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Autres articles (53)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • MediaSPIP Player : problèmes potentiels

    22 février 2011, par

    Le lecteur ne fonctionne pas sur Internet Explorer
    Sur Internet Explorer (8 et 7 au moins), le plugin utilise le lecteur Flash flowplayer pour lire vidéos et son. Si le lecteur ne semble pas fonctionner, cela peut venir de la configuration du mod_deflate d’Apache.
    Si dans la configuration de ce module Apache vous avez une ligne qui ressemble à la suivante, essayez de la supprimer ou de la commenter pour voir si le lecteur fonctionne correctement : /** * GeSHi (C) 2004 - 2007 Nigel McNie, (...)

  • 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

Sur d’autres sites (5791)

  • A Better Process Runner

    1er janvier 2011, par Multimedia Mike — Python

    I was recently processing a huge corpus of data. It went like this : For each file in a large set, run 'cmdline-tool <file>', capture the output and log results to a database, including whether the tool crashed. I wrote it in Python. I have done this exact type of the thing enough times in Python that I’m starting to notice a pattern.

    Every time I start writing such a program, I always begin with using Python’s commands module because it’s the easiest thing to do. Then I always have to abandon the module when I remember the hard way that whatever ’cmdline-tool’ is, it might run errant and try to execute forever. That’s when I import (rather, copy over) my process runner from FATE, the one that is able to kill a process after it has been running too long. I have used this module enough times that I wonder if I should spin it off into a new Python module.

    Or maybe I’m going about this the wrong way. Perhaps when the data set reaches a certain size, I’m really supposed to throw it on some kind of distributed cluster rather than task it to a Python script (a multithreaded one, to be sure, but one that runs on a single machine). Running the job on a distributed architecture wouldn’t obviate the need for such early termination. But hopefully, such architectures already have that functionality built in. It’s something to research in the new year.

    I guess there are also process limits, enforced by the shell. I don’t think I have ever gotten those to work correctly, though.

  • Parallel transcoding with FFmpeg on M1 Mac

    27 août 2021, par Pushkar

    I'm trying to determine how effective an M1 Mac would be for transcoding video using FFmpeg (specifically resizing and adjusting bitrate). I can do single transcodes using a command like this :

    


    ffmpeg -I in.mp4 -nostdin -c:v h264_videotoolbox -c:a copy -vf scale=1280:720 -b:v 8000k out.mp4


    


    Now, when I run this, I can see the process in Activity Monitor, but it shows significant CPU use but 0% GPU use, although it's certainly using some form of hardware acceleration (using libx264 instead of h264_videotoolbox is much slower).

    


    When I try running multiple processes concurrently, the timings suggest little evidence of parallel execution :

    


    





    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    Test Timing
    convert single test file 6.8s
    convert file 5 times sequentially 33.6s
    convert file 5 times in parallel 31.5s

    


    


    Since the M1 chip is supposed to have 7 or 8 GPUs inside it, I expected to see quite good parallelism, so are there options which I'm missing which would :

    


      

    1. ensure that the transcoding is actually running on the GPU ?

      2. 


    2. allow parallel execution across the multiple GPUs ?

      3. 


    


  • How to combine 2 videos using either NReco ffmpeg ConvertMedia or just ffmpeg command line ?

    11 octobre 2016, par M. Ilchuk

    We have 2 videos : video1.webm and video2.webm.
    How to combine these two and get output.mp4 which contains video from video1.webm and audio from video1 and video2 ?

    Example :

    video1(audio1 in video1) + video2(audio2 in video2) = outputVideo(video1 + audio1 +audio2)

    image example

    ffmpeg -i 1.webm -i 2.webm
    ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg developers
    built with gcc 5.4.0 (GCC)
    configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-libebur128 —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-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-decklink —enable-zlib
    libavutil 55. 32.100 / 55. 32.100
    libavcodec 57. 60.101 / 57. 60.101
    libavformat 57. 51.102 / 57. 51.102
    libavdevice 57. 0.102 / 57. 0.102
    libavfilter 6. 63.100 / 6. 63.100
    libswscale 4. 1.100 / 4. 1.100
    libswresample 2. 2.100 / 2. 2.100
    libpostproc 54. 0.100 / 54. 0.100
    Input #0, matroska,webm, from ’1.webm’ :
    Metadata :
    encoder : libwebm-0.2.1.0
    creation_time : 2016-10-05T07:54:05.064000Z
    Duration : 00:00:30.11, start : 0.000000, bitrate : 798 kb/s
    Stream #0:0(eng) : Audio : opus, 48000 Hz, mono, fltp (default)
    Stream #0:1(eng) : Video : vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 8.33 tbr, 1k tbn, 1k tbc (default)
    Input #1, matroska,webm, from ’2.webm’ :
    Metadata :
    encoder : libwebm-0.2.1.0
    creation_time : 2016-10-05T07:54:20.135000Z
    Duration : 00:00:30.20, start : 0.000000, bitrate : 523 kb/s
    Stream #1:0(eng) : Audio : opus, 48000 Hz, mono, fltp (default)
    Stream #1:1(eng) : Video : vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
    At least one output file must be specified.

    No sound from video 2, video 1 but it is very bad.
    The process of converting long.

    >ffmpeg -i 1.webm -i 2.webm -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -ac 2 -shortest output.webm
    
ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 5.4.0 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --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-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      55. 32.100 / 55. 32.100
    
  libavcodec     57. 60.101 / 57. 60.101
    
  libavformat    57. 51.102 / 57. 51.102
    
  libavdevice    57.  0.102 / 57.  0.102
    
  libavfilter     6. 63.100 /  6. 63.100
    
  libswscale      4.  1.100 /  4.  1.100
    
  libswresample   2.  2.100 /  2.  2.100
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, matroska,webm, from '1.webm':
    
  Metadata:
    
    encoder         : libwebm-0.2.1.0
    
    creation_time   : 2016-10-05T07:54:05.064000Z
    
  Duration: 00:00:30.11, start: 0.000000, bitrate: 798 kb/s
    
    Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    
    Stream #0:1(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 8.33 tbr, 1k tbn, 1k tbc (default)
    
Input #1, matroska,webm, from '2.webm':
    
  Metadata:
    
    encoder         : libwebm-0.2.1.0
    
    creation_time   : 2016-10-05T07:54:20.135000Z
    
  Duration: 00:00:30.20, start: 0.000000, bitrate: 523 kb/s
    
    Stream #1:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    
    Stream #1:1(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 1k tbr, 1k tbn, 1k tbc (default)
    
[Parsed_amerge_0 @ 00000000026d4400] No channel layout for input 1
    
[Parsed_amerge_0 @ 00000000026d4400] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
    
[libvpx-vp9 @ 0000000002592280] v1.6.0
    
[libopus @ 00000000024d81e0] No bit rate set. Defaulting to 96000 bps.
    
Output #0, webm, to 'output.webm':
    
  Metadata:
    
    encoder         : Lavf57.51.102
    
    Stream #0:0(eng): Video: vp9 (libvpx-vp9), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 200 kb/s, 8.33 fps, 1k tbn, 8.33 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.60.101 libvpx-vp9
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
    Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, flt, 96 kb/s (default)
    
    Metadata:
    
      encoder         : Lavc57.60.101 libopus
    
Stream mapping:
    
  Stream #0:0 (opus) -> amerge:in0 (graph 0)
    
  Stream #1:0 (opus) -> amerge:in1 (graph 0)
    
  Stream #0:1 -> #0:0 (vp8 (native) -> vp9 (libvpx-vp9))
    
  amerge (graph 0) -> Stream #0:1 (libopus)
    
Press [q] to stop, [?] for help
    
Error while decoding stream #0:0: Cannot allocate memory94 bitrate=  91.8kbits/s speed=2.33x
    
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Error while decoding stream #0:0: Cannot allocate memory44 bitrate= 253.6kbits/s speed=0.64x
    
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Error while decoding stream #0:0: Cannot allocate memory40 bitrate= 254.2kbits/s speed=0.644x
    
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frame=  249 fps=5.4 q=0.0 Lsize=     946kB time=00:00:30.12 bitrate= 257.2kbits/s speed=0.654x
    
video:806kB audio:133kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.632650%

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