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• ffmpeg converted x264 video shows sharply reduced color saturation

  3 novembre 2015, par xaphod

  I’m an ffmpeg noob. I did spend 30 mins googling stackoverflow though, and didn’t find an answer.

  My designer made me some videos, of animated drawings. They’re great, but huge. So I tried passing them through ffmpeg. They get 10x smaller and don’t look pixelated — great ! — but the color is greatly reduced. What’s bright red/pink in the original becomes washed out ashey-grey-red in the output, when I view it on my macbook, or in the app it’s going into (iOS — ie. on an iPhone 5S you can see the missing color). How can I get the color to stay the same(ish) ?

  ffmpeg -i original.mp4

  shows me this :

  ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 7.0.0 (clang-700.0.72)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 Introanimation@25fps_2.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2015-10-28 22:08:44
  
    Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding

  ... so far I tried ...

  ffmpeg -i original.mp4 -vf format=yuvj420p -color_range 2 -vcodec libx264 out.mp4

  ... and many others, but no luck.

  Original.mp4 is here : http://fuzzymunchkin.com/tmp/original.mp4

  EDIT : posting the output of a (no-parameters) conversion, as requested.

  ffmpeg -i original.mp4 out.mp4
  
  ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 7.0.0 (clang-700.0.72)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --enable-videotoolbox --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2015-10-28 22:08:44
  
    Duration: 00:00:16.00, start: 0.000000, bitrate: 1613 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x720, 1434 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
  [libx264 @ 0x7f8a5b80ea00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x7f8a5b80ea00] profile High, level 3.1
  
  [libx264 @ 0x7f8a5b80ea00] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x720, q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-10-28 22:08:44
  
        handler_name    : Alias Data Handler
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=  400 fps=0.0 q=-1.0 Lsize=     262kB time=00:00:15.92 bitrate= 134.9kbits/s    
  
  video:257kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.971545%
  
  [libx264 @ 0x7f8a5b80ea00] frame I:2     Avg QP:13.86  size:  9730
  
  [libx264 @ 0x7f8a5b80ea00] frame P:174   Avg QP:21.01  size:  1121
  
  [libx264 @ 0x7f8a5b80ea00] frame B:224   Avg QP:20.88  size:   215
  
  [libx264 @ 0x7f8a5b80ea00] consecutive B-frames: 19.2% 17.0%  3.8% 60.0%
  
  [libx264 @ 0x7f8a5b80ea00] mb I  I16..4: 62.9% 26.0% 11.1%
  
  [libx264 @ 0x7f8a5b80ea00] mb P  I16..4:  3.7%  1.0%  0.7%  P16..4:  3.0%  1.5%  0.8%  0.0%  0.0%    skip:89.3%
  
  [libx264 @ 0x7f8a5b80ea00] mb B  I16..4:  0.4%  0.1%  0.0%  B16..8:  3.3%  0.5%  0.0%  direct: 0.0%  skip:95.6%  L0:47.0% L1:43.5% BI: 9.5%
  
  [libx264 @ 0x7f8a5b80ea00] 8x8 transform intra:19.3% inter:33.8%
  
  [libx264 @ 0x7f8a5b80ea00] coded y,uvDC,uvAC intra: 7.4% 6.8% 5.5% inter: 0.5% 0.6% 0.5%
  
  [libx264 @ 0x7f8a5b80ea00] i16 v,h,dc,p: 70% 29%  1%  0%
  
  [libx264 @ 0x7f8a5b80ea00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15%  7% 77%  1%  0%  0%  0%  0%  0%
  
  [libx264 @ 0x7f8a5b80ea00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 23% 29%  3%  2%  2%  2%  1%  1%
  
  [libx264 @ 0x7f8a5b80ea00] i8c dc,h,v,p: 74% 10% 15%  0%
  
  [libx264 @ 0x7f8a5b80ea00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f8a5b80ea00] ref P L0: 64.1%  5.3% 17.6% 12.9%
  
  [libx264 @ 0x7f8a5b80ea00] ref B L0: 77.4% 19.7%  2.9%
  
  [libx264 @ 0x7f8a5b80ea00] ref B L1: 95.5%  4.5%
  
  [libx264 @ 0x7f8a5b80ea00] kb/s:131.31

• gdb not stopping at even trivial breakpoints

  18 novembre 2015, par baruch

  I am trying to debug ffplay (a debug build) compiled using mingw-w64 on msys2 on Windows 7 64bit. I tried setting breakpoints using gdb, and they seem to be set fine, but the program does not stop. So i tried issuing start, and again it didn’t stop. I tried manually setting a breakpoint at main, but it still didn’t stop. I verified that main is found, and it is. Here is a portion of the session. Any explanation what might cause this ?

  (gdb) start
  
  Temporary breakpoint 1 at 0x140013f7c: file C:/Users/bubaruch/Documents/projects/ffmpeg/ffmpeg/ffplay.c, line 3756.
  
  Starting program: C:\Users\bubaruch\Documents\projects\ffmpeg\b2\ffplay_g.exe
  
  [New Thread 7752.0x275c]
  
  ffplay version 2.8.git Copyright (c) 2003-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration: --disable-doc --disable-optimizations
  
    libavutil      55.  5.100 / 55.  5.100
  
    libavcodec     57. 15.100 / 57. 15.100
  
    libavformat    57. 14.100 / 57. 14.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 15.100 /  6. 15.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  Simple media player
  
  usage: ffplay [options] input_file
  
  
  
  An input file must be specified
  
  Use -h to get full help or, even better, run 'man ffplay'
  
  [Inferior 1 (process 7752) exited with code 01]
  
  
  
  (gdb) l main
  
  3748       return 1;
  
  3749    }
  
  3750
  
  3751    /* Called from the main */
  
  3752    int main(int argc, char **argv)
  
  3753    {
  
  3754        int flags;
  
  3755        VideoState *is;
  
  3756        char dummy_videodriver[] = "SDL_VIDEODRIVER=dummy";
  
  3757
  
  
  
  (gdb) b main
  
  Breakpoint 2 at 0x140013f7c: file C:/Users/bubaruch/Documents/projects/ffmpeg/ffmpeg/ffplay.c, line 3756.
  
  
  
  (gdb) r
  
  Starting program: C:\Users\bubaruch\Documents\projects\ffmpeg\b2\ffplay_g.exe
  
  [New Thread 15388.0x3278]
  
  ffplay version 2.8.git Copyright (c) 2003-2015 the FFmpeg developers
  
    built with gcc 5.2.0 (Rev4, Built by MSYS2 project)
  
    configuration: --disable-doc --disable-optimizations
  
    libavutil      55.  5.100 / 55.  5.100
  
    libavcodec     57. 15.100 / 57. 15.100
  
    libavformat    57. 14.100 / 57. 14.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 15.100 /  6. 15.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
  Simple media player
  
  usage: ffplay [options] input_file
  
  
  
  An input file must be specified
  
  Use -h to get full help or, even better, run 'man ffplay'
  
  [Inferior 1 (process 15388) exited with code 01]

• Evolution #3587 (Nouveau) : Intégrer le plugin upload HTML5 dans SPIP

  9 novembre 2015, par realet RealET

  J’utilise avec bonheur depuis mai 2015 ce plugin : http://contrib.spip.net/Formulaire-d-upload-en-html5

  Il permet :

  • de glisser/lâcher des fichiers pour les téléverser sur le serveur
  • il permet de le faire pour plusieurs fichiers à la fois !
  • un clic lance la boite de dialogue de sélection de fichiers classique (mais avec la possibilité de choisir plusieurs fichiers)
  • le téléversement est animé avec une barre de progression (et si c’est une image, une version miniature)

  Bref, c’est une série d’amélioration visuelles et fonctionnelles qui sont :

  • utilises
  • ergonomiques
  • conviviales
  • immédiatement visible
  • et intéressant à annoncer comme évolution de SPIP

  De plus, sous le capot, ça utilise les mécanismes natifs de SPIP pour l’upload, donc, la sécurité native de SPIP.