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Autres articles (35)

  • La sauvegarde automatique de canaux SPIP

    1er avril 2010, par

    Dans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
    Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

Sur d’autres sites (4238)

  • mp3enc : write full LAME frame

    12 avril 2014, par Anton Khirnov
    mp3enc : write full LAME frame

    Most importantly, it contains the encoder delay and replaygain info.
    • [DBH] doc/muxers.texi
    • [DBH] libavformat/mp3enc.c

  • Use FFMPEG without downloading full file

    19 août 2020, par servalex

    I'm generating thumbnails for a videos that are available from s3 and need to minimize traffic.
Frame is going to be from the first couple seconds of the video so the question : is there a way to get frame without passing the full file through network ?

    


    At the moment I'm passing video url to ffmpeg but seems like it downloads the whole file, not only first couple seconds.

    


    ffmpeg -ss 0 -noaccurate_seek -i {srcPresignedUrl} -vframes 1 -q:v 2 {outputFileName}

    


    I tried downloading first 10mb of the file and passing it, this works for some mp4 files, but fails on mov :

    


    ffmpeg.exe -ss 0 -i source.mov -vframes 1 -q:v 2 thumb.jpg
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000017582ffff40] moov atom not found
source.mov: Invalid data found when processing input



    


  • swscale/ppc : VSX-optimize non-full-chroma yuv2rgb_2

    5 avril 2019, par Lauri Kasanen
    swscale/ppc : VSX-optimize non-full-chroma yuv2rgb_2

    ./ffmpeg -f lavfi -i yuvtestsrc=duration=1:size=1200x1440 -sws_flags fast_bilinear \
    
        -s 1200x720 -f null -vframes 100 -pix_fmt $i -nostats \
    
        -cpuflags 0 -v error -
    

    32-bit mul, power8 only.
    

     2x speedup :
    

    rgb24
    
  24431 UNITS in yuv2packed2,   16384 runs,      0 skips
    
  13783 UNITS in yuv2packed2,   16383 runs,      1 skips
    
bgr24
    
  24396 UNITS in yuv2packed2,   16384 runs,      0 skips
    
  14059 UNITS in yuv2packed2,   16384 runs,      0 skips
    
rgba
    
  26815 UNITS in yuv2packed2,   16383 runs,      1 skips
    
  12797 UNITS in yuv2packed2,   16383 runs,      1 skips
    
bgra
    
  27060 UNITS in yuv2packed2,   16384 runs,      0 skips
    
  13138 UNITS in yuv2packed2,   16384 runs,      0 skips
    
argb
    
  26998 UNITS in yuv2packed2,   16384 runs,      0 skips
    
  12728 UNITS in yuv2packed2,   16381 runs,      3 skips
    
bgra
    
  26651 UNITS in yuv2packed2,   16384 runs,      0 skips
    
  13124 UNITS in yuv2packed2,   16384 runs,      0 skips
    

    This is a low speedup, but the x86 mmx version also gets only 2x. The mmx version
    
is also heavily inaccurate, while the vsx version has high accuracy.
    • [DH] libswscale/ppc/swscale_vsx.c

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