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• ffmpeg, get rid of visible blocks with better compression rates

  7 octobre 2018, par Deex

  I did some research for ffmpeg and compared different encoder, also CRF rates. As i found out the best results in my case are CRF 20, with X265. But there is one problem with it, CRF20 took way to much disk space in a range of an year. CRF25 is saving a lot of space but there are visible blocks in a poor quality (see example image below)

  

  So what i seek for are ideas how to save more disk space while preserving image quality and lower the count of visible blocks. I already tested AV1 or VP9 but the encoding speed is way to slow.

  My current code is

  ffmpeg -f concat -safe 0 -i D:\-=streaming=-\concats\convertme\index.txt -y -preset slow -c:v libx265 -crf 20 -r 60 -movflags +faststart -c:a ac3 -b:a 320k D:\-=streaming=-\concats\x265-website23_slow.mp4

  I currently read about the pixel formats because I use a lot of comic style, but wasn’t able to find a good comparison or explanation what will happen with other formats.

• Evolution #4086 (En cours) : Exception pour le proxy

  28 septembre 2018, par cedric -

  Le code initial est censé chercher $host et $domain dans la variable $http_noproxy qui peut contenir 1 ou plusieurs host ou domaines.

  En relisant le code je ne vois pas ce qui serait faux dans ce code, et pour le coup avoir un exemple précis d’un cas reproductible qui ne marche pas aurait permis de trouver un bug potentiel.
  Le code que tu proposes ne traite que le cas ou $http_noproxy ne contient qu’un seul host ou domaine et n’est donc pas acceptable.

  Donne nous au moins un exemple précis avec des valeurs de $http_noproxy et de $host pour lesquelles ça ne marche pas et on fera évoluer le code pour corriger si on reproduit.
  Pour le besoin de prendre en compte tous les domaines parents et pas seulement le domaine parent principal je note mais du coup c’est une évolution.

• ffmpeg stream encoding out produce a stream shows different program on each start

  15 octobre 2018, par Ryan Philip

  I am using ffmpeg for almost one year, my stream recently started behaving badly.

  The lines on ffmpeg screen started running crazy fast when restreaming it, causing more CPU (with no encoding). I have mapped the stream to select only one stream. But the problem is even with mapping I am getting different program each time when it is played.

  Also each program it is playing for less than a minute. There is no specific error message showing on ffmpeg screen. Only the output is behaving badly.

  I even tried ffmpeg version 3.3, 3.4 and 4.0 with same results.

  It has so many resolution streams, so i selected only 33 (video) and 34 (audio), the ones with highest resolution.

  ffmpeg -i "http://insourceip/stream.m3u8" -err_detect explode  -c copy -map 0:33? -map 0:34?  -hls_time 10 -hls_list_size 6 -hls_wrap 10 -start_number 1 out/music.m3u8

  Please help me with this.

  Below is the output : the one after (No longer receiving playlist 8) start running crazy when started.

  Program 11
  
      Metadata:
  
        variant_bitrate : 1088000
  
      Stream #0:33: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x480 [SAR 12:11 DAR 16:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Metadata:
  
        variant_bitrate : 1088000
  
      Stream #0:34: Audio: aac (LC) ([15][0][0][0] / 0x000F), 32000 Hz, stereo, fltp
  
      Metadata:
  
        variant_bitrate : 1088000
  
      Stream #0:35: Data: timed_id3 (ID3  / 0x20334449)
  
      Metadata:
  
        variant_bitrate : 1088000
  
  [hls @ 0x7a64120] Opening '/music1.ts' for writing
  
  Output #0, hls, to '/music.m3u8':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 640x480 [SAR 12:11 DAR 16:11], q=2-31, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
      Metadata:
  
        variant_bitrate : 1088000
  
      Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 32000 Hz, stereo, fltp
  
      Metadata:
  
        variant_bitrate : 1088000
  
      Stream #0:2: Data: timed_id3 (ID3  / 0x20334449)
  
      Metadata:
  
        variant_bitrate : 1088000
  
  Stream mapping:
  
    Stream #0:33 -> #0:0 (copy)
  
    Stream #0:34 -> #0:1 (copy)
  
    Stream #0:35 -> #0:2 (copy)
  
  Press [q] to stop, [?] for help
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 10
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 1
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 3
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 5
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 7
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 9
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 0
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 2
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 4
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 6
  
  [hls,applehttp @ 0x3d57120] No longer receiving playlist 8
  
  ***[hls,applehttp @ 0x3d57120] Opening 'FORMATED/i/MUSIC_1@13394/segment153957897_1_av-b.ts' for reading
  
  [hls,applehttp @ 0x3d57120] Opening 'FORMATED/i/MUSIC_1@13394/segment153957898_1_av-b.ts' for reading
  
  [hls @ 0x7a64120] Opening '/music2.ts' for writing
  
  [hls @ 0x7a64120] Opening '/music.m3u8.tmp' for writing
  
  [hls,applehttp @ 0x3d57120] Opening 'FORMATED/i/MUSIC_1@13394/segment153957899_1_av-b.ts' for reading
  
  [hls @ 0x7a64120] Opening '/music3.ts' for writing***