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• FFMPEG equalizer clipping audio despite low volume

  23 juillet 2023, par Tom

  I'm using ffmpeg to equalise audio transferred from historic gramophone records, using standard eqs of the era.

  


  The frequency and gain values are taken from the graphic eq settings listed on the Audacity website - https://plugins.audacityteam.org/additional-resources/eq-curves/playback-equalization-for-78-rpm-shellacs-and-early-33-lps

  


  An example of the Blumlien300 curve here - https://2850314611-files.gitbook.io/ /files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FklCVENFte0GRy5IqVz0W%2Fuploads%2FJHS6Mv121GX1h898xy4K%2FBlumlein300_3.2.2.txt?alt=media&token=8d04df05-366d-47f8-8c82-149fa5eda59a

  


  The audio file I'm testing with has a digital peak of -35db, the highest gain value applied on this eq is 17db. When I run the ffmpeg command though, it reports the audio is clipping and the result is a horribly distorted recording.

  


  Can anyone advise why this is happening ? I run the same file through the same eq settings in Audacity and the result is as expected.

  


  set eq="equalizer=f=22050:g=-0.4,equalizer=f=21203.720228928225:g=-0.4,equalizer=f=20389.920705063967:g=-0.4,equalizer=f=19607.354835383569:g=-0.4,equalizer=f=18854.823871147240:g=-0.4,equalizer=f=18131.175071633737:g=-0.4,equalizer=f=17435.299938351014:g=-0.4,equalizer=f=16766.132517017904:g=-0.4,equalizer=f=16122.647764715837:g=-0.4,equalizer=f=15503.859979709296:g=-0.4,equalizer=f=14908.821291529812:g=-0.4,equalizer=f=14336.620209010769:g=-0.4,equalizer=f=13786.380224048187:g=-0.4,equalizer=f=13257.258468950000:g=-0.4,equalizer=f=12748.444425315412:g=-0.4,equalizer=f=12259.158682468413:g=-0.4,equalizer=f=11788.651743541806:g=-0.4,equalizer=f=11336.202877384472:g=-0.4,equalizer=f=10901.119014532051:g=-0.4,equalizer=f=10482.733685550458:g=-0.4,equalizer=f=10080.406000125797:g=-0.4,equalizer=f=9693.519665336817:g=-0.4,equalizer=f=9321.482041606178:g=-0.4,equalizer=f=8963.723234884175:g=-0.4,equalizer=f=8619.695223674737:g=-0.4,equalizer=f=8288.871019565895:g=-0.4,equalizer=f=7970.743859979441:g=-0.4,equalizer=f=7664.826431902562:g=-0.4,equalizer=f=7370.650125412990:g=-0.4,equalizer=f=7087.764315853595:g=-0.4,equalizer=f=6815.735673557399:g=-0.4,equalizer=f=6554.147500065165:g=-0.4,equalizer=f=6302.599089819104:g=-0.4,equalizer=f=6060.705116354743:g=-0.4,equalizer=f=5828.095042050793:g=-0.4,equalizer=f=5604.412550532827:g=-0.4,equalizer=f=5389.315000861326:g=-0.4,equalizer=f=5182.472902668021:g=-0.394052055589,equalizer=f=4983.569411436476:g=-0.386751590389,equalizer=f=4792.299843153906:g=-0.376185664074,equalizer=f=4608.371207590573:g=-0.362543760251,equalizer=f=4431.501759492006:g=-0.345993198097,equalizer=f=4261.420566996452:g=-0.330710126890,equalizer=f=4097.867096616487:g=-0.318503033191,equalizer=f=3940.590814149046:g=-0.309564283335,equalizer=f=3789.350800902538:g=-0.303741189604,equalizer=f=3643.915384653179:g=-0.300601888512,equalizer=f=3504.061784765236:g=-0.3,equalizer=f=3369.575770931567:g=-0.3,equalizer=f=3240.251335011708:g=-0.3,equalizer=f=3115.890375464830:g=-0.3,equalizer=f=2996.302393894170:g=-0.3,equalizer=f=2881.304203238093:g=-0.3,equalizer=f=2770.719647160795:g=-0.3,equalizer=f=2664.379330212802:g=-0.3,equalizer=f=2562.120358347913:g=-0.3,equalizer=f=2463.786089399117:g=-0.3,equalizer=f=2369.225893131248:g=-0.3,equalizer=f=2278.294920502843:g=-0.3,equalizer=f=2190.853881783698:g=-0.3,equalizer=f=2106.768833188346:g=-0.296437432785,equalizer=f=2025.910971698469:g=-0.290217913930,equalizer=f=1948.156437760116:g=-0.280922418484,equalizer=f=1873.386125553329:g=-0.268550946447,equalizer=f=1801.485500543704:g=-0.253103497820,equalizer=f=1732.344424036255:g=-0.235614749092,equalizer=f=1665.856984462975:g=-0.218076286078,equalizer=f=1601.921335145533:g=-0.200537822606,equalizer=f=1540.439538284674:g=-0.184632657170,equalizer=f=1481.317414937308:g=-0.168779161348,equalizer=f=1424.464400751469:g=-0.152925665153,equalizer=f=1369.793407238189:g=-0.137072168707,equalizer=f=1317.220688367753:g=-0.121218672255,equalizer=f=1266.665712285991:g=-0.105365175802,equalizer=f=1218.051037954117:g=-0.088396941462,equalizer=f=1171.302196523118:g=-0.070858476440,equalizer=f=1126.347577261013:g=-0.053320011417,equalizer=f=1083.118317858216:g=-0.034770724190,equalizer=f=1041.548198942992:g=-0.013200571808,equalizer=f=1001.573542645411:g=0.011445558081,equalizer=f=963.133115054414:g=0.039167665478,equalizer=f=926.168032418592:g=0.069965750383,equalizer=f=890.621670946974:g=0.103839812794,equalizer=f=856.439580071665:g=0.140789852714,equalizer=f=823.569399039473:g=0.180815870141,equalizer=f=791.960776704742:g=0.223158863450,equalizer=f=761.565294400547:g=0.266149082252,equalizer=f=732.336391770094:g=0.311823093692,equalizer=f=704.229295444710:g=0.360237839089,equalizer=f=677.200950459179:g=0.413174176689,equalizer=f=651.209954299352:g=0.471478099167,equalizer=f=626.216493481026:g=0.535493496953,equalizer=f=602.182282562909:g=0.606978871276,equalizer=f=579.070505500287:g=0.684199304160,equalizer=f=556.845759249530:g=0.767096732395,equalizer=f=535.473999537060:g=0.853776460170,equalizer=f=514.922488709709:g=0.943323717867,equalizer=f=495.159745586582:g=1.036571598687,equalizer=f=476.155497235608:g=1.135335711982,equalizer=f=457.880632600910:g=1.237175803242,equalizer=f=440.307157909949:g=1.342335109599,equalizer=f=423.408153792158:g=1.453088412615,equalizer=f=407.157734043353:g=1.569993670188,equalizer=f=391.531005972773:g=1.688508164136,equalizer=f=376.504032271996:g=1.808802987893,equalizer=f=362.053794347337:g=1.934465396527,equalizer=f=348.158157059540:g=2.065823830001,equalizer=f=334.795834816768:g=2.204891058267,equalizer=f=321.946358968944:g=2.352009664049,equalizer=f=309.590046453497:g=2.509552803849,equalizer=f=297.707969644483:g=2.678532979186,equalizer=f=286.281927358906:g=2.856115742576,equalizer=f=275.294416975809:g=3.041612670003,equalizer=f=264.728607625441:g=3.230723044219,equalizer=f=254.568314407418:g=3.422700948357,equalizer=f=244.797973598401:g=3.621312762050,equalizer=f=235.402618811295:g=3.826195809769,equalizer=f=226.367858069467:g=4.034154835453,equalizer=f=217.679851760848:g=4.246639157749,equalizer=f=209.325291438168:g=4.468048945659,equalizer=f=201.291379432825:g=4.698686666092,equalizer=f=193.565809251186:g=4.938552319047,equalizer=f=186.136746723276:g=5.187645904525,equalizer=f=178.992811874976:g=5.445967422525,equalizer=f=172.123061495972:g=5.712025685327,equalizer=f=165.516972376744:g=5.984236264250,equalizer=f=159.164425188922:g=6.258981796419,equalizer=f=153.055688984312:g=6.515823590632,equalizer=f=147.181406288853:g=6.777692051390,equalizer=f=141.532578768664:g=7.044587178695,equalizer=f=136.100553446236:g=7.314095599483,equalizer=f=130.877009445637:g=7.583605034445,equalizer=f=125.853945246444:g=7.853114469407,equalizer=f=121.023666426868:g=8.146285201135,equalizer=f=116.378773877299:g=8.444439101287,equalizer=f=111.912152466211:g=8.742593001439,equalizer=f=107.616960141075:g=9.042209423688,equalizer=f=103.486617447577:g=9.344900874707,equalizer=f=99.514797451091:g=9.650668303691,equalizer=f=95.695416044961:g=9.959511710641,equalizer=f=92.022622630759:g=10.271431095557,equalizer=f=88.490791156230:g=10.586541422511,equalizer=f=85.094511497198:g=10.906991735356,equalizer=f=81.828581170245:g=11.233594002758,equalizer=f=78.687997363448:g=11.556996378650,equalizer=f=75.667949272979:g=11.873211536187,equalizer=f=72.763810733831:g=12.194794278600,equalizer=f=69.971133133372:g=12.521192148224,equalizer=f=67.285638596875:g=12.846501740168,equalizer=f=64.703213434600:g=13.169127539473,equalizer=f=62.219901840358:g=13.492484068742,equalizer=f=59.831899831942:g=13.820346094285,equalizer=f=57.535549424116:g=14.145340590334,equalizer=f=55.327333025244:g=14.467659297988,equalizer=f=53.203868048980:g=14.789401139821,equalizer=f=51.161901732761:g=15.111142981226,equalizer=f=49.198306155165:g=15.437629968456,equalizer=f=47.310073444503:g=15.770860796927,equalizer=f=45.494311171305:g=16.104091624940,equalizer=f=43.748237917649:g=16.412536097232,equalizer=f=42.069179016527:g=16.579143834849,equalizer=f=40.454562454745:g=16.588876722789,equalizer=f=38.901914933067:g=16.461103901687,equalizer=f=37.408858077565:g=16.215674576171,equalizer=f=35.973104796389:g=15.850016386783,equalizer=f=34.592455776352:g=15.350234288456,equalizer=f=33.264796113983:g=14.615823142814,equalizer=f=31.988092075884:g=13.626809695512,equalizer=f=30.760387983412:g=12.332756508563,equalizer=f=29.579803216941:g=10.518513413063,equalizer=f=28.444529335092:g=8.346792732977,equalizer=f=27.352827304528:g=5.833681758551,equalizer=f=26.303024836072:g=3.097942665008,equalizer=f=25.293513823067:g=0.163604913582,equalizer=f=24.322747878043:g=-2.887748621210,equalizer=f=23.389239963935:g=-6.091081601564,equalizer=f=22.491560116216:g=-9.478973229620,equalizer=f=21.628333252442:g=-12.539218030638,equalizer=f=20.798237065887:g=-14.384804507659,equalizer=f=20:g=-15"
ffmpeg -i "File.wav" -af %eq% -c:a pcm_s24le out.wav


  


• Quick stream from file which exists

  4 mai 2017, par parsa

  I implement live streaming from mp4 video file which exists on the path with ffmpeg under hls format.
  When my video file have the quality greater than hd720 , in encoding there are so many delays for creating .ts fragments.
  I mean the .ts fragments slowly produced on my path,and because of it I have so many delays in showing the stream.
  Here is my ffmpeg code for streaming :

  ffmpeg -re -i 123.mp4 -s cga -f hls -hls_list_size 0 -c:v libx264 -c:a aac 200p/out.m3u8 
  
                -s nhd -f hls -hls_list_size 0 -c:v libx264 -c:a aac 360p/out.m3u8 
  
                -s hd480 -f hls -hls_list_size 0 -c:v libx264 -c:a aac 480p/out.m3u8 
  
                -s hd720 -f hls -hls_list_size 0 -c:v libx264 -c:a aac 720p/out.m3u8
  
                -s hd1080 -f hls -hls_list_size 0 -c:v libx264 -c:a aac 1080p/out.m3u8

  And here is the console output :

      ffmpeg -re -i ../files/412-887123464/video/412-887123464.mp4 -s cga -f hls -hls_list_size 0 -c:v libx264 -c:a aac ../fil
  
          es/412-887123464/video/200p/out.m3u8  -s nhd -f hls -hls_list_size 0 -c:v libx264 -c:a aac ../files/412-887123464/video/360p/out.m3u8 -s hd480 -f hls -
  
          hls_list_size 0 -c:v libx264 -c:a aac ../files/412-887123464/video/480p/out.m3u8 -s hd720 -f hls -hls_list_size 0 -c:v libx264 -c:a aac ../files/412-88
  
          7123464/video/720p/out.m3u8 -s hd1080 -f hls -hls_list_size 0 -c:v libx264 -c:a aac ../files/412-887123464/video/1080p/out.m3u8
  
          ffmpeg version N-82225-gb4e9252 Copyright (c) 2000-2016 the FFmpeg developers
  
            built with gcc 5.4.0 (GCC)
  
            configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --e
  
          nable-libebur128 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcac
  
          a --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-lib
  
          opencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr
  
           --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwa
  
          vpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zl
  
          ib
  
            libavutil      55. 35.100 / 55. 35.100
  
            libavcodec     57. 66.101 / 57. 66.101
  
            libavformat    57. 57.100 / 57. 57.100
  
            libavdevice    57.  2.100 / 57.  2.100
  
            libavfilter     6. 66.100 /  6. 66.100
  
            libswscale      4.  3.100 /  4.  3.100
  
            libswresample   2.  4.100 /  2.  4.100
  
            libpostproc    54.  2.100 / 54.  2.100
  
          Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../files/412-887123464/video/412-887123464.mp4':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.31.100
  
            Duration: 00:05:04.07, start: 0.000000, bitrate: 3108 kb/s
  
              Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 2976 kb/s, 25 fps, 25 tbr, 90k tbn, 50
  
          tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
              Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
          [libx264 @ 0000000001c53f00] using SAR=10/9
  
          [libx264 @ 0000000001c53f00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
          [libx264 @ 0000000001c53f00] profile High, level 1.3
  
          Output #0, hls, to '../files/412-887123464/video/200p/out.m3u8':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.57.100
  
              Stream #0:0(und): Video: h264 (libx264), yuv420p, 320x200 [SAR 10:9 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
                encoder         : Lavc57.66.101 libx264
  
              Side data:
  
                cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
              Stream #0:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
                encoder         : Lavc57.66.101 aac
  
          [libx264 @ 0000000001f87180] using SAR=1/1
  
          [libx264 @ 0000000001f87180] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
          [libx264 @ 0000000001f87180] profile High, level 3.0
  
          Output #1, hls, to '../files/412-887123464/video/360p/out.m3u8':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.57.100
  
              Stream #1:0(und): Video: h264 (libx264), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
                encoder         : Lavc57.66.101 libx264
  
              Side data:
  
                cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
              Stream #1:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
                encoder         : Lavc57.66.101 aac
  
          [libx264 @ 0000000001c55ba0] using SAR=640/639
  
          [libx264 @ 0000000001c55ba0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
          [libx264 @ 0000000001c55ba0] profile High, level 3.0
  
          Output #2, hls, to '../files/412-887123464/video/480p/out.m3u8':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.57.100
  
              Stream #2:0(und): Video: h264 (libx264), yuv420p, 852x480 [SAR 640:639 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
                encoder         : Lavc57.66.101 libx264
  
              Side data:
  
                cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
              Stream #2:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
                encoder         : Lavc57.66.101 aac
  
          [libx264 @ 0000000001ca0220] using SAR=1/1
  
          [libx264 @ 0000000001ca0220] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
          [libx264 @ 0000000001ca0220] profile High, level 3.1
  
          Output #3, hls, to '../files/412-887123464/video/720p/out.m3u8':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.57.100
  
              Stream #3:0(und): Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
                encoder         : Lavc57.66.101 libx264
  
              Side data:
  
                cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
              Stream #3:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
                encoder         : Lavc57.66.101 aac
  
          [libx264 @ 0000000001ca23e0] using SAR=1/1
  
          [libx264 @ 0000000001ca23e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
          [libx264 @ 0000000001ca23e0] profile High, level 4.0
  
          Output #4, hls, to '../files/412-887123464/video/1080p/out.m3u8':
  
            Metadata:
  
              major_brand     : isom
  
              minor_version   : 512
  
              compatible_brands: isomiso2avc1mp41
  
              encoder         : Lavf57.57.100
  
              Stream #4:0(und): Video: h264 (libx264), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
  
              Metadata:
  
                handler_name    : VideoHandler
  
                encoder         : Lavc57.66.101 libx264
  
              Side data:
  
                cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
              Stream #4:1(und): Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
              Metadata:
  
                handler_name    : SoundHandler
  
                encoder         : Lavc57.66.101 aac
  
          Stream mapping:
  
            Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
            Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
            Stream #0:0 -> #1:0 (h264 (native) -> h264 (libx264))
  
            Stream #0:1 -> #1:1 (aac (native) -> aac (native))
  
            Stream #0:0 -> #2:0 (h264 (native) -> h264 (libx264))
  
            Stream #0:1 -> #2:1 (aac (native) -> aac (native))
  
            Stream #0:0 -> #3:0 (h264 (native) -> h264 (libx264))
  
            Stream #0:1 -> #3:1 (aac (native) -> aac (native))
  
            Stream #0:0 -> #4:0 (h264 (native) -> h264 (libx264))
  
            Stream #0:1 -> #4:1 (aac (native) -> aac (native))
  
          Press [q] to stop, [?] for help
  
  frame= 7600 fps= 21 q=-1.0 Lq=-1.0 q=-1.0 q=-1.0 q=-1.0 size=N/A time=00:05:04.06 bitrate=N/A speed=0.835x
  
  video:294980kB audio:23995kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  [libx264 @ 0000000001d33f00] frame I:33    Avg QP:19.93  size: 11412
  
  [libx264 @ 0000000001d33f00] frame P:2281  Avg QP:23.72  size:  3112
  
  [libx264 @ 0000000001d33f00] frame B:5286  Avg QP:28.59  size:   446
  
  [libx264 @ 0000000001d33f00] consecutive B-frames:  4.3%  6.9%  5.9% 82.8%
  
  [libx264 @ 0000000001d33f00] mb I  I16..4: 12.9% 42.9% 44.2%
  
  [libx264 @ 0000000001d33f00] mb P  I16..4:  1.3%  4.4%  2.3%  P16..4: 41.4% 22.0% 15.5%  0.0%  0.0%    skip:13.1%
  
  [libx264 @ 0000000001d33f00] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 35.2%  5.9%  2.1%  direct: 3.0%  skip:53.6%  L0:35.3% L1:48.0% BI:16.8%
  
  [libx264 @ 0000000001d33f00] 8x8 transform intra:53.4% inter:57.9%
  
  [libx264 @ 0000000001d33f00] coded y,uvDC,uvAC intra: 70.6% 89.7% 67.6% inter: 18.1% 20.3% 7.2%
  
  [libx264 @ 0000000001d33f00] i16 v,h,dc,p: 24% 24%  6% 45%
  
  [libx264 @ 0000000001d33f00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 14% 19%  5%  5%  7%  5% 10%  7%
  
  [libx264 @ 0000000001d33f00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 15% 15%  6%  6%  7%  6%  8%  6%
  
  [libx264 @ 0000000001d33f00] i8c dc,h,v,p: 42% 17% 28% 14%
  
  [libx264 @ 0000000001d33f00] Weighted P-Frames: Y:26.3% UV:12.9%
  
  [libx264 @ 0000000001d33f00] ref P L0: 58.7% 24.7% 10.9%  4.8%  1.0%
  
  [libx264 @ 0000000001d33f00] ref B L0: 92.6%  5.8%  1.6%
  
  [libx264 @ 0000000001d33f00] ref B L1: 96.3%  3.7%
  
  [libx264 @ 0000000001d33f00] kb/s:258.68
  
  [aac @ 00000000005fc9e0] Qavg: 686.637
  
  [libx264 @ 0000000002017180] frame I:31    Avg QP:19.77  size: 29228
  
  [libx264 @ 0000000002017180] frame P:2040  Avg QP:23.08  size:  8765
  
  [libx264 @ 0000000002017180] frame B:5529  Avg QP:27.28  size:  1471
  
  [libx264 @ 0000000002017180] consecutive B-frames:  1.3%  4.2%  2.4% 92.1%
  
  [libx264 @ 0000000002017180] mb I  I16..4:  8.3% 58.8% 32.9%
  
  [libx264 @ 0000000002017180] mb P  I16..4:  3.2%  9.5%  2.6%  P16..4: 41.5% 19.5% 11.4%  0.0%  0.0%    skip:12.2%
  
  [libx264 @ 0000000002017180] mb B  I16..4:  0.2%  0.3%  0.1%  B16..8: 34.5%  5.8%  1.7%  direct: 2.7%  skip:54.7%  L0:35.9% L1:49.5% BI:14.6%
  
  [libx264 @ 0000000002017180] 8x8 transform intra:61.2% inter:67.3%
  
  [libx264 @ 0000000002017180] coded y,uvDC,uvAC intra: 55.8% 84.8% 51.3% inter: 15.6% 19.3% 3.9%
  
  [libx264 @ 0000000002017180] i16 v,h,dc,p: 24% 29%  8% 39%
  
  [libx264 @ 0000000002017180] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 17% 21%  5%  5%  7%  5%  8%  6%
  
  [libx264 @ 0000000002017180] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 18% 15%  6%  7%  7%  6%  7%  5%
  
  [libx264 @ 0000000002017180] i8c dc,h,v,p: 42% 18% 27% 13%
  
  [libx264 @ 0000000002017180] Weighted P-Frames: Y:22.3% UV:12.2%
  
  [libx264 @ 0000000002017180] ref P L0: 58.5% 23.4% 12.2%  5.2%  0.8%
  
  [libx264 @ 0000000002017180] ref B L0: 93.1%  5.3%  1.6%
  
  [libx264 @ 0000000002017180] ref B L1: 96.6%  3.4%
  
  [libx264 @ 0000000002017180] kb/s:708.47
  
  [aac @ 0000000001d35200] Qavg: 686.637
  
  [libx264 @ 0000000001d35ba0] frame I:31    Avg QP:19.63  size: 41522
  
  [libx264 @ 0000000001d35ba0] frame P:2025  Avg QP:22.86  size: 13415
  
  [libx264 @ 0000000001d35ba0] frame B:5544  Avg QP:26.52  size:  2471
  
  [libx264 @ 0000000001d35ba0] consecutive B-frames:  1.1%  3.9%  2.8% 92.2%
  
  [libx264 @ 0000000001d35ba0] mb I  I16..4: 10.6% 62.4% 26.9%
  
  [libx264 @ 0000000001d35ba0] mb P  I16..4:  4.7% 12.4%  2.6%  P16..4: 41.1% 17.8%  9.4%  0.0%  0.0%    skip:11.9%
  
  [libx264 @ 0000000001d35ba0] mb B  I16..4:  0.3%  0.5%  0.1%  B16..8: 34.0%  5.5%  1.4%  direct: 2.9%  skip:55.3%  L0:36.7% L1:50.2% BI:13.1%
  
  [libx264 @ 0000000001d35ba0] 8x8 transform intra:61.7% inter:71.6%
  
  [libx264 @ 0000000001d35ba0] coded y,uvDC,uvAC intra: 48.0% 81.9% 43.3% inter: 14.7% 19.7% 2.6%
  
  [libx264 @ 0000000001d35ba0] i16 v,h,dc,p: 27% 29%  9% 35%
  
  [libx264 @ 0000000001d35ba0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 19% 22%  5%  5%  6%  5%  7%  5%
  
  [libx264 @ 0000000001d35ba0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 25% 16%  5%  6%  7%  6%  6%  4%
  
  [libx264 @ 0000000001d35ba0] i8c dc,h,v,p: 42% 20% 26% 12%
  
  [libx264 @ 0000000001d35ba0] Weighted P-Frames: Y:18.1% UV:10.8%
  
  [libx264 @ 0000000001d35ba0] ref P L0: 59.5% 22.6% 12.6%  4.8%  0.5%
  
  [libx264 @ 0000000001d35ba0] ref B L0: 93.6%  5.0%  1.4%
  
  [libx264 @ 0000000001d35ba0] ref B L1: 97.1%  2.9%
  
  [libx264 @ 0000000001d35ba0] kb/s:1109.23
  
  [aac @ 0000000001d828a0] Qavg: 686.637
  
  [libx264 @ 0000000001d7f880] frame I:32    Avg QP:19.45  size: 64737
  
  [libx264 @ 0000000001d7f880] frame P:2104  Avg QP:22.44  size: 23985
  
  [libx264 @ 0000000001d7f880] frame B:5464  Avg QP:25.65  size:  4999
  
  [libx264 @ 0000000001d7f880] consecutive B-frames:  1.2%  7.7%  3.2% 87.8%
  
  [libx264 @ 0000000001d7f880] mb I  I16..4: 12.5% 70.0% 17.5%
  
  [libx264 @ 0000000001d7f880] mb P  I16..4:  6.7% 17.1%  1.8%  P16..4: 40.7% 14.9%  6.6%  0.0%  0.0%    skip:12.2%
  
  [libx264 @ 0000000001d7f880] mb B  I16..4:  0.6%  0.9%  0.1%  B16..8: 32.5%  4.7%  1.0%  direct: 2.9%  skip:57.4%  L0:37.6% L1:51.6% BI:10.8%
  
  [libx264 @ 0000000001d7f880] 8x8 transform intra:65.7% inter:77.5%
  
  [libx264 @ 0000000001d7f880] coded y,uvDC,uvAC intra: 39.5% 76.4% 32.4% inter: 13.2% 19.8% 1.5%
  
  [libx264 @ 0000000001d7f880] i16 v,h,dc,p: 32% 27% 10% 31%
  
  [libx264 @ 0000000001d7f880] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 18% 23%  4%  5%  5%  4%  5%  4%
  
  [libx264 @ 0000000001d7f880] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 20% 15%  5%  7%  7%  6%  6%  4%
  
  [libx264 @ 0000000001d7f880] i8c dc,h,v,p: 42% 19% 27% 12%
  
  [libx264 @ 0000000001d7f880] Weighted P-Frames: Y:10.5% UV:6.7%
  
  [libx264 @ 0000000001d7f880] ref P L0: 62.3% 20.4% 12.7%  4.3%  0.3%
  
  [libx264 @ 0000000001d7f880] ref B L0: 93.4%  5.2%  1.4%
  
  [libx264 @ 0000000001d7f880] ref B L1: 97.7%  2.3%
  
  [libx264 @ 0000000001d7f880] kb/s:2101.26
  
  [aac @ 0000000001d81560] Qavg: 686.637
  
  [libx264 @ 0000000001d7fd60] frame I:33    Avg QP:18.36  size: 98904
  
  [libx264 @ 0000000001d7fd60] frame P:3180  Avg QP:21.67  size: 33377
  
  [libx264 @ 0000000001d7fd60] frame B:4387  Avg QP:24.61  size:  7729
  
  [libx264 @ 0000000001d7fd60] consecutive B-frames:  2.7% 55.9% 15.6% 25.9%
  
  [libx264 @ 0000000001d7fd60] mb I  I16..4: 22.4% 66.9% 10.7%
  
  [libx264 @ 0000000001d7fd60] mb P  I16..4:  9.9% 17.8%  0.7%  P16..4: 40.4%  9.2%  3.0%  0.0%  0.0%    skip:19.0%
  
  [libx264 @ 0000000001d7fd60] mb B  I16..4:  0.8%  1.3%  0.1%  B16..8: 30.2%  2.6%  0.4%  direct: 1.7%  skip:63.0%  L0:38.1% L1:54.9% BI: 7.0%
  
  [libx264 @ 0000000001d7fd60] 8x8 transform intra:62.5% inter:82.9%
  
  [libx264 @ 0000000001d7fd60] coded y,uvDC,uvAC intra: 25.4% 59.5% 11.6% inter: 9.6% 16.3% 0.7%
  
  [libx264 @ 0000000001d7fd60] i16 v,h,dc,p: 33% 28% 15% 24%
  
  [libx264 @ 0000000001d7fd60] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 34% 20% 29%  3%  3%  4%  3%  3%  3%
  
  [libx264 @ 0000000001d7fd60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 25% 16%  4%  6%  6%  5%  5%  4%
  
  [libx264 @ 0000000001d7fd60] i8c dc,h,v,p: 39% 21% 28% 12%
  
  [libx264 @ 0000000001d7fd60] Weighted P-Frames: Y:5.7% UV:3.6%
  
  [libx264 @ 0000000001d7fd60] ref P L0: 70.0% 18.6%  8.3%  3.1%  0.1%
  
  [libx264 @ 0000000001d7fd60] ref B L0: 91.4%  7.6%  1.0%
  
  [libx264 @ 0000000001d7fd60] ref B L1: 99.0%  1.0%
  
  [libx264 @ 0000000001d7fd60] kb/s:3771.31
  
  [aac @ 0000000001d823e0] Qavg: 686.637

  But I don’t have any problem for streaming files with creating resolutions from a file which have lower orginal quality than hd1080
  What I can to do ?

• FFmpeg error : ratecontrol_init : can't open stats file

  18 décembre 2015, par oldo.nicho

  I’ve setup an AWS EC2 instance running Ubuntu 14.04 and have installed FFmpeg so that I can compress and transcode video.

  I’m trying to do a two pass conversion with the following code :

  ffmpeg -i input-file.avi -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=702:-1 -threads 0 -pass 1 -an -f mp4 ~/encoded/null

  and second pass :

  ffmpeg -i input-file.avi -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=702:-1 -threads 0 -pass 2 -codec:a libfdk_aac -b:a 128k -f mp4 output-file.mp4

  However I get the following error :

  ffmpeg version N-77283-g91c2a33 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'input-file.avi':
  
    Duration: 01:18:05.29, start: 0.000000, bitrate: 2025 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 1789 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 224 kb/s
  
  [libx264 @ 0x1e04240] using SAR=1/1
  
  [libx264 @ 0x1e04240] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x1e04240] ratecontrol_init: can't open stats file
  
  Output #0, mp4, to '/home/ubuntu/encoded/null':
  
      Stream #0:0: Video: h264, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 29.97 fps
  
      Metadata:
  
        encoder         : Lavc57.17.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  The command as written above works fine on my local computer (running OSX). Would anyone have any suggestions as to how to fix this problem ?