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• streaming an mkv file while processing with ffmpeg

  2 avril 2019, par Phani Rithvij

  What I want to do :

  • I want to play an mkv video in Firefox.
  • But Firefox doesn’t support the mkv format.

  So I’ve searched a lot and found that,
  I could stream instead of playing the video following these steps.

  • mkv can be converted to an m3u8 using FFmpeg
  • The m3u8 points towards ts segment files
  • then use hls.js on the browser side to play the video

  But the catch is I want to do this programmatically.

  What I actually want to do :

  Steps

  • the client uploads a huge (>1 GB) mkv file to the client’s server (server is the client’s machine itself)

  • after the upload is done,

  • client requests to play the video.

  • the server starts transcoding and sends the client the m3u8 stream immediately instead of making the client wait for the transcoding to complete.

  • the client should be able to seek the video. (the most IMPORTANT part)

  It is possible as Emby and Plex both have implemented it.

  I was able to get this to work in chrome as it supports playing some mkv files.
  I wrote a node js server that accepts Range header and pseudo-streams the video.

  A gist

  But as I’ve mentioned Firefox says NO to mkv.

  So I tried the hls thing but I couldn’t quite get the command to generate the stream and also play on the fly.

  I started this on a command line

  ffmpeg -i ../stream.mkv -hls_list_size 0 -acodec copy -vcodec copy file.m3u8

  and a simple http-server on another shell instance

  My index.html file

      
  
      
  
          <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/hls.js'&gt;&lt;/script&gt;
          
  
  &lt;script&gt;<br />
  
              var video = document.getElementById('video');<br />
  
              if(Hls.isSupported()) {<br />
  
                  var hls = new Hls();<br />
  
                  hls.loadSource('file.m3u8');<br />
  
                  hls.attachMedia(video);<br />
  
                  hls.on(Hls.Events.MANIFEST_PARSED,function() {<br />
  
                      video.play();<br />
  
                  });<br />
  
              } else if (video.canPlayType('application/vnd.apple.mpegurl')) {<br />
  
                  video.src = 'file.m3u8';<br />
  
                  video.addEventListener('loadedmetadata',function() {<br />
  
                      video.play();<br />
  
                  });<br />
  
              }<br />
  
          &lt;/script&gt;
  

  and while it was running I went ahead and requested the server.

  I was able to get the video but It only seeks as far it’s converted into the ts files.

  And it’s random and the video length keeps increasing. It won’t play sometimes and after the FFmpeg is done converting to m3u8 the video plays if I refresh the webpage.

  I think this has to do with the continuous overwriting of the m3u8 file.
  is there a way to predetermine the file contents of m3u8 and fill it up ?

  I want to be able to seek even further and somehow spawn another FFmpeg process
  to start from that timestamp of the video ? How could I approach the seeking part ?

  So what I’d like to do again is

  • I want to request the server to play a video file
  • It spawns a child process FFmpeg that does the transcoding
  • Sends the client the stream
  • The client should be able to seek to the end and it should play the thing.

• RTSP stream to ffmpeg problems

  14 octobre 2022, par maeek

  I'm writing a web application for managing and viewing streams from ONVIF ip-cameras.
  
It's written in nodejs. The idea is to run a child process in node and pipe output to node, then send the buffer to client and render it on canvas. I have a working solution for sending data to client and rendering it on canvas using websockets but it only works on one of my cameras.

  


  I own 2 IP cameras and both of them have rtsp server.
  
One of them(let's name it camX) kind of works with this ffmpeg command (sometimes it just stops, maybe due to packet losses) :

  


  ffmpeg -rtsp_transport tcp -re -i  -f mjpeg pipe:1


  


  But the other one(camY) returns Nonmatching transport in server reply and exits.

  


  I discovered that the camY transport is unicast but ffmpeg doesn't support this particular lower_transport as I read on ffmpeg forum.

  


  So I started looking for a solution. My first idea was to use openRTSP which works fine with both streams.
I looked at the documentation and came up with this command :
  
openRTSP -4 -c  | ffmpeg -re -i pipe:0 -f mjpeg pipe:1
  
-4 parameter returns stream to pipe in mp4 format
  
And here's another problem I ran into, ffmpeg returns :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x559a4b6ba900] moov atom not found  
pipe:0: Invalid data found when processing input


  


  Is there any way to make this work ?
I tried various solutions I found, but none of them worked.

  


  EDIT

  


  As @Gyan suggested I used -i parameter instead of -4 but it didn't solve my problem.

  


  My command :

  


  openRTSP -V -i -c -K  | ffmpeg -loglevel debug -re -i pipe:0 -f mjpeg pipe:1
  
Created receiver for "video/H264" subsession (client ports 49072-49073)
Setup "video/H264" subsession (client ports 49072-49073)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
AVIFileSink::setWord(): SeekFile64 failed (err 29)
Outputting to the file: "stdout"
[avi @ 0x5612944268c0] Format avi probed with size=2048 and score=100
[avi @ 0x56129442f7a0] use odml:1
Started playing session
Receiving streamed data (signal with "kill -HUP 15028" or "kill -USR1 15028" to terminate)...
^C
[AVIOContext @ 0x56129442f640] Statistics: 16904 bytes read, 0 seeks
pipe:0: Invalid data found when processing input


  


  As you can see openRTSP command return err 29 but in meantime it outputs some data to pipe.
  
When I terminate the command ffmpeg shows that it read some data but couldn't process it.

  


  Here's the function that produces that error :

  


  void AVIFileSink::setWord(unsigned filePosn, unsigned size) {
  do {
    if (SeekFile64(fOutFid, filePosn, SEEK_SET) < 0) break;
    addWord(size);
    if (SeekFile64(fOutFid, 0, SEEK_END) < 0) break; // go back to where we were

    return;
  } while (0);

  // One of the SeekFile64()s failed, probable because we're not a seekable file
  envir() << "AVIFileSink::setWord(): SeekFile64 failed (err "
          << envir().getErrno() << ")\n";
}


  


  In my opinion it looks like it won't be able to seek file because it's a stream not a static file.
  
Any suggestion for a workaround ?

  


• Using ffmpeg in node, without using fluent-ffmpeg

  16 mai 2018, par drexdelta

  I am using ffmpeg without using fluent-ffmpeg. I am using ’child_process’ from node.

  First of all I verified how can I pass more than one arguments to the child process command. and I verified it given below code.

  I used copy command like this

  cp vid1.mp4 vid2.mp4

  which successfully copied vid1 into vid2.

  const execFile = require('child_process').execFile;
  
  const child = execFile('cp', ['vid1.mp4', 'vid3.mp4'], (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');

  Above code is content of the ’index.js’(default entry point in node). And running this with node . , which copies vid1 into vid3 successfully.

  Now, I want to do watermarking to the given video. For that I am using this tutorial. Currently link to the actual tutorial is broken, you can see it here.

  This is the command that I am using

  ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4

  Now the same command I am using like this ,

  const execFile = require('child_process').execFile;
  
  
  
  const child = execFile('ffmpeg', ['-i', 'input.mp4' , '-i' , 'logo.png' , '-filter_complex' , '"overlay=10:10"' , 'output.mp4' ], (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');

  and I am getting an error , that ,

  No such filter : ’"overlay’ Error initializing complex filters. Invalid
  argument

  /Users/neerpatel/Desktop/testProjects/childProcess/index.js:7
  throw error ;
  ^

  Error : Command failed : ffmpeg -i input.mp4 -i logo.png
  -filter_complex "overlay=10:10" output.mp4

  You can clearly see that the same command that runs in terminal directly, doesn’t work when I pass it in child process. Why does it happen ?

  Moreover, I wanted to add tag ’watermarking’ , but I can’t create tag since my reputation is below 1500. please, someone do it.

  UPDATE :
  I used EXEC , instead of execFile . and it worked like charm, but parent file kept waiting for child process. Child process never returns END signal. and this is my code.

  const exec = require('child_process').exec;
  
  
  
  const child = exec('ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4', (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');