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• How to convert the stream from h265 to h264

  12 avril 2021, par Hrithik Anchaliya

  I'm trying to create a media server using nodejs, and i have no problem streaming any formats but
Since web browsers cant play H265 codec videos i need to convert them to H264 while createReadStream creates a chunk so that i dont have to convert them completely before hand, just that chunk which is sent by the server to the browser.

  


  const path = 'assets/yourfavmov.mkv';
const stat = fs.statSync(path);
const fileSize = stat.size;
const range = req.headers.range;
if (range) {  
const rangeArray = range.replace(/bytes=/, "").split("-"); 
console.log(rangeArray) 
const start = parseInt(rangeArray[0], 10); 
const end = rangeArray[1] ? parseInt(rangeArray[1], 10) : fileSize-1; 
const chunksize = (end-start) + 1; 
const fileChunk = fs.createReadStream(path, {start, end});
const head = {
    'Content-Range': `bytes ${start}-${end}/${fileSize}`,  
    'Accept-Ranges': 'bytes', 
    'Content-Length': chunksize, 
    'Content-Type': 'video/x-matroska' 
};
res.writeHead(206, head); 
fileChunk.pipe(res); 
} else {
   res.end("wont let you stream");
}


  


  I tried to convert the stream using ffmpeg-stream, like so

  


  const converter = new Converter();
const input = converter.createInputStream({
      f: "matroska,webm",
      vcodec : "hevc"
})
const fileChunk = fs.createReadStream(path, {start, end}); 
fileChunk.pipe(input);
converter
  .createOutputStream({ f: "matroska,webm", vcodec: "h264" })
  .pipe(res);


  


  But i have no idea what i did is correct or wrong, so no luck
so is there an way to do it right ?

  


  Thanks in advance.

  


• Xuggler Transcoder error

  4 septembre 2013, par Andrei Baidoc

  I tried to follow the instructions from here : http://www.javacodegeeks.com/2010/05/rtmp-to-rtsp-re-stream-using-wowza-and.html

  All worked fine, Xuggler has been installed with no errors, all tests passed but now when I try to start the transcoder I get this error :

  root@heb1:~# java -jar transcoder-1.0.jar
  
  11:25:28.902 [main] WARN  com.xuggle.ferry.JNILibrary - Failure: library load of library: xuggle; url: /tmp/xuggle/xuggle6615346873936202632.tmp; error: java.lang.UnsatisfiedLinkError: /tmp/xuggle/xuggle6615346873936202632.tmp: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /tmp/xuggle/xuggle6615346873936202632.tmp)
  
  11:25:46.673 [main] ERROR com.xuggle.xuggler - URL: rtmp://localhost/live/b; Error: could not find output format (../../../../../../../csrc/com/xuggle/xuggler/Container.cpp:513)
  
  java.lang.RuntimeException: could not open output url: rtmp://localhost/live/b
  
          at com.xuggle.xuggler.Converter.setupStreams(Converter.java:670)
  
          at com.xuggle.xuggler.Converter.run(Converter.java:1203)
  
          at com.agilio.transcoder.App.main(App.java:34)

  So the transcoder sees the input stream, but for the output it says that it can't find the output format, althow it is send to Xuggler :

  String[] parameters = new String[] { "--acodec", "libfaac", "--vcodec",
  
                      "libx264", "--vpreset",
  
                      "/usr/local/xuggler/share/ffmpeg/libx264-ultrafast.ffpreset",
  
                      inputStream, outputStream };

• How can we reduce the size of audio file after uploading ?

  8 novembre 2019, par Arjun Pujari

  I have used this command in the terminal to install the package : composer require pbmedia/laravel-ffmpeg. The package is successfully downloaded, but I don’t know how to use it. I don’t even know if this package can also reduce the audio file size or not.

  Anyone know any other library or package ?

      
  
          <form action="{{route('upload')}}" method="post" enctype="multipart/form-data">
  
              Select Audio to upload:
  
              <input type="file" />
  
              <input type="submit" value="upload MP3" />
  
          </form>
  
      
  
  
  
  
  
  &lt;?php

  Here is my controller. Write basic code for save file :

  namespace App\Http\Controllers;
  
  
  
  use Illuminate\Http\Request;
  
  use Pbmedia\LaravelFFMpeg\FFMpeg;
  
  
  
  class FileCompress extends Controller
  
  {   
  
      public function compressFile(Request $request)
  
      {
  
            $uploadFileName = mt_rand().time(). '.' . $file->getClientOriginalExtension();
  
            $filetype = substr($file->getClientMimeType(), 0, strpos($file->getClientMimeType(), "/"));
  
  
  
          if($filetype == 'video'){
  
  
  
            $localpath =  public_path().'/videos/'.$uploadFileName;
  
           //code for video file compress.
  
          }else{
  
            //code for audio file compress.
  
          }
  
      }
  
  }

  But I need to reduce the audio file size when a file is uploaded or reduce the file size immediately after the file upload. How can i do that ?