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• How can I transcode a file with FFMPEG and stream the output file in the response of a Java servlet ?

  6 octobre 2012, par user1700589

  Basically, this is what I'm trying to do :
  1. User passes a URL as a GET parameter to my servlet.
  2. Servlet uses a ProcessBuilder to convert the media contained in that URL to a valid media format (ie : MP3).
  3. The servlet streams the output file being transcoded by FFMPEG back to the browser.

  1 and 2 work fine, but it is 3 I am having a problem with. The best I can do is create a FileInputStream to the output file being transcoded and send that as the response but it is not working. My guess is that it is because the file is being written as I'm trying to stream it.

  Is there anyway to intercept the output file argument in FFMPEG and read it into an InputStream ? In my mind it does not seem that it should be difficult to take input file A, transcode it to output file B, and then stream output file B back to the client, on the fly.

  ProcessBuilder pb = new ProcessBuilder("ffmpeg.exe", "-i", url, "file.mp3");
  
      Process p = pb.start();
  
  
  
      final InputStream inStream = p.getErrorStream();
  
  
  
      new Thread(new Runnable() {
  
  
  
      public void run() {
  
              InputStreamReader reader = new InputStreamReader(inStream);
  
              Scanner scan = new Scanner(reader);
  
              while (scan.hasNextLine()) {
  
                  System.out.println(scan.nextLine());
  
              }
  
          }
  
      }).start();
  
  
  
      ServletOutputStream stream = null;
  
      BufferedInputStream buf = null;
  
      try {
  
  
  
          stream = response.getOutputStream();
  
          File mp3 = new File(file.mp3");
  
  
  
          //set response headers
  
          response.setContentType("audio/mpeg");
  
  
  
          response.addHeader("Content-Disposition", "attachment; filename=file.mp3");
  
  
  
          response.setContentLength(-1);
  
  
  
          //response.setContentLength((int) mp3.length());
  
  
  
          FileInputStream input = new FileInputStream(mp3);
  
          buf = new BufferedInputStream(input);
  
          int readBytes = 0;
  
          //read from the file; write to the ServletOutputStream
  
          while ((readBytes = buf.read()) != -1) {
  
              stream.write(readBytes);
  
          }
  
      } catch (IOException ioe) {
  
          throw new ServletException(ioe.getMessage());
  
      } finally {
  
          if (stream != null) {
  
              stream.close();
  
          }
  
          if (buf != null) {
  
              buf.close();
  
          }
  
      }

• Convert m3u8 file to mp4 file in React Native Expo

  19 mai 2024, par DRx

  How can I convert m3u8 file to mp4 file in React Native Expo ?
I have tried to convert m3u8 file to mp4 using FFmpegKit but I have this errors :

  


  'Cannot read property 'getLogLevel' of null' and 'Cannot read property 'ffmpegSession' of null'

  


  Also building with this package failing (Could not determine the dependencies of task ':ffmpeg-kit-react-native:compileDebugAidl'.).

  


  Is there a simple and easy way to convert m3u8 file in React Native Expo ?

  


  Code I have used :

  


  import { FFmpegKit } from 'ffmpeg-kit-react-native';
export async function converterToMp4() {
    try {
        await FFmpegKit.executeAsync(`-i ${m3u8FileUri} ${mp4FileUri}`)

    } catch(err) {
        console.log(err)
    }
}


  


• My srt file includes positioning formatting, but I lose this when embeding into mp4 file with ffmpeg

  15 mars 2023, par Dzseti

  I am trying to embed an srt subtitle file with subtitle positioning into an mp4 file using ffmpeg.

  


  Is this possible ? Every time I try I lose the positioning formatting.