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• avutil/mem : Correct documentation of av_fast_*alloc(z)

  18 novembre 2018, par Andreas Rheinhardt

  avutil/mem : Correct documentation of av_fast_*alloc(z)
  The current wording regarding size and min_size is completely wrong and
  
  ignores that min_size is indeed only a desired minimal size, not the
  
  actually allocated size.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavutil/mem.h

• ffmpeg mp4 to hls vod with extract segment duration without re-encoding

  11 juillet 2021, par Jeremy

  Hello I have h264 mp4 files. What I want to do is convert it to hls without re-encoding. This can be achieve by :

  


  ffmpeg -i input.mp4 -c copy -force_key_frames "expr:gte(t,n_forced*4)" -hls_time 4 -hls_playlist_type vod -hls_segment_type mpegts vid.m3u8


  


  But this problem with this is that it doesn't create extract segment duration :

  


  $ for f in *.ts; do echo -n "$f,"; ffprobe -v error -show_entries format=duration -sexagesimal -of csv=p=0 "$f"; done
vid0.ts,0:00:04.837700
vid1.ts,0:00:05.587200
vid2.ts,0:00:06.006200
vid3.ts,0:00:01.368200
vid4.ts,0:00:02.693867


  


  I don't believe I can't insert keyframes without encoding.

  


  When I run :

  


  ffmpeg -i input.mp4 -codec:v libx264 -force_key_frames "expr:gte(t,n_forced*4)" -hls_time 4 -hls_playlist_type vod -hls_segment_type mpegts vid.m3u8


  


  its works but this is resource intensive as it re-encode the video.

  


  So I am looking for the best way to achieve this while using minimal resource as possible.

  


• Playing RTSP in WPF application with low latency using FFMediaElement (FFME)

  17 août 2018, par Paboka

  I’m trying to use FFMediaElement (FFME, WPF MediaElement replacement based on FFmpeg) component to play RSTP live video in my WPF application.

  I have a good connection to my camera and I want to play it with minimum available latency.

  I’ve reduced the latency by changing ProbeSize to its minimal value :

  private void Media_OnMediaInitializing(object Sender, MediaInitializingRoutedEventArgs e)
  
  {
  
    e.Configuration.GlobalOptions.ProbeSize = 32;
  
  }

  But I still have about 1 second of latency since the very beginning of the stream. I mean, when I start playing, I have to wait for 1 second till the video appears and then I have 1s of latency.

  I’ve also tried to change following parameters :

  e.Configuration.GlobalOptions.EnableReducedBuffering = true;
  
  e.Configuration.GlobalOptions.FlagNoBuffer = true;
  
  e.Configuration.GlobalOptions.MaxAnalyzeDuration = TimeSpan.Zero;

  but it gave no result.

  Is there any parameter of FFME or FFmpeg I`ve missed ?