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• FFplay show time when cursor is active

  7 janvier 2018, par Slump 64

  So recently I’ve found solution to make my ffplay display time at the bottom of the video playing

  ffplay -vf "drawtext=text='%{pts\:hms}':box=1:x=(w-tw)/2:y=h-(2*lh)"

  Can I make it show time only if I use cursor and then show nothing when cursor is fading or when I press SPACE ?

  Edit : OR show how much time out of total is played, or even a percentage.

• Streaming converted movie with mp4 container in NodeJS, movie playing very fast

  20 septembre 2016, par Mustafa

  I have used stream-transcoder module to convert a file make it a stream. So the file is not stored, it is on the fly.

  app.get("/video", function(req,res){
  
      res.writeHead(200, {'Content-Type': 'video/mp4'});
  
      var src = "movie.avi";
  
  
  
      var Transcoder = require('stream-transcoder');
  
      var stream = fs.createReadStream(src);
  
      new Transcoder(stream)
  
          .maxSize(1280, 720)
  
          .videoCodec('h264')
  
          .videoBitrate(800 * 1000)
  
          .fps(25)
  
          .sampleRate(44100)
  
          .channels(2)
  
          .audioBitrate(128 * 1000)
  
          .format('mp4')
  
          .on('finish', function() {
  
              console.log("finished");
  
          })
  
          .stream().pipe(res);
  
  });

  It works nicely, it is fast, but too fast, the audio is played at the same speed, however the video does not respect the frame rate, whatever is recieved from ffmpeg is immeidately shown, fastly. Additionally, it does not show the total time, I believe it is the problem. I need to somehow specify the length, framerate, but I could not find enough information on that. I thought the stream recieved from ffmpeg should contain that. And I could not find respective headers for that in HTTP.

  Here are the flags that this stream-transcoder module uses for MP4 :

  [ '-i',
  
    '-',
  
    '-vf',
  
    'scale=min(trunc(1280/hsub)*hsub\\,trunc(a*720/hsub)*hsub):min(trunc(720/vsub)*vsub\\,trunc(1280/a/vsub)*vsub)',
  
    '-vcodec',
  
    'h264',
  
    '-b:v',
  
    800000,
  
    '-r',
  
    25,
  
    '-ar',
  
    44100,
  
    '-ac',
  
    2,
  
    '-ab',
  
    128000,
  
    '-f',
  
    'mp4',
  
    '-movflags',
  
    'frag_keyframe+faststart',
  
    'pipe:1' ]

  When I use VP8 encoder and WebM, it works nicely, the time is displayed, video plays normal speed.

• vp9/x86 : add ff_vp9_loop_filter_[vh]_16_16_ssse3().

  5 janvier 2014, par Clément Bœsch

  vp9/x86 : add ff_vp9_loop_filter_[vh]_16_16_ssse3().
  16662 decicycles in loop_filter_h_16_16_c, 8387355 runs, 1253 skips
  
  17510 decicycles in loop_filter_v_16_16_c, 8387516 runs, 1092 skips
  4941 decicycles in ff_vp9_loop_filter_h_16_16_ssse3, 8387887 runs, 721 skips
  
  3899 decicycles in ff_vp9_loop_filter_v_16_16_ssse3, 8387980 runs, 628 skips
  Overall decode time goes from :
  
    ./ffmpeg -v 0 -nostats -threads 1 -i /samples/vp9/ped1080p.webm -f null -  8.10s user 0.02s system 99% cpu 8.126 total
  
  to :
  
    ./ffmpeg -v 0 -nostats -threads 1 -i /samples/vp9/ped1080p.webm -f null -  6.15s user 0.04s system 99% cpu 6.199 total
  (46 to 61 fps)
  

  • [DH] libavcodec/x86/Makefile
  • [DH] libavcodec/x86/vp9dsp_init.c
  • [DH] libavcodec/x86/vp9lpf.asm