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• How to use PHP FFMPEG to alter audio binary header bytes offset

  27 mai 2019, par SomniusX

  I use the following method to create a WNB file that is flashable to my Electric Unicycle Ninebot Z10

  First audacity to make the file raw pcm 16khz 16bit mono littleendian
  Then wnb-slicer golang app to convert that raw file into wnb.

  Today i did the same with ffmpeg

  ffmpeg -i $1 -acodec pcm_s16le -f s16le -ac 1 -ar 16000 -acodec pcm_s16le $1.raw
  
  ../wnb-slicer-master/wnb-slicer -file-name $1.raw

  where $1 is the original file

  About an hour ago i did the ffmpeg part with php-ffmpeg but i can’t have golang run on a webserver.

  So i thought if ffmpeg does bytes manipulation like the golang app does here

  Thank you in advance !

  p.s. this project will help all electric unicycle owners of the Z series wheels to change audio voices/sounds on their wheels !!

• avcodec.h and avfiltergraph.h files are not found

  12 avril 2019, par Dries Jans

  I’m testing out a RTSP encoded stream transmitter using mpeg4. I found the code from this topic : FFMPEG to send RTSP encoded stream C++

  I think there is a problem with different build versions. I’m using the
  4.1.1 build.

  I’ve already tried to use the avcodec header in the libavcodec directory, but I have no idea if this is correct because I can’t find a replacement for the avfiltergraph header. I tried replacing it with avfilter header, but this gave an error on the CODEC_ID_H264.

  #include <libavfilter></libavfilter>avfiltergraph.h>
  
  #include <libavfilter></libavfilter>avcodec.h>

  You also need to execute next command to provide an listening service.

  ffplay -rtsp_flags listen -i rtsp://127.0.0.1:8554/live.sdp

• 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.