I try to convert m3u8 file to WebM using ffmpeg and stream it onto browser.
I want it to play on browser without using any javascript.
Stream video method:

 public void streamVideo(OutputStream os ){

       String url = "m3u8file.m3u8";


        byte[] bytes = new byte[BUFFER];
        int bytesRead = -1;

        ProcessBuilder pb = new ProcessBuilder(
                "ffmpeg",
                "-i", url,
                "-c:v", "libvpx-vp9",  
                "-b:v", "1M",           
                "-c:a", "libopus",      
                "-b:a", "128k",
                "-f", "webm",           
                "pipe:1"                
        );
        pb.redirectErrorStream(true);

        try {
                    Process process = pb.start();
            try (
                    InputStream is = process.getInputStream()){

                while((bytesRead = is.read(bytes)) != -1){
                    os.write(bytes, 0 , bytesRead);
                    os.flush();
                }


            }catch (IOException ex){
                ex.printStackTrace();
            }


        }catch (IOException ex){
            ex.printStackTrace();
        }



    }


}

Web Controller

 
 @Autowired
    private VideoService videoService;

    @GetMapping("/stream")
    public ResponseEntity<StreamingResponseBody> streamVideo(@RequestHeader(value = "Range", required = false) String rangeHeader) {
        HttpHeaders headers = new HttpHeaders();

        headers.add("Content-Type", "video/webm");
        headers.add("Accept-Ranges", "bytes");

        StreamingResponseBody responseStream  = os ->{
            videoService.streamVideo(os);
        };
        return new ResponseEntity<>(responseStream, headers, HttpStatus.PARTIAL_CONTENT);
    }

When I open the /stream I get an error on spring application

“ServletOutputStream failed to flush: java.io.IOException: An established connection was aborted by the software in your host machine”

• On firefox in console I got 2 errors
  Cant decode multimedia resource:
  And Cant decode multimedia resource:Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)
  And the window which video will be showing says “No video with supported format and MIME type found”

• On Chrome just nothing happens

• And on firefox when i open the view-source i see the stream information and then there is jibberish which i suppose are bytes from the video the. The jibberish stops when i got the ServletOutputStream failed to flush: in console in Spring

Sorry if error codes translation is hard to understand