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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 (...)

  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

Sur d’autres sites (8851)

  • Dreamcast Track Sizes

    1er mars 2015, par Multimedia Mike — Sega Dreamcast

    I’ve been playing around with Sega Dreamcast discs lately. Not playing the games on the DC discs, of course, just studying their structure. To review, the Sega Dreamcast game console used special optical discs named GD-ROMs, where the GD stands for “gigadisc”. They are capable of holding about 1 gigabyte of data.

    You know what’s weird about these discs ? Each one manages to actually store a gigabyte of data. Each disc has a CD portion and a GD portion. The CD portion occupies the first 45000 sectors and can be read in any standard CD drive. This area is divided between a brief data track and a brief (usually) audio track.

    The GD region starts at sector 45000. Sometimes, it’s just one humongous data track that consumes the entire GD region. More often, however, the data track is split between the first track and the last track in the region and there are 1 or more audio tracks in between. But the weird thing is, the GD region is always full. I made a study of it (click for a larger, interactive graph) :


    Dreamcast Track Sizes

    Some discs put special data or audio bonuses in the CD region for players to discover. But every disc manages to fill out the GD region. I checked up on a lot of those audio tracks that divide the GD data and they’re legitimate music tracks. So what’s the motivation ? Why would the data track be split in 2 pieces like that ?

    I eventually realized that I probably answered this question in this blog post from 4 years ago. The read speed from the outside of an optical disc is higher than the inside of the same disc. When I inspect the outer data tracks of some of these discs, sure enough, there seem to be timing-sensitive multimedia FMV files living on the outer stretches.

    One day, I’ll write a utility to take apart the split ISO-9660 filesystem offset from a weird sector.

  • ffmpeg - extract timecode start metadata from tmcd track to a drawtext filter

    3 mars 2015, par mwjb

    I have a Quicktime file with a timecode track. I’m encoding it to a new video codec and would like to burnin the timecode from timecode track. Setting the timecode manually isn’t an option as this will be used for many files with unique starting timecodes.

    This is the current work-in-progress ffmpeg command. Obviously I need to find a way to extract the metadate:timecode value and have this start the timecode count instead of the manual entry seen below :

    ffmpeg -i infile.mov -y -c:v mjpeg -qscale:v 4 -vendor ap10 -pix_fmt yuvj422p -s 1280x720 -vf drawtext="fontfile=thefont.ttf: timecode='01\:00\:00\:00': rate=24: fontsize=40: fontcolor=white: boxcolor=black: box=1: x=1700: y=80" outfile.mov

    The Timecode metadata is there in the Stream #0:1 track, as read by ffmpeg :

    ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Jan  1 2015 20:24:48 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
    
configuration: --prefix=/Volumes/tempdisk/sw --as=yasm --enable-gpl --enable-pthreads --disable-ffplay --disable-ffserver --disable-shared --enable-static --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-avfilter --enable-fontconfig --enable-libfreetype --enable-libass --enable-libutvideo --enable-filters --enable-postproc --enable-runtime-cpudetect
    
libavutil      54. 15.100 / 54. 15.100
    
libavcodec     56. 13.100 / 56. 13.100
    
libavformat    56. 15.102 / 56. 15.102
    
libavdevice    56.  3.100 / 56.  3.100
    
libavfilter     5.  2.103 /  5.  2.103
    
libswscale      3.  1.101 /  3.  1.101
    
libswresample   1.  1.100 /  1.  1.100
    
libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'infile.mov':
    
  Metadata:
    
major_brand     : qt  
    
minor_version   : 537199360
    
compatible_brands: qt  
    
creation_time   : 2015-03-02 22:06:00
    
timecode        : 06:00:00:00
    
Duration: 00:20:00.00, start: 0.000000, bitrate: 36175 kb/s
    
Stream #0:0(eng): Video: dnxhd (AVdn / 0x6E645641), yuv422p, 1920x1080, 36175 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
    
Metadata:
    
  creation_time   : 2015-03-02 22:06:00
    
  handler_name    : Apple Alias Data Handler
    
  encoder         : Avid DNxHD Codec
    
Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
    
Metadata:
    
  creation_time   : 2015-03-02 22:06:58
    
  handler_name    : Apple Alias Data Handler
    
  timecode        : 06:00:00:00

    I came across this post ffmpeg and timecode from movie metadata which appeared to be on the same sort of track as I’m on. Would certainly appreciate some guidance on this. Many Thanks.

  • ffmpeg mapping to mkv introduces "fake" delay relative to video

    1er août 2016, par JMor

    I need to map this x.264 clip into a matroska container using ffmpeg :

    ffmpeg -i f-0.mp4 -c copy f-0.mkv

    Here is the ffmpeg console output :

    ffmpeg -i f-0.mp4 -c copy f-0.mkv   
    
ffmpeg version N-69672-g078be09 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      54. 18.100 / 54. 18.100
    
  libavcodec     56. 21.102 / 56. 21.102
    
  libavformat    56. 19.100 / 56. 19.100
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5.  9.104 /  5.  9.104
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'f-0.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.19.100
    
  Duration: 00:02:08.06, start: 0.005333, bitrate: 5030 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4865 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 160 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Side data:
    
      unknown side data type 7 (4 bytes)
    
Output #0, matroska, to 'f-0.mkv':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.19.100
    
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 4865 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 30k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 160 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Side data:
    
      unknown side data type 7 (4 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
...

    The result seems good, playing with well synchronized audio and video. However, MediaInfo shows a new item under Audio (that the original clip didn’t have) :

    Delay relative to video                  : 1mn 5s

    Here is the Mediainfo from the original f-0.mp4 file :

    Audio
    
  ID                                       : 2
    
  Format                                   : AC-3
    
  Format/Info                              : Audio Coding 3
    
  Mode extension                           : CM (complete main)
    
  Format settings, Endianness              : Big
    
  Codec ID                                 : ac-3
    
  Duration                                 : 2mn 8s
    
  Bit rate mode                            : Constant
    
  Bit rate                                 : 160 Kbps
    
  Channel(s)                               : 2 channels
    
  Channel positions                        : Front: L R
    
  Sampling rate                            : 48.0 KHz
    
  Bit depth                                : 16 bits
    
  Compression mode                         : Lossy
    
  Delay relative to video                  : 67ms
    
  Stream size                              : 2.44 MiB (3%)

    Mediainfo from the f-0.mkv output :

    Audio
    
  ID                                       : 2
    
  Format                                   : AC-3
    
  Format/Info                              : Audio Coding 3
    
  Mode extension                           : CM (complete main)
    
  Format settings, Endianness              : Big
    
  Codec ID                                 : A_AC3
    
  Duration                                 : 2mn 8s
    
  Bit rate mode                            : Constant
    
  Bit rate                                 : 160 Kbps
    
  Channel(s)                               : 2 channels
    
  Channel positions                        : Front: L R
    
  Sampling rate                            : 48.0 KHz
    
  Bit depth                                : 16 bits
    
  Compression mode                         : Lossy
    
  Delay relative to video                  : 1mn 5s
    
  Stream size                              : 2.44 MiB (3%)
    
  Default                                  : Yes
    
  Forced                                   : No
    
  HANDLER_NAME                             : SoundHandler

    There is no delay whatsoever and no reason to insert a delay.

    I am concerned that this information (Delay relative to video) be used by some players or other applications as a delay that should be corrected. Is there a way to prevent this from happening ?

    Adding ffprobe output : f-0.mp4 clip

    ffprobe -show_entries stream=codec_type,duration,start_time -of compact f-0.mp4
    
    ffprobe version N-69672-g078be09 Copyright (c) 2007-2015 the FFmpeg developers
    
    built with gcc 4.9.2 (GCC)
    
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
    libavutil      54. 18.100 / 54. 18.100
    
    libavcodec     56. 21.102 / 56. 21.102
    
    libavformat    56. 19.100 / 56. 19.100
    
    libavdevice    56.  4.100 / 56.  4.100
    
    libavfilter     5.  9.104 /  5.  9.104
    
    libswscale      3.  1.101 /  3.  1.101
    
    libswresample   1.  1.100 /  1.  1.100
    
    libpostproc    53.  3.100 / 53.  3.100
    
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'f-0.mp4':
    
    Metadata:
    
      major_brand     : isom
    
      minor_version   : 512
    
      compatible_brands: isomiso2avc1mp41
    
      encoder         : Lavf56.19.100
    
    Duration: 00:02:08.06, start: 0.005333, bitrate: 5030 kb/s
    
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4865 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    
      Metadata:
    
        handler_name    : VideoHandler
    
      Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 160 kb/s (default)
    
      Metadata:
    
        handler_name    : SoundHandler
    
      Side data:
    
        unknown side data type 7 (4 bytes)
    
  stream|codec_type=video|start_time=0.000000|duration=128.061267
    
  stream|codec_type=audio|start_time=-0.005333|duration=128.064000

    f-0.mkv clip :

    ffprobe version N-69672-g078be09 Copyright (c) 2007-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      54. 18.100 / 54. 18.100
    
  libavcodec     56. 21.102 / 56. 21.102
    
  libavformat    56. 19.100 / 56. 19.100
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5.  9.104 /  5.  9.104
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, matroska,webm, from 'f-0.mkv':
    
  Metadata:
    
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    
    MAJOR_BRAND     : isom
    
    MINOR_VERSION   : 512
    
    ENCODER         : Lavf56.19.100
    
  Duration: 00:02:08.13, start: 0.061000, bitrate: 5026 kb/s
    
    Stream #0:0(und): Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    
    Metadata:
    
      LANGUAGE        : und
    
      HANDLER_NAME    : VideoHandler
    
    Stream #0:1(und): Audio: ac3, 48000 Hz, stereo, fltp, 160 kb/s (default)
    
    Metadata:
    
      LANGUAGE        : und
    
      HANDLER_NAME    : SoundHandler
    
stream|codec_type=video|start_time=0.066000|duration=N/A
    
stream|codec_type=audio|start_time=0.061000|duration=N/A

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