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• How to increase video encoding speed in ffmpeg ?

  16 octobre 2017, par Ashutosh Tiwari

  I am recording video clips and then joining all the clips in a final video.
  Everything goes fine but the joining process takes too long.

  Tried to using some ffmpeg filters from here :
  https://trac.ffmpeg.org/wiki/Encode/H.264

  And here is my ffmpeg command that I am using to increase the speed (which seems to be wrong) :

  command = new String[]{"-y",
  
                  "-f",
  
                  "concat",
  
                  "-safe",
  
                  "0",
  
                  "-i",
  
                  "/storage/emulated/0/DCIM/my_file.txt",
  
                  "-c:v",
  
                  "-preset",
  
                  "fast",
  
                  "-crf",
  
                  "22",
  
                  "copy",
  
                  "-flags",
  
                  "+global_header",
  
                  "/storage/emulated/0/DCIM/SampleApp/" + videoOutputPath
  
          };

  Please help ! Thanks much.

• Evolution #3431 : Logo de SPIP plus gros

  23 mai 2015, par tetue tetue

  J’ai trouvé celui-ci qui traînait sur mon ordi : http://romy.tetue.net/squelettes/img/promo/spip.png mais j’espère que l’un·e d’entre nous a mieux.

  Il y a aussi celui-ci, sur Wikimédia : http://commons.wikimedia.org/wiki/File:Logo_spip.jpg

• Is there a way to calculate a average bitrate of video stream for each second ? Using ffmpeg or gsteamer toolkits [closed]

  15 mai 2012, par IOException

  I've encoded some video sample by different x264 presets. I already gathered some metric for each preset's file sample (PSNR,SSIM http://en.wikipedia.org/wiki/Structural_similarity)
  Now I am curious in instant (every seconds) file sample's bitrate, to compare them.

  I found out simple solution by googling around :

  http://akuvian.org/src/mplayer/avi_bitrate.pl
  This works on AVI files (regardless of codec), so you'd have to remux it first.
  Requires perl, mplayer, and gnuplot.

  I works for me