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  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • Déploiements possibles

    31 janvier 2010, par

    Deux types de déploiements sont envisageable dépendant de deux aspects : La méthode d’installation envisagée (en standalone ou en ferme) ; Le nombre d’encodages journaliers et la fréquentation envisagés ;
    L’encodage de vidéos est un processus lourd consommant énormément de ressources système (CPU et RAM), il est nécessaire de prendre tout cela en considération. Ce système n’est donc possible que sur un ou plusieurs serveurs dédiés.
    Version mono serveur
    La version mono serveur consiste à n’utiliser qu’une (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

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  • How to Write to AVI with OpenCV Python on Windows 10

    29 juillet 2019, par Novak

    I want to write properly formed frames of video data to an AVI.

    All attempts fail.

    What I end up with, after long efforts of debugging, are *.avi files of non-zero length in the desired directory, which will not play with any of multiple video players already installed on my system.

    Please note : High quality answers will be COMPLETE and DETAIL oriented. In particular, questions about writing video with OpenCV tend to generate drive-by responses including little more than another four-letter code to stick in fourcc. Answers which do so without also telling me at a minimum what file extension to use, what file type it will generate, and why it is expected to work over what I give above are unhelpful.

    Here are the salient details of the system :

    Operating System : Windows 10
    Language : Python 3.7, with Anaconda 3
    OpenCV : 4.1.0

    Here Is What I Have Done/Tried :

    Installed FFMPEG as per this link, restarted Anaconda, and verified ffmpeg (ffmpeg -version) from within Anaconda, with the following result :

    ffmpeg version N-94396-g47b6ca0b02 Copyright (c) 2000-2019 the FFmpeg developers
    
built with gcc 9.1.1 (GCC) 20190716
    
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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
    
libavutil      56. 32.100 / 56. 32.100
    
libavcodec     58. 55.100 / 58. 55.100
    
libavformat    58. 30.100 / 58. 30.100
    
libavdevice    58.  9.100 / 58.  9.100
    
libavfilter     7. 58.100 /  7. 58.100
    
libswscale      5.  6.100 /  5.  6.100
    
libswresample   3.  6.100 /  3.  6.100
    
libpostproc    55.  6.100 / 55.  6.100

    Multiple variations on the theme of :

    import cv2
    
fourcc = cv2.VideoWriter_fourcc(*"DIVX")
    
vidout = cv2.VideoWriter(baseDir + "videos\\foo.avi", fourcc, 30, (530, 476))
    

    
for frame in frames:
    
    <do stuff="stuff" to="to" generate="generate" foo="foo">
    
    cv2.imshow("foo", foo)
    
    vidout.write(foo)
    
vidout.release()
    
</do>

    Verified shape, dtype, and general viability of output data with cv2.imshow("foo", foo)

    Results : Unplayable AVI files

  • FFmpeg is dropping a frame when converting MP4 to image sequence

    24 juillet 2019, par Phillip Dodson

    I have an MP4 file that’s encoded at 12fps that I’m trying to convert to an image sequence using FFmpeg. The issue is that there is one frame missing. I’ve used the solutions here to confirm that the number of frames are 195 but when I run the following ffmpeg -i video.mp4 frames_%04d.png, I only get 194 PNGs. I’ve tried using the -r 12 and -framerate 12 flags but they do not change the output.

    I’ve also run the MP4 through Adobe Media Encoder to create an image sequence and that produces 195 frames. Any thoughts on to why I’m losing a frame ?

    Edit - Logs added below

    Log from the command ffmpeg -i video.mp4 frames_%04d.png :

    ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.4_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fead5800000] st: 0 edit list: 1 Missing key frame while searching for timestamp: 0
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fead5800000] st: 0 edit list 1 Cannot find an index entry before timestamp: 0.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2019-07-23T18:30:01.000000Z
    
  Duration: 00:00:16.25, start: 0.000000, bitrate: 957 kb/s
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 728x90, 953 kb/s, 12 fps, 12 tbr, 24k tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2019-07-23T18:30:01.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
    
Press [q] to stop, [?] for help
    
Output #0, image2, to 'frames_%04d.png':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    encoder         : Lavf58.20.100
    
    Stream #0:0(eng): Video: png, rgb24, 728x90, q=2-31, 200 kb/s, 12 fps, 12 tbn, 12 tbc (default)
    
    Metadata:
    
      creation_time   : 2019-07-23T18:30:01.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : Lavc58.35.100 png
    
frame=  194 fps=0.0 q=-0.0 Lsize=N/A time=00:00:16.16 bitrate=N/A speed=52.1x    
    
video:17552kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    Log from the command that I use that shows 195 frames ffmpeg -i video.mp4 -map 0:v:0 -c copy -f null -

    ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.4_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f88f700b000] st: 0 edit list: 1 Missing key frame while searching for timestamp: 0
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f88f700b000] st: 0 edit list 1 Cannot find an index entry before timestamp: 0.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2019-07-23T18:30:01.000000Z
    
  Duration: 00:00:16.25, start: 0.000000, bitrate: 957 kb/s
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 728x90, 953 kb/s, 12 fps, 12 tbr, 24k tbn, 24 tbc (default)
    
    Metadata:
    
      creation_time   : 2019-07-23T18:30:01.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
Output #0, null, to 'pipe:':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    encoder         : Lavf58.20.100
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 728x90, q=2-31, 953 kb/s, 12 fps, 12 tbr, 24k tbn, 24k tbc (default)
    
    Metadata:
    
      creation_time   : 2019-07-23T18:30:01.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
Press [q] to stop, [?] for help
    
frame=  195 fps=0.0 q=-1.0 Lsize=N/A time=00:00:16.08 bitrate=N/A speed=1.13e+04x    
    
video:1891kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  • FFmpeg Convert to JPEG works in VLC but not in Mac Preview ?

    24 juillet 2019, par Evan Keeton

    I’m trying to convert a PNG image to a JPEG image using ffmpeg. As far as I can tell, it’s working fine, but it doesn’t display properly in Mac Preview.

    I’m running the following :

    $ ffmpeg -i foo.png foo.jpg

    And it produces the following output :

    ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libavresample   4.  0.  0 /  4.  0.  0
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Input #0, png_pipe, from 'foo.png':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: png, rgba(pc), 200x231, 25 tbr, 25 tbn, 25 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x7ffeaf00ae00] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'foo.jpg':
    
  Metadata:
    
    encoder         : Lavf58.20.100
    
    Stream #0:0: Video: mjpeg, yuvj444p(pc), 200x231, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    
    Metadata:
    
      encoder         : Lavc58.35.100 mjpeg
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    
frame=    1 fps=0.0 q=3.7 Lsize=N/A time=00:00:00.04 bitrate=N/A speed= 4.7x    
    
video:12kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    When I open foo.jpg in most applications, such as VLC or Google Chrome, I get exactly what I expected : an image that looks exactly the same as foo.png, the input.

    <code width='200' height='231' / class='spip_code' dir='ltr'>foo.png</code> (input)
    <code width='200' height='231' / class='spip_code' dir='ltr'>foo.jpg</code> (output)

    However, this is what is displayed in the Finder preview, and the same this is displayed when I open up the file in "Preview."

    the problem

     I wonder if this has something to do with the deprecated pixel format used, make sure you did set range correctly error, but I’m not sure, especially since the image is fine, the problem seems to be elsewhere. 

    It seems the deprecated pixel format error is not the issue (that’s an internal thing), so I guess I just need to specify pixel formats properly.

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