (https://github.com/Kagami/ffmpeg.js) to convert mp3 files on the browser/client side, and I followed the usage of the page of Web Worker. However, the worker works well on the converting and it seems the file has been converted, but I cannot get the correct result file data back.

  Here my code is :

  <code class="echappe-js">&lt;script&gt;<br />
  
  <br />
  
  var stdout = &quot;&quot;;<br />
  
  var outputhtml=&quot;&quot;;<br />
  
  var stderr = &quot;&quot;;<br />
  
  var outputfile;<br />
  
  <br />
  
  var sampleVideoData;<br />
  
  <br />
  
  function retrieveSampleVideo() {<br />
  
    var oReq = new XMLHttpRequest();<br />
  
    oReq.open(&quot;GET&quot;, &quot;short.mp3&quot;, true);<br />
  
    oReq.responseType = &quot;arraybuffer&quot;;<br />
  
  <br />
  
    oReq.onload = function (oEvent) {<br />
  
      var arrayBuffer = oReq.response;<br />
  
      if (arrayBuffer) {<br />
  
        sampleVideoData = new Uint8Array(arrayBuffer);<br />
  
      }<br />
  
    };<br />
  
  <br />
  
    oReq.send(null);<br />
  
  }<br />
  
  <br />
  
  function getDownloadLink(fileData, fileName) {<br />
  
    var a = document.createElement('a');<br />
  
    a.download = fileName;<br />
  
    var blob = new Blob([fileData]);<br />
  
    var src = window.URL.createObjectURL(blob);<br />
  
    a.href = src;<br />
  
    a.textContent = 'Click here to download ' + fileName + &quot;!&quot;;<br />
  
    document.body.appendChild(a);<br />
  
  }<br />
  
  <br />
  
  var worker = new Worker(&quot;ffmpeg-worker-mp4.js&quot;);<br />
  
  <br />
  
  retrieveSampleVideo();<br />
  
  <br />
  
  var memfs =[];  <br />
  
  <br />
  
  //[, {name: &quot;input.mp3&quot;, data: output}];<br />
  
  <br />
  
  worker.onmessage = function(e) {<br />
  
    var msg = e.data;<br />
  
  <br />
  
    switch (msg.type) {<br />
  
    case &quot;ready&quot;:<br />
  
      console.log(&quot;ready: &quot; + msg.data);<br />
  
      alert(sampleVideoData.length);<br />
  
      memfs.push({name: &quot;input.mp3&quot;, data: sampleVideoData});<br />
  
      memfs.push({name: &quot;output.mp3&quot;, data: outputfile});<br />
  
  <br />
  
      worker.postMessage({type: &quot;run&quot;, MEMFS: memfs, arguments: [&quot;-i&quot;, &quot;input.mp3&quot;, &quot;-y&quot;, &quot;output.mp3&quot;]});<br />
  
  <br />
  
  <br />
  
      break;<br />
  
    case &quot;stdout&quot;:<br />
  
      console.log(&quot;stdout: &quot; + msg.data);<br />
  
      stdout += msg.data + &quot;\n&quot;;<br />
  
      outputhtml+=msg.data + &quot;&lt;br&gt;&quot;;<br />
  
  <br />
  
      break;<br />
  
    case &quot;stderr&quot;:<br />
  
      console.log(&quot;stderr: &quot; + msg.data);<br />
  
      stderr += msg.data + &quot;\n&quot;;<br />
  
      outputhtml+=msg.data + &quot;&lt;br&gt;&quot;;<br />
  
  <br />
  
      break;<br />
  
  <br />
  
    case &quot;exit&quot;:<br />
  
  <br />
  
      console.log(&quot;Process exited with code &quot; + msg.data);<br />
  
      console.log(stdout);<br />
  
      document.write(outputhtml);<br />
  
  <br />
  
      getDownloadLink(outputfile, &quot;output.mp3&quot;);<br />
  
      worker.terminate();<br />
  
  <br />
  
  <br />
  
      break;<br />
  
    }<br />
  
  };<br />
  
  <br />
  
      &lt;/script&gt;
  

  And the console output looks good :

  stderr: ffmpeg version n3.1.2 Copyright (c) 2000-2016 the FFmpeg developers index.html:66:4
  
  stderr:   built with emcc (Emscripten gcc/clang-like replacement) 1.36.7 () index.html:66:4
  
  stderr:   configuration: --cc=emcc --enable-cross-compile --target-os=none --arch=x86 --disable-runtime-cpudetect --disable-asm --disable-fast-unaligned --disable-pthreads --disable-w32threads --disable-os2threads --disable-debug --disable-stripping --disable-all --enable-ffmpeg --enable-avcodec --enable-avformat --enable-avutil --enable-swresample --enable-swscale --enable-avfilter --disable-network --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --enable-decoder=vp8 --enable-decoder=vp9 --enable-decoder=theora --enable-decoder=mpeg2video --enable-decoder=mpeg4 --enable-decoder=h264 --enable-decoder=hevc --enable-decoder=png --enable-decoder=mjpeg --enable-decoder=vorbis --enable-decoder=opus --enable-decoder=mp3 --enable-decoder=ac3 --enable-decoder=aac --enable-decoder=ass --enable-decoder=ssa --enable-decoder=srt --enable-decoder=webvtt --enable-demuxer=matroska --enable-demuxer=ogg --enable-demuxer=avi --enable-demuxer=mov --enable-demuxer=flv --enable-demuxer=mpegps --enable-demuxer=image2 --enable-demuxer=mp3 --enable-demuxer=concat --enable-protocol=file --enable-filter=aresample --enable-filter=scale --enable-filter=crop --enable-filter=overlay --disable-bzlib --disable-iconv --disable-libxcb --disable-lzma --disable-sdl --disable-securetransport --disable-xlib --disable-zlib --enable-encoder=libx264 --enable-encoder=libmp3lame --enable-encoder=aac --enable-muxer=mp4 --enable-muxer=mp3 --enable-muxer=null --enable-gpl --enable-libmp3lame --enable-libx264 --extra-cflags=-I../lame/dist/include --extra-ldflags=-L../lame/dist/lib index.html:66:4
  
  stderr:   libavutil      55. 28.100 / 55. 28.100 index.html:66:4
  
  stderr:   libavcodec     57. 48.101 / 57. 48.101 index.html:66:4
  
  stderr:   libavformat    57. 41.100 / 57. 41.100 index.html:66:4
  
  stderr:   libavfilter     6. 47.100 /  6. 47.100 index.html:66:4
  
  stderr:   libswscale      4.  1.100 /  4.  1.100 index.html:66:4
  
  stderr:   libswresample   2.  1.100 /  2.  1.100 index.html:66:4
  
  stderr: [mp3 @ 0x812380] Warning: not compiled with thread support, using thread emulation index.html:66:4
  
  stderr: Input #0, mp3, from 'input.mp3': index.html:66:4
  
  stderr:   Metadata: index.html:66:4
  
  stderr:     encoder         : Lavf57.66.101 index.html:66:4
  
  stderr:   Duration: 00:00:03.02, start: 0.023021, bitrate: 128 kb/s index.html:66:4
  
  stderr:     Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s index.html:66:4
  
  stderr:     Metadata: index.html:66:4
  
  stderr:       encoder         : Lavc57.75 index.html:66:4
  
  stderr: [mp3 @ 0x8240f0] Warning: not compiled with thread support, using thread emulation index.html:66:4
  
  stderr: [libmp3lame @ 0x81b8a0] Warning: not compiled with thread support, using thread emulation index.html:66:4
  
  stderr: [mp3 @ 0x80b0f0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead. index.html:66:4
  
  stderr: Output #0, mp3, to 'output.mp3': index.html:66:4
  
  stderr:   Metadata: index.html:66:4
  
  stderr:     TSSE            : Lavf57.41.100 index.html:66:4
  
  stderr:     Stream #0:0: Audio: mp3 (libmp3lame), 48000 Hz, stereo, s16p index.html:66:4
  
  stderr:     Metadata: index.html:66:4
  
  stderr:       encoder         : Lavc57.48.101 libmp3lame index.html:66:4
  
  stderr: Stream mapping: index.html:66:4
  
  stderr:   Stream #0:0 -> #0:0 (mp3 (native) -> mp3 (libmp3lame)) index.html:66:4
  
  stderr: Press [q] to stop, [?] for help index.html:66:4
  
  stderr: size=      47kB time=00:00:03.00 bitrate= 129.6kbits/s speed=10.9x    index.html:66:4
  
  stderr: video:0kB audio:47kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.489831% index.html:66:4
  
  Process exited with code 0

  I have set the output into the memfs in the code :

  memfs.push(name : "output.mp3", data : outputfile) ;

  But I cannot get the result file data in outputfile to create the blob downloadd link.

• C# FFmpeg Command Prompt | Weird Result

  16 février 2018, par sword1st

  I have really weird problem with ffmpeg when it’s running with process in C#. Here is my code for video splitting :

          private void splitVideo()
  
      {
  
          Label.CheckForIllegalCrossThreadCalls = false;
  
          vlcControl1.Stop();
  
          label1.Text = "Process Started!";
  
  
  
          for (int i = 0; i < listBox2.Items.Count; i++)
  
          {
  
  
  
  
  
              string first = listBox2.Items[i].ToString().Split('-').First();
  
              string last = listBox2.Items[i].ToString().Split('-').Last();
  
  
  
              Directory.CreateDirectory(paths[listBox1.SelectedIndex].ToString() + "\\tempSplitFolder");
  
  
  
  
  
              string parameter2 = "-i " + paths[listBox1.SelectedIndex].ToString() + "\\" + "clip.mp4" + " -ss " + first + " -to " + last + " -async 1 " + "-c copy "
  
                  + paths[listBox1.SelectedIndex].ToString() + "\\tempSplitFolder\\" + i + ".mp4";
  
  
  
              Control.CheckForIllegalCrossThreadCalls = false;
  
              process1.StartInfo.UseShellExecute = false;
  
              process1.StartInfo.RedirectStandardOutput = true;
  
              process1.StartInfo.FileName = "ffmpeg";
  
              process1.StartInfo.Arguments = parameter2;
  
              process1.StartInfo.RedirectStandardError = true;
  
              process1.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
              process1.StartInfo.CreateNoWindow = true;
  
              process1.Start();
  
  
  
  
  
              ffreader = process1.StandardError;
  
              label1.Text = ffreader.ReadLine();
  
  
  
              while (!process1.HasExited)
  
              {
  
                  label1.Text = ffreader.ReadLine();
  
              }
  
  
  
          }

  But all output videos 262 bayt sized and corrupted. I can’t play that clips. When i remove "-c copy" part from my parameter2 variable it’s fine. But i don’t wanna re-encode videos cuz it’s time consuming. I can use this code with "-c copy" on ffmpeg there is no problem with the code. But why it’s acting weird and giving me corrupted videos i have no idea. Here my parameter2 variable in debug mode :

  -i D:\TestMainFolder\TestFolder\clip.mp4 -ss 00:22:00 -to 00:22:20 -async 1 -c copy D:\TestMainFolder\TestFolder\tempSplitFolder\0.mp4

  If i run this command manually with ffmpeg -i D :\etcetcetc.. it’s working. I’m really lost i need fresh eyes guys. Thanks a lot ! :)

• FFMPEG - cut video result in longer cut

  27 octobre 2023, par Pier Giorgio Misley

  I'm trying to cut the last 8 seconds of a video I got ; the problem is that ffmpeg is picking the last 10 seconds instead and I don't really know why. I checked and there is no offset between "0:00:00" and the effective start of the video, so why should it take more seconds ?

  


  this is my code :

  


  ffmpeg.exe -ss 00:01:02 -i "F:\temp\input.mp4" -c copy -t 00:00:08 "D:\temp\1_output.mp4"


  


  this is the output :

  


  


  ffmpeg version N-90893-gcae6f806a6 Copyright (c) 2000-2018 the FFmpeg

  


  developers built with gcc 7.3.0 (GCC) configuration : —enable-gpl

  


  —enable-version3 —enable-sdl2 —enable-bzlib —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libmfx —enable-amf —enable-ffnvcodec —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth libavutil 56. 17.100 / 56. 17.100 libavcodec 58. 19.100 / 58. 19.100 libavformat 58. 13.100 / 58. 13.100 libavdevice 58. 4.100 /

  


  

  58. 4.100 libavfilter 7. 21.100 / 7. 21.100 libswscale 5. 2.100 / 5. 2.100 libswresample 3. 2.100 / 3. 2.100 libpostproc 55. 2.100 / 55. 2.100 Input #0,

  


  


  mov,mp4,m4a,3gp,3g2,mj2, from 'F :\temp\input.mp4' : Metadata :

  


  major_brand : isom

  


  minor_version : 512

  


  compatible_brands : isomiso2avc1mp41

  


  encoder : Lavf58.13.100 Duration : 00:01:10.34, start : 0.000000, bitrate : 14542 kb/s

  


  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 576x1024, 14346 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)

  


  Metadata :

  


  handler_name : VideoHandler

  


  Stream #0:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)

  


  Metadata :

  


  handler_name : SoundHandler Output #0, mp4, to 'D :\temp\1_output.mp4' : Metadata :

  


  major_brand : isom

  


  minor_version : 512

  


  compatible_brands : isomiso2avc1mp41

  


  encoder : Lavf58.13.100

  


  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p, 576x1024, q=2-31, 14346 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc

  


  (default)

  


  Metadata :

  


  handler_name : VideoHandler Stream #0:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)

  


  Metadata :

  


  handler_name : SoundHandler Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help frame= 252

  


  fps=0.0 q=-1.0 Lsize= 3089kB time=00:00:07.99 bitrate=3164.7kbits/s

  


  speed=1e+003x video:2841kB audio:240kB subtitle:0kB other

  


  streams:0kB global headers:0kB muxing overhead : 0.283155%

  


  


  I don't really understand what i'm doing wrong

  


  Thanks