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• How to cut a video in specific start & end time in ffmpeg by Node JS ?

  26 juin 2015, par Nazmul Hossain Bilash

  I want to cut a video in specific start & end time & save it. I am able to copy a full video but cant understand to how to cut specific time of that video by Node JS.

  Video copy code :

    ffmpeg('public/'+req.body.video)
  
      .on('end', function(err) {   
  
          if(!err)
  
          {
  
            console.log('Done');
  
  
  
          }                 
  
  
  
      })
  
      .on('error', function(err){
  
          console.log('error: '+err);
  
          callback(err);
  
      }).run();

• Android HLS : Any way to edit the m3u8 file so that I know which segment is currently streaming/playing in my player using HLS

  1er août 2014, par hclee

  I am now working on a VOD project using HLS.

  I use the VideoViewBuffer in VitamioDemo to stream my video that is stored in my local server.
  The Vitamio library is awesome that I am able to stream the video, getting the bit rate, buffering percentage and some metadata.

  We use ffmpeg to convert the video into m3u8 and the corresponding ts files.
  But now our team want to know which segment (which ts file) of the video the HLS is currently streaming.

  That’s a very important part in our project but we get stuck in this point.

  I tried to use the MediaMetadata in Vitamio but only the Duration of the video is found.
  I am wondering if we can add some metadata in the m3u8 file so that we can retrieve the name of the current segment during streaming.
  eg :
  The original m3u8 is like this :
  #EXTINF:10.500000,
  stream00000.ts

  Is it possible for me to change it as follows :
  #EXTINF:10.500000, name of segment
  stream00000.ts

  But all I can get using MediaMetaDataRetriever is null except for the duration.

  It seems that no body have done this before so I can’t find any very useful information about this.

  Do anybody how to implement this ?
  Or should I use some packet sniffer to monitor the network traffic by myself ?
  Or Would MediaScanner be helpful ?
  Or I need to use code in android.os ?

  Thanks in advance !

• Pipe a HTTP response

  30 juillet 2014, par viperfx

  How do I pipe an HTTP response like in NodeJS. Here is the snippet I am using in NodeJS :

  request({
  
    url: audio_file_url,
  
  }).pipe(ffmpeg_process.stdin);

  How can I achieve the same result in Go ?

  I am trying to pipe a audio stream from HTTP into an FFmpeg process so that it converts it on the fly and returns the converted file back to the client.

  Just so its clear to everyone here is my source code so far :

  func encodeAudio(w http.ResponseWriter, req *http.Request) {
  
      path, err := exec.LookPath("youtube-dl")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err)
  
      }
  
      path_ff, err_ff := exec.LookPath("ffmpeg")
  
      if err != nil {
  
          log.Fatal("LookPath: ", err_ff)
  
      }
  
  
  
      streamLink := exec.Command(path,"-f", "140", "-g", "https://www.youtube.com/watch?v=VIDEOID")
  
  
  
      var out bytes.Buffer
  
      streamLink.Stdout = &out
  
      cmdFF := exec.Command(path_ff, "-i", "pipe:0", "-acodec", "libmp3lame", "-f", "mp3", "-")
  
      resp, err := http.Get(out.String())
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      // pr, pw := io.Pipe()
  
      defer resp.Body.Close()
  
      cmdFF.Stdin = resp.Body
  
      cmdFF.Stdout = w
  
      streamLink.Run()
  
      //get ffmpeg running in another goroutine to receive data
  
      errCh := make(chan error, 1)
  
      go func() {
  
          errCh <- cmdFF.Run()
  
      }()
  
  
  
      // close the pipeline to signal the end of the stream
  
      // pw.Close()
  
      // pr.Close()
  
  
  
      // check for an error from ffmpeg
  
      if err := <-errCh; err != nil {
  
          // ff error
  
      }
  
  }

  Error : 2014/07/29 23:04:02 Get : unsupported protocol scheme ""