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  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Les images

    15 mai 2013

  • Mediabox : ouvrir les images dans l’espace maximal pour l’utilisateur

    8 février 2011, par

    La visualisation des images est restreinte par la largeur accordée par le design du site (dépendant du thème utilisé). Elles sont donc visibles sous un format réduit. Afin de profiter de l’ensemble de la place disponible sur l’écran de l’utilisateur, il est possible d’ajouter une fonctionnalité d’affichage de l’image dans une boite multimedia apparaissant au dessus du reste du contenu.
    Pour ce faire il est nécessaire d’installer le plugin "Mediabox".
    Configuration de la boite multimédia
    Dès (...)

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  • FFmpeg : "filter_complex" results in worse quality than "vf"

    16 novembre 2016, par Dasmowenator

    I’m trying to use FFmpeg to do some complex video transcoding (such as concatenating multiple files). To do this, I’ve been trying to use the filter_complex, but I’ve noticed a slight drop in quality from what I saw earlier using the normal video filter.

    To double-check, I boiled down my command to a simple transcode — one using filter_complex and one just using the vf — and I’ve confirmed that the output of the complex filter is noticeably blurry compared to the output of the normal video filter. I can’t find any FFmpeg documentation explaining this... does anyone know why this is happening and how I can get filter_complex to output the same quality video as vf ?

    Command using the normal video filter (vf) :

    ffmpeg -i input.ts -map_chapters -1 -f mpegts -an -sn -map 0:0 -vf "[in]yadif=deint=interlaced[out]" -vcodec libx264 -profile:v baseline -level 2 -b:v 800k output.ts

    FFmpeg Output :

    ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.1.2 (GCC) 20070626 (Red Hat 4.1.2-14)
    
  configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk-aac --enable-libfaac --enable-libvpx --enable-encoder=vorbis --enable-libvorbis --enable-libmp3lame --enable-libspeex --disable-decoder=prores --disable-decoder=prores_lgpl --disable-ffplay --disable-ffserver --disable-shared --enable-static --extra-cflags=-I/local/build/include --extra-libs=-lfdk-aac --extra-ldflags=-L/local/build/lib --prefix=/local/build/install
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip01.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
  Duration: 00:00:10.02, start: 0.023220, bitrate: 741 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 604 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[libx264 @ 0x138a99e0] No 608/708 caption insertion into sei user data.
    
[libx264 @ 0x138a99e0] using SAR=1/1
    
[libx264 @ 0x138a99e0] frame MB size (54x30) > level limit (396)
    
[libx264 @ 0x138a99e0] MB rate (48600) > level limit (11880)
    
[libx264 @ 0x138a99e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
    
[libx264 @ 0x138a99e0] profile Constrained Baseline, level 2.0
    
Output #0, mpegts, to 'output.ts':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.25.100
    
    Stream #0:0(und): Video: h264 (libx264), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, 800 kb/s, 30 fps, 90k tbn, 30 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc57.24.102 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
frame=  300 fps=179 q=-1.0 Lsize=    1059kB time=00:00:10.03 bitrate= 864.9kbits/s speed=   6x    
    
video:949kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.660099%
    
[libx264 @ 0x138a99e0] frame I:2     Avg QP:23.16  size: 26978
    
[libx264 @ 0x138a99e0] frame P:298   Avg QP:23.09  size:  3079
    
[libx264 @ 0x138a99e0] mb I  I16..4: 44.3%  0.0% 55.7%
    
[libx264 @ 0x138a99e0] mb P  I16..4:  1.1%  0.0%  0.5%  P16..4: 28.7%  8.4%  2.1%  0.0%  0.0%    skip:59.3%
    
[libx264 @ 0x138a99e0] final ratefactor: 22.63
    
[libx264 @ 0x138a99e0] coded y,uvDC,uvAC intra: 30.8% 62.8% 23.0% inter: 7.2% 14.8% 0.3%
    
[libx264 @ 0x138a99e0] i16 v,h,dc,p: 25% 39% 11% 24%
    
[libx264 @ 0x138a99e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 29% 16%  5%  6%  7%  6%  4%  5%
    
[libx264 @ 0x138a99e0] i8c dc,h,v,p: 45% 29% 18%  8%
    
[libx264 @ 0x138a99e0] kb/s:777.19

    Command using the complex filter :

    ffmpeg -i input.ts -map_chapters -1 -f mpegts -filter_complex "[0:v:0]yadif=deint=interlaced[v0];[v0]concat=n=1:v=1:a=0[cat_v]" -an -sn -map "[cat_v]" -vcodec libx264 -profile:v baseline -level 2 -b:v 800k output.ts

    FFmpeg Output :

    ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.1.2 (GCC) 20070626 (Red Hat 4.1.2-14)
    
  configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-libfdk-aac --enable-libfaac --enable-libvpx --enable-encoder=vorbis --enable-libvorbis --enable-libmp3lame --enable-libspeex --disable-decoder=prores --disable-decoder=prores_lgpl --disable-ffplay --disable-ffserver --disable-shared --enable-static --extra-cflags=-I/local/build/include --extra-libs=-lfdk-aac --extra-ldflags=-L/local/build/lib --prefix=/local/build/install
    
  libavutil      55. 17.103 / 55. 17.103
    
  libavcodec     57. 24.102 / 57. 24.102
    
  libavformat    57. 25.100 / 57. 25.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 31.100 /  6. 31.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip01.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.41.100
    
  Duration: 00:00:10.02, start: 0.023220, bitrate: 741 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 604 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[libx264 @ 0x81f5200] No 608/708 caption insertion into sei user data.
    
[libx264 @ 0x81f5200] using SAR=1/1
    
[libx264 @ 0x81f5200] frame MB size (54x30) > level limit (396)
    
[libx264 @ 0x81f5200] MB rate (48600) > level limit (11880)
    
[libx264 @ 0x81f5200] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
    
[libx264 @ 0x81f5200] profile Constrained Baseline, level 2.0
    
Output #0, mpegts, to 'output.ts':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.25.100
    
    Stream #0:0: Video: h264 (libx264), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, 800 kb/s, 30 fps, 90k tbn, 30 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.24.102 libx264
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 (h264) -> yadif
    
  concat -> Stream #0:0 (libx264)
    
Press [q] to stop, [?] for help
    
frame=  300 fps=179 q=-1.0 Lsize=    1059kB time=00:00:10.03 bitrate= 864.9kbits/s speed=   6x    
    
video:949kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.660099%
    
[libx264 @ 0x81f5200] frame I:2     Avg QP:23.16  size: 26978
    
[libx264 @ 0x81f5200] frame P:298   Avg QP:23.09  size:  3079
    
[libx264 @ 0x81f5200] mb I  I16..4: 44.3%  0.0% 55.7%
    
[libx264 @ 0x81f5200] mb P  I16..4:  1.1%  0.0%  0.5%  P16..4: 28.7%  8.4%  2.1%  0.0%  0.0%    skip:59.3%
    
[libx264 @ 0x81f5200] final ratefactor: 22.63
    
[libx264 @ 0x81f5200] coded y,uvDC,uvAC intra: 30.8% 62.8% 23.0% inter: 7.2% 14.8% 0.3%
    
[libx264 @ 0x81f5200] i16 v,h,dc,p: 25% 39% 11% 24%
    
[libx264 @ 0x81f5200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 29% 16%  5%  6%  7%  6%  4%  5%
    
[libx264 @ 0x81f5200] i8c dc,h,v,p: 45% 29% 18%  8%
    
[libx264 @ 0x81f5200] kb/s:777.19

  • Rename "AVClass class" as "AVClass component_class".

    30 juin 2013, par Carl Eugen Hoyos
    Rename "AVClass class" as "AVClass component_class".

    The aix header math.h defines "extern int class()" for C.
    • [DH] libavcodec/cljr.c
    • [DH] libavcodec/dnxhdenc.c
    • [DH] libavcodec/dvdsubdec.c
    • [DH] libavcodec/ffv1enc.c
    • [DH] libavcodec/g726.c
    • [DH] libavcodec/jpeg2000dec.c
    • [DH] libavcodec/rawdec.c
    • [DH] libavformat/flvdec.c
    • [DH] libavformat/gsmdec.c
    • [DH] libavformat/mov.c
    • [DH] libavformat/spdifenc.c
    • [DH] libavutil/eval.c

  • avcodec/vp3 : Fix "runtime error : left shift of negative value"

    4 décembre 2015, par Michael Niedermayer
    avcodec/vp3 : Fix "runtime error : left shift of negative value"

    Fixes : 5c6129154b356b80bcab86f9e3ee5d29/signal_sigabrt_7ffff6ae7cc9_7322_d26ac6d7cb6567db1b8be0159b387d0b.ogg
    

    Found-by : Mateusz "j00ru" Jurczyk and Gynvael Coldwind
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/vp3.c

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