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• Ffmpeg change aspect ratio setsar setdar owerriding

  20 novembre 2016, par Ngoral

  I’m trying to change the aspect ratio of video, cause it’s being showed in a wrong way (it sould be 16:9 but shows 3:4).
  I’ve tried a lot of things, and none worked.
  E.g. I’ve tried to set SAR, but it changes DAR, so the aspect ratio stays the same. Here’s an example :

  ffmpeg -y -i rtmp://localhost/in/air-hdmi -vf "setsar=sar=16/9" -f flv rtmp://localhost/in/ngoraltestffmpeg 
  
  
  
  
  
  
  
  [flv @ 0x38143c0] audio stream discovered after head already parsed
  
  [aac @ 0x3818f20] element type mismatch 1 != 0
  
  [flv @ 0x38143c0] video stream discovered after head already parsed
  
  Input #0, flv, from 'rtmp://localhost/in/air-hdmi':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
    Duration: 00:00:00.00, start: 181748.084000, bitrate: N/A
  
      Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp
  
      Stream #0:1: Video: h264 (High), yuv420p, 720x576, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
  [flv @ 0x39bf5a0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, flv, to 'rtmp://localhost/in/ngoraltest':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
      encoder         : Lavf57.38.101
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 720x576 [SAR 16:9 DAR 20:9], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.46.100 flv
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp
  
      Metadata:
  
        encoder         : Lavc57.46.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:0 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  [aac @ 0x3a37000] element type mismatch 1 != 0
  
      Last message repeated 7 times
  
  [flv @ 0x39bf5a0] Failed to update header with correct duration.ate= 942.7kbits/s speed=2.37x    
  
  [flv @ 0x39bf5a0] Failed to update header with correct filesize.
  
  frame=  112 fps= 48 q=31.0 Lsize=     633kB time=00:00:05.18 bitrate= 999.9kbits/s speed=2.23x    
  
  video:546kB audio:82kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.846813%
  
  Exiting normally, received signal 2.

  I’ve also tried to apply scale=720:-1 and -aspect 16:9 and all left the same.

  BUT ! Wnen I write ffplay -vf setsar=16/9 rtmp://localhost/in/ngoraltest it shows perfectly what I need.
  What could be thae problem and hoe to solve it ?

  P.S. I’m little bit confused that there’s no onformation about SAR and DAR of input signal, but I can do totally nothing with it.

• FFMPEG via PHP - no thumbnail or log output generated

  10 octobre 2018, par Utkanos

  I’m trying to get my head around command line syntax in the form of FFMPEG via PHP.

  I’ve successfully installed it and I can use it fine, until I try to :

  • run background tasks
  • generate output to a log

  This code attempts to create a thumbnail from a video. And it does, if I make it synchrnous, i.e. remove everything from onwards code>....

  shell_exec($i = 'ffmpeg -y -i '.$fp.' -ss '.$secs.' -vframes 1 '.$dirs_path.'/thumb.png  null >/dev/null 2>/ffmpeg.txt &');

  I’ve derived the background part of this command from this page on the official FFMPEG site.

  ($secs is an integer denoting a seconds point within the video duration, and $fp is the save path of the video. Both are valid.)

  So the thumb doesn’t get generated, and there’s no ffmpeg.txt created, either in the place where the script runs, or in the server root or anything. I may be looking in the wrong place... I’m unsure what all this is relative to.

  Any help appreciated.

• Capturing audio data (using javascript) and uploading on a server as MP3

  4 septembre 2018, par Michel

  Following a number of resources on the internet, I am trying to build a simple web page, where I can go to record something (my voice), then make a mp3 file out of the recording and finally upload that file to a server.

  At this point I can do the recording and also play back, but I haven’t gone as far as uploading, it seems like I cannot even make an mp3 file locally.
  Can someone tell me what I am doing wrong, or in the wrong order ?

  Below is all the code I have at this point.

      
  
      
  
      
  
      
  
  
  
  
  
  <div>
  
      <h2>Audio record and playback</h2>
  
      <p>
  
          <button></button></p><h3>Start</h3>
  
          <button disabled="disabled"><h3>Stop</h3></button>
  
          <audio controls="controls"></audio>
  
          <a></a>
  
      
  
  </div>
  
  
  
  <code class="echappe-js">&lt;script&gt;<br />
  
    var player = document.getElementById('player');<br />
  
  <br />
  
    var handleSuccess = function(stream) {<br />
  
      rec = new MediaRecorder(stream);<br />
  
  <br />
  
      rec.ondataavailable = e =&gt; {<br />
  
          audioChunks.push(e.data);<br />
  
          if (rec.state == &quot;inactive&quot;) {<br />
  
              let blob = new Blob(audioChunks,{type:'audio/x-mpeg-3'});<br />
  
              player.src = URL.createObjectURL(blob);<br />
  
              player.controls=true;<br />
  
              player.autoplay=true;<br />
  
              // audioDownload.href = player.src;<br />
  
              // audioDownload.download = 'sound.data';<br />
  
              // audioDownload.innerHTML = 'Download';<br />
  
              mp3Build();<br />
  
          }<br />
  
      }<br />
  
  <br />
  
      player.src = stream;<br />
  
    };<br />
  
  <br />
  
    navigator.mediaDevices.getUserMedia({audio:true/*, video: false */})<br />
  
        .then(handleSuccess);<br />
  
  <br />
  
  startRecord.onclick = e =&gt; {<br />
  
    startRecord.disabled = true;<br />
  
    stopRecord.disabled=false;<br />
  
    audioChunks = [];<br />
  
    rec.start();<br />
  
  }<br />
  
  <br />
  
  stopRecord.onclick = e =&gt; {<br />
  
    startRecord.disabled = false;<br />
  
    stopRecord.disabled=true;<br />
  
    rec.stop();<br />
  
  }<br />
  
  <br />
  
  <br />
  
  var ffmpeg = require('ffmpeg');<br />
  
  <br />
  
  function mp3Build() {<br />
  
  try {<br />
  
      var process = new ffmpeg('sound.data');<br />
  
      process.then(function (audio) {<br />
  
          // Callback mode.<br />
  
          audio.fnExtractSoundToMP3('sound.mp3', function (error, file) {<br />
  
              if (!error) {<br />
  
                  console.log('Audio file: ' + file);<br />
  
          audioDownload.href = player.src;<br />
  
          audioDownload.download = 'sound.mp3';<br />
  
          audioDownload.innerHTML = 'Download';<br />
  
        } else {<br />
  
          console.log('Error-fnExtractSoundToMP3: ' + error);<br />
  
        }<br />
  
          });<br />
  
      }, function (err) {<br />
  
          console.log('Error: ' + err);<br />
  
      });<br />
  
  } catch (e) {<br />
  
      console.log(e.code);<br />
  
      console.log(e.msg);<br />
  
  }<br />
  
  }<br />
  
  <br />
  
  &lt;/script&gt;
  

  When I try to investigate and see what is happening using the Debugger inside the Web Console ; on the line :

  var process = new ffmpeg('sound.data');

  I get this message :

  Paused on exception
  
  TypeError ffmpeg is not a contructor.

  And on the line :

  var ffmpeg = require('ffmpeg');

  I get this message :

  Paused on exception
  
  ReferenceError require is not defined.

  Beside when I watch the expression ffmpeg, I can see :

  ffmpeg: undefined

  After some further investigations, and using browserify I use the following code :

      
  
      
  
      
  
      
  
  
  
  
  
  <div>
  
      <h2>Audio record and playback</h2>
  
      <p>
  
          <button></button></p><h3>Start</h3>
  
          <button disabled="disabled"><h3>Stop</h3></button>
  
          <audio controls="controls"></audio>
  
          <a></a>
  
      
  
  </div>
  
  
  
  <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/bundle.js'&gt;&lt;/script&gt;
  &lt;script&gt;<br />
  
    var player = document.getElementById('player');<br />
  
  <br />
  
    var handleSuccess = function(stream) {<br />
  
      rec = new MediaRecorder(stream);<br />
  
  <br />
  
      rec.ondataavailable = e =&gt; {<br />
  
          if (rec.state == &quot;inactive&quot;) {<br />
  
              let blob = new Blob(audioChunks,{type:'audio/x-mpeg-3'});<br />
  
              //player.src = URL.createObjectURL(blob);<br />
  
              //player.srcObject = URL.createObjectURL(blob);<br />
  
              //player.srcObject = blob;<br />
  
              player.srcObject = stream;<br />
  
              player.controls=true;<br />
  
              player.autoplay=true;<br />
  
              // audioDownload.href = player.src;<br />
  
              // audioDownload.download = 'sound.data';<br />
  
              // audioDownload.innerHTML = 'Download';<br />
  
              mp3Build();<br />
  
          }<br />
  
      }<br />
  
  <br />
  
      //player.src = stream;<br />
  
      player.srcObject = stream;<br />
  
    };<br />
  
  <br />
  
    navigator.mediaDevices.getUserMedia({audio:true/*, video: false */})<br />
  
        .then(handleSuccess);<br />
  
  <br />
  
  startRecord.onclick = e =&gt; {<br />
  
    startRecord.disabled = true;<br />
  
    stopRecord.disabled=false;<br />
  
    audioChunks = [];<br />
  
    rec.start();<br />
  
  }<br />
  
  <br />
  
  stopRecord.onclick = e =&gt; {<br />
  
    startRecord.disabled = false;<br />
  
    stopRecord.disabled=true;<br />
  
    rec.stop();<br />
  
  }<br />
  
  <br />
  
  <br />
  
  var ffmpeg = require('ffmpeg');<br />
  
  <br />
  
  function mp3Build() {<br />
  
  try {<br />
  
      var process = new ffmpeg('sound.data');<br />
  
      process.then(function (audio) {<br />
  
          // Callback mode.<br />
  
          audio.fnExtractSoundToMP3('sound.mp3', function (error, file) {<br />
  
              if (!error) {<br />
  
                  console.log('Audio file: ' + file);<br />
  
          //audioDownload.href = player.src;<br />
  
          audioDownload.href = player.srcObject;<br />
  
          audioDownload.download = 'sound.mp3';<br />
  
          audioDownload.innerHTML = 'Download';<br />
  
        } else {<br />
  
          console.log('Error-fnExtractSoundToMP3: ' + error);<br />
  
        }<br />
  
          });<br />
  
      }, function (err) {<br />
  
          console.log('Error: ' + err);<br />
  
      });<br />
  
  } catch (e) {<br />
  
      console.log(e.code);<br />
  
      console.log(e.msg);<br />
  
  }<br />
  
  }<br />
  
  <br />
  
  &lt;/script&gt;
  

  That solved the problem of :

  the expression ffmpeg being: undefined

  But the play back is no longer working. I may not be doing the right thing with player.srcObject and maybe some other things too.

  When I use this line :

  player.srcObject = URL.createObjectURL(blob);

  I get this message :

  Paused on exception
  
  TypeError: Value being assigned to HTMLMediaElement.srcObject is not an object.

  And when I use this line :

  player.srcObject = blob;

  I get this message :

  Paused on exception
  
  TypeError: Value being assigned to HTMLMediaElement.srcObject does not implement interface MediaStream.

  Finally, if I use this :

  player.srcObject = stream;

  I do not get any error message but the voice recording still does not work.