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• avcodec/vaapi : increase av1 decode pool size

  12 octobre 2021, par Fei Wang

  avcodec/vaapi : increase av1 decode pool size
  For film grain clip, vaapi_av1 decoder will cache additional 8
  
  surfaces that will be used to store frames which apply film grain.
  
  So increase the pool size by plus 8 to avoid leak of surface.
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  

  • [DH] libavcodec/vaapi_decode.c

• how use pipe instead of save method in fluent-ffmpeg ?

  27 juin 2019, par Mohsen Rahnamaei

  I gonna use fluent ffmpeg to write something on video
  I use this cod

  var proc = ffmpeg(req.filePath). videoFilters(
  
    {
  
      filter: 'drawtext',
  
      options: {
  
        text: 'VERY LONG TEXT VERY VERY VERY VERY LOL!!!',
  
        fontsize: 36,
  
        fontcolor: 'white',
  
        x: '(main_w/2-text_w/2)',
  
        y: '(text_h/2)+15',
  
        shadowcolor: 'black',
  
        shadowx: 2,
  
        shadowy: 2
  
      }}
  
  
  
  )
  
  // use the 'flashvideo' preset (located in /lib/presets/flashvideo.js)
  
  .on('end', function() {
  
    console.log('file has been converted succesfully');
  
  })
  
  .on('error', function(err) {
  
    console.log('an error happened: ' + err.message);
  
  }).save('/home/gheidar/Desktop/ffmpeg_test/rt.ts');

  and everything is correct
  but I want to export this output to stream for the response of the request
  means that I want to use pipe() instead of save method

  something like this :

  var proc = ffmpeg(req.filePath). videoFilters(
  
    {
  
      filter: 'drawtext',
  
      options: {
  
        text: 'VERY LONG TEXT VERY VERY VERY VERY LOL!!!',
  
        fontsize: 36,
  
        fontcolor: 'white',
  
        x: '(main_w/2-text_w/2)',
  
        y: '(text_h/2)+15',
  
        shadowcolor: 'black',
  
        shadowx: 2,
  
        shadowy: 2
  
      }}
  
  
  
  )
  
  // use the 'flashvideo' preset (located in /lib/presets/flashvideo.js)
  
  .on('end', function() {
  
    console.log('file has been converted succesfully');
  
  })
  
  .on('error', function(err) {
  
    console.log('an error happened: ' + err.message);
  
  }).pipe(res)

  its just change in the last line
  and I get this error :

  an error happened: ffmpeg exited with code 1: pipe:1: Invalid argument

  how can export this ffmpeg command to stream response ????

• How to set FFmpeg to send a signal to java code when it's done with its job ?

  23 juin 2016, par Elaheh

  I have a java servlet which waits for an httprequest, when it arrives, it calls the FFmpeg to do mixing two videos. Java code needs to send the mixed video back to the requester when the FFmpeg finished its job.
  How can I set the FFmpeg to inform the java servlet when the mixed video is ready ?
  My code in current shape, starts sending the video while FFmpeg is not completely done.

  I can use thread.sleep() or similar methods, but since we need to measure the processing time for a research work, I cannot use that.

  I appreciate if you can help me on this.
  this is part of the code :

  String videoId=req.getParameter("id");         
  
           String ad= "/var/Videos/ads/angrybirds-adv.mp4";  
  
           String url="http://"+RequesterIP+"/"+videoId;
  
           System.out.println("url: "+url);
  
           String output= new SimpleDateFormat("yyyyMMddhhmm'.mp4'").format(new Date());
  
           String videoPath = "/var/Videos/"+output;
  
           List<string> cmds =  new ArrayList&lt;>();
  
           cmds.add("ffmpeg");
  
           cmds.add("-i");
  
           cmds.add(url);
  
           cmds.add("-i");
  
           cmds.add(ad);
  
           cmds.add("-filter_complex");
  
           cmds.add("[0:v][1:v] overlay");
  
           cmds.add(videoPath);
  
           ProcessBuilder pb = new ProcessBuilder(cmds);
  
           Process p = pb.start();
  
  
  
           /** Terminal **/
  
         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();       
  
  
  
  // send the mixed video to the requester
  
  File downloadFile = new File(videoPath);
  
  ...
  
  </string>

  More details :
  the ad video is the overlay video located in the same machine as FFmpeg, the original video is located on a public folder in the requester machine, and is accessible using this url : http://requester-IP/videoId