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• How to successfully decode ffmpeg frames with http timeouts without parsers

  28 août 2019, par igal k

  I’m facing a scenario where connectivity issues cause ffmpeg generate false / messed artifacts(frames) contrary to what the manual states.

  We use curl as our http transmitting library and ffmpeg as the processing library. To simulate network timeouts, I place several breakpoints in the AVIOContext which is passed to the AVFormatContext

  avformat_open_input('http://some.com/1.ts')
  
  while(!eof)
  
    av_read_frame
  
    av_send_packet
  
    while(!av_receive_frame)
  
       do_something
  
  close

  av_receive_frame should either return 0 upon success or error -35 for cases where additional data is needed.

  So after timeout-ing the session, ffmpeg can still somehow extract (av_receive_frame) the first frame even though it hadn’t have the chance to download / accumulate enough data.

  

  My question, without using parsers is there a way to validate that the decoder can successfully decode the packet ?

  "EDIT" : i saw that av_read_frame use parsing if AVStream::need_parsing attribute is anything than NONE, any ideas on how setting it up ?

• ffmpeg converting MOV to MP4 add 5 second still frames to start of video [closed]

  17 février 2013, par Webfox

  I have a website that automatically converts MOV files to MP4. For some reason the client videos (which are exported from their own software) have about 5-8 seconds worth of a still frame added to the beginning of each video when they are converted. I have tried so many different variations trying to sort this but its always the same.

  The function/ffmpeg command that is currently being used is

      public function convertToMP4($file, $destination, $size=null, $qscale='10', $rate=25, $ab='192k', $ar=44100) {
  
      if (substr($destination, -1) == '/') {
  
          $destination = substr($destination, 0, -1);
  
      }
  
  
  
      $filename = end(explode("/", $file));
  
      $outfile = current(explode(".", $filename)).".mp4";
  
  
  
      // Media Size
  
      if (!isset($size) || $size == 'copy') {
  
          if ($dims = $this->getDimensions($file)) {
  
              $size = $dims['width'].'x'.$dims['height'];
  
          }
  
      }
  
      if ($ab == false) {
  
          $cmd = "ffmpeg -i $file -qscale $qscale -an -f mp4 -s $size -aspect 16:9 $destination/$outfile";
  
      } else {
  
          $cmd = "ffmpeg -i $file -acodec ".$this->mp3lib." -qscale $qscale -r $rate -ar $ar -ab $ab -f mp4 -s $size -aspect 16:9 $destination/$outfile";
  
      }
  
  
  
      $ret = shell_exec($cmd);
  
  
  
      if (file_exists("$destination/$outfile")) {
  
          return "$destination/$outfile";
  
      }
  
      return false;
  
  }

  where if $ab is false then remove the sound which is the case for 99% of the videos in scenario

  Thanks

• ffmpeg - need help removing motion trails appearing on moving objects [closed]

  24 octobre 2024, par Patrick

  Need some guidance. I'm not much of a unix guy and I know very little about ffmpeg.
Trying to stream a handful of cameras to YT. It's working but this screenshot shows the results.
It's not constant, it comes and goes. I'll provide the ffprobe for one of the cams as well as the command line I am using.

  


  ffprobe rtsp ://5fca316e7c40f.streamlock.net:1935/live-secure/M070EBIPC-21-LQ.stream
Input #0, rtsp, from 'rtsp ://5fca316e7c40f.streamlock.net:1935/live-secure/M070EBIPC-21-LQ.stream' :
Metadata :
title : M070EBIPC-21-LQ.stream
Duration : N/A, start : 5.266333, bitrate : N/A
Stream #0:0 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1024x576 [SAR 1:1 DAR 16:9], 15 fps, 15 tbr, 90k tbn, 30 tbc

  


  ffmpeg -f lavfi -i anullsrc -stream_loop -1 -i rtsp ://5fca316e7c40f.streamlock.net:1935/live-secure/M070EBIPC-21-LQ.stream -s 1024x576 -loop 1 -r 8 -tune zerolatency -vcodec libx264 -c:v copy -c:a mp3 -pix_fmt yuvj420p -g 2 -strict experimental -b:v 705000k -flvflags no_duration_filesize -f flv rtmp ://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx-xxxx

  


  I've tried searching for help, but I understand each camera and scenario is different.