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• Playing RDT (Real Data Transport) through FFmpeg without SDP file

  24 février 2021, par William Seemann

  I'm doing some research into how Roku delivers their private listening stream. I believe the RTSP stream is delivered via RDT and I'm able to view the packets in Wireshark. I can't play the stream using FFmpeg despite it supporting RDT/RTSP because a SDP file is required. Is it possible to generate this SDP file or play the stream without one ?

  


• Revision 46ea9ec719 : Enable real-time version reference motion vector search This commit enables a f

  24 juin 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_mvref_common.c

  
   Modify /vp9/common/vp9_mvref_common.h

  
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Enable real-time version reference motion vector search

  This commit enables a fast reference motion vector search scheme.
  It checks the nearest top and left neighboring blocks to decide the
  most probable predicted motion vector. If it finds the two have
  the same motion vectors, it then skip finding exterior range for
  the second most probable motion vector, and correspondingly skips
  the check for NEARMV.

  The runtime of speed -5 goes down
  pedestrian at 1080p 29377 ms -> 27783 ms
  vidyo at 720p 11830 ms -> 10990 ms
  i.e., 6%-8% speed-up.

  For rtc set, the compression performance
  goes down by about -1.3% for both speed -5 and -6.

  Change-Id : I2a7794fa99734f739f8b30519ad4dfd511ab91a5

• error in hls play video streaming with ffmpeg real time manipulation

  4 août 2019, par Mohsen Rahnamaei

  I am using fluent ffmpeg to write something on video streaming real-time
  means that I am using this tool to write text on every ts file which server wants to serve in order to response the hls request from client :
  in server iam using this code :

  res.setHeader('Content-Type', CONTENT_TYPE.SEGMENT)
  
  res.statusCode = 200
  
  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
  
        }
  
      }
  
  
  
    )
  
  
  
  
  
    .videoCodec('libx264')
  
  
  
    .audioCodec('aac')
  
  
  
  
  
    .format('mpegts')
  
  
  
    .on('end', function (stdout, stderr) {
  
  
  
      console.log('Transcoding succeeded !', req.filePath);
  
  
  
    })
  
  
  
    .on('error', function (err) {
  
      console.log('an error happened: ' + err.message);
  
    }).pipe(res, {
  
      end: true
  
    })

  but in client just play first ts file and after that, I get this log in the console :

  [log] > AVC:6798 ms overlapping between fragments detected
  
  blob:http://demo.jwp…a8dc-56b513684988:1 
  
  [log] > Video/PTS/DTS adjusted: 6798/6798,delta:-6798 ms
  
  blob:http://demo.jwp…a8dc-56b513684988:1 

  and a bunch of this log :

  [warn] > Dropping 1 audio frame @ 6.805s due to 6797 ms overlap.

  what should I do ?????