Newest 'libx264' Questions - Stack Overflow

Les articles publiés sur le site

• What is the difference between libx264 and h264_nvenc ?

  18 août 2019, par Jonathan Morrall

  I am trying to encode some videos but when I use the libx264 they don't work but change the codec to h264_nvenc and they play.

  If I change the profile to baseline when using the libx264 the videos play.

  what is the difference? I could use the h264_nvenc but I want to use the libx264 for the better quality for storage.

  My code

  bin\ffmpeg -i "Input-File" -c:v h264_nvenc -bf 3 -b_strategy 2 -temporal-aq 1 -rc-lookahead 20 -profile:v high -preset slow -rc vbr_hq -rc:v vbr_hq -qmin 0 -cq:v 19 -b:v 900k -maxrate:v 5000k -bufsize 2000K -c:a aac -ar 48000 -b:a 128k "Output-File.mp4"
  

• Why is x264 not found ?

  14 août 2019, par user11903678

  I want to enable in libav the h264 encoder so I downloaded the library libx264 and installed it statically. However the makefile generated in /lib and /include the .so, .h files for libx264, there is no x264.so file (only c files and header). When I pass the path to the configuration file for Libav it returns the error:

  ERROR: x264 not found

  If you think configure made a mistake, make sure you are using the latest version from Git. If the latest version fails, report the problem to the libav-tools@libav.org mailing list or IRC #libav on irc.freenode.net. Include the log file "config.log" produced by configure as this will help solving the problem.

  The command I used for configure is:

  ./configure --enable-static --prefix=/path_to_library/libav-12.3  --extra-ldflags='-L/path_to_library/libs/x264' --extra-cflags='-I//path_to_library/libs/x264 --static' --enable-libx264 --enable-gpl
  

• I can't use libx265 or hevc with ffmpeg in nginx

  15 juillet 2019, par Hakan Murat Aksüt

  exec_push /usr/bin/ffmpeg -re -i rtmp://10.254.20.186:1935/$app/$name ar 44100 -vcodec libx264 -g 25 -f flv rtmp://10.254.20.186/live/$name_hi;

  I can use this code in my nginx server. this is code running but dont run while write libx264 instead libx265. The interesting thing is that I can run the following commands on my linux computer without problems.

  ffmpeg -i input.mp4 -c:v libx264 -crf 28 -c:a aac -b:a 128k output.mp4 ffmpeg -i input.mp4 -c:v libx265 -crf 28 -c:a aac -b:a 128k output.mp4 ffmpeg -i input.mp4 -c:v hevc -crf 28 -c:a aac -b:a 128k output264tt.mp4 ffmpeg -i input.mp4 -c:v h264 -crf 28 -c:a aac -b:a 128k output264tt.mp4

• ffmpeg to hls not running correctly with error :Uncaught RangeError : Source is too large

  4 juillet 2019, par Mohsen Rahnamaei

  I want to add watermark in each video file which produce from hls server. inorder to do that I am using fluent ffmpeg js componnent. and this is my backend code of hls server

   self.provider.getSegmentStream(req, function (err, stream) {
  
  
  
  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')
  
   .audioBitrate('128k')
  
   .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})
  

  and in my client i am using this code:

  if(Hls.isSupported())
  {
    console.log('hls is suported');
      var video = document.getElementById('video');
      var hls = new Hls();
      hls.loadSource('http://serverip:8182/streams/stream.m3u8');
      hls.attachMedia(video);
      hls.on(Hls.Events.MANIFEST_PARSED,function()
      {
          video.play();
      });
  }
  else if (video.canPlayType('application/vnd.apple.mpegurl'))
  {
    console.log('hls isnot suported');
  
      video.src = 'http://serverip/streams/stream.m3u8';
      video.addEventListener('canplay',function()
      {
          video.play();
      });
  }
  

  but i have problem becaus its just play first ts file but after that hls has stoped and in console i get this error :

  Uncaught RangeError: Source is too large
  at Uint8Array.set ()
  at e.remuxAudio (blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1)
  at e.remux (blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1)
  at e.append (blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1)
  at e.pushDecrypted (blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1)
  at e.push (blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1)
  at blob:null/44d66ff1-a411-411b-842b-4904552a58a4:1
  

  what should i do

• Drop P-frame when decoding/encoding mp4 video

  27 juin 2019, par Dzmitry

  I'm decoding/encoding the same mp4 (video/mp4) file using ffmpeg (libAV library) + libx264 encoder. For example, the original video file contains 182 frames:

  [libx264 @ 0x7fb4a843ce00] frame I:2     Avg QP:17.95  size: 13834
  [libx264 @ 0x7fb4a843ce00] frame P:180   Avg QP:19.90  size:  6297
  

  but after the followig decoding/encoding I'm getting file contains 181 frames:

  [libx264 @ 0x7fb4ac421dc0] frame I:2     Avg QP:17.93  size: 13627
  [libx264 @ 0x7fb4ac421dc0] frame P:179   Avg QP:19.77  size:  5946
  

  I've already tried to change AVCodecContext gop_size/max_b_frames/priv_data (profile, preset, tune, x264opts) and I've also read these posts and tried to solve my problem:

  ffpmeg drops last frame when compressing from MP4 to MP4 (libx264)

  ffmpeg/libx264 C API: frames dropped from end of short MP4

  UPD: If I set framerate and timebase = 26/1 and 1/26 and more - frame doesn't drop.

  UPD2: Solved!

  //in function avformat_open_input() add AVDictionary *options:
  av_dict_set(&options, "r", "25", 0);
  av_dict_set(&options, "ignore_editlist", "1", 0);
  

  I expected decoding/encoding videos with all the frames (without changed parameters).