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  • Qu’est ce qu’un masque de formulaire

    13 juin 2013, par

    Un masque de formulaire consiste en la personnalisation du formulaire de mise en ligne des médias, rubriques, actualités, éditoriaux et liens vers des sites.
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  • MediaSPIP v0.2

    21 juin 2013, par

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  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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  • Recording a webpage stream with multiple requests using PhantomJS & ffmpeg to /dev/stdout leads to ffmpeg error

    2 septembre 2016, par Allisson Ferreira

    First of all, sorry for my english.

    I’m in a quest for days. I’ve researched everywhere and I couldn’t find an answer to my problem.

    I’m using Nodejs, Phantomjs and ffmpeg in this scenary :

    • An user enters the site, login with facebook and he can ask for a video with his name and some random photos (gathered by /me/ & sent via JSON POST) ;
    • Node receive the user data, creates a child process (PhantomJS + ffmpeg) and awaits for a response to send the video URL to the user.

    When I run a single instance of this request, everything is working fine. BUT, when two or more users make the request, only one video is sent and the others process end up in a ffmpeg stream error.

    I think the reason is that all the ffmpeg processes are using the same place (/dev/stdout). Since one process is already using it, the others enters in a "can’t access" error. But it is a assumption, I don’t know how /dev/stdout really works.

    Here are my codes. (I have removed some lines and renamed some variables for better understanding, sorry for any mistake)

    index.js :

    var generateVideo = 'phantomjs phantom.js '+videoID+' '+userID+' | ffmpeg -vcodec png -f image2pipe -r 30 -i - -pix_fmt yuv420p public/videos/'+userID+'/'+videoID+'.mp4 -y';
    

    
childProcess.exec(generateVideo, function(err, stdout, stderr) {
    
    var json    = {};
    
    json.video  = '/videos/'+userID+'/'+videoID+'.mp4';
    
    res.send(json);
    
});

    phantom.js :

    var page            = require('webpage').create();
    
page.viewportSize   = { width: 1366, height: 768 };
    
page.settings.resourceTimeout = 10000;
    

    
var args            = require('system').args;
    
var videoID         = args[1];
    
var userID          = args[2];
    

    
page.open('http://localhost:3000/recordvideo/'+videoID, 'post', function(status){
    
    var frame       = 0;
    
    var target_fps  = 30;
    
    var maxframes   = page.evaluate(function () {
    
                        return getTotalDurationInSeconds();
    
                    }) * target_fps;
    

    
    setInterval(function(){
    
        page.render('/dev/stdout', { format: "png" });
    
        if( frame >= maxframes ){
    
            phantom.exit();
    
        }
    
        frame++;
    
    }, (1000 / target_fps));
    
});

    And the error :

    [Error: Command failed: /bin/sh -c phantomjs phantom.js XXXXXXXX XXXXXXXX | ffmpeg -vcodec png -f image2pipe -r 30 -i - -pix_fmt yuv420p public/videos/XXXXXXXX/XXXXXXXX.mp4 -y
    
www-0 ffmpeg version N-80901-gfebc862 Copyright (c) 2000-2016 the FFmpeg developers
    
www-0   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
    
www-0   configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
    
www-0   libavutil      55. 28.100 / 55. 28.100
    
www-0   libavcodec     57. 48.101 / 57. 48.101
    
www-0   libavformat    57. 41.100 / 57. 41.100
    
www-0   libavdevice    57.  0.102 / 57.  0.102
    
www-0   libavfilter     6. 47.100 /  6. 47.100
    
www-0   libavresample   3.  0.  0 /  3.  0.  0
    
www-0   libswscale      4.  1.100 /  4.  1.100
    
www-0   libswresample   2.  1.100 /  2.  1.100
    
www-0   libpostproc    54.  0.100 / 54.  0.100
    
www-0 [png @ 0x3d7c4a0] Invalid PNG signature 0x46726F6D20506861.
    
www-0 [image2pipe @ 0x3d72780] decoding for stream 0 failed
    
www-0 [image2pipe @ 0x3d72780] Could not find codec parameters for stream 0 (Video: png, none(pc)): unspecified size
    
www-0 Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
www-0 Input #0, image2pipe, from 'pipe:':
    
www-0   Duration: N/A, bitrate: N/A
    
www-0     Stream #0:0: Video: png, none(pc), 30 tbr, 30 tbn, 30 tbc
    
www-0 [buffer @ 0x3d81540] Unable to parse option value "0x0" as image size
    
www-0 [buffer @ 0x3d81540] Unable to parse option value "-1" as pixel format
    
www-0 [buffer @ 0x3d81540] Unable to parse option value "0x0" as image size
    
www-0 [buffer @ 0x3d81540] Error setting option video_size to value 0x0.
    
www-0 [graph 0 input from stream 0:0 @ 0x3d72600] Error applying options to the filter.
    
www-0 Error opening filters!
    
www-0 ]

    I really hope that I can find an answer here !
    And sorry if there already is an answer for this. But I researched for days.

    Thank you in advance !

  • Why ffmpeg rotates video ?

    15 septembre 2016, par hasanghaforian

    I use this code in a bash script to create GIF images from video files :

    ffmpeg -y -ss 3 -t 4 -i $vid \
    
 -vf fps=10,scale=320:-1:flags=lanczos,palettegen palette.png
    

    
ffmpeg -ss 3 -t 4 -i $vid -i palette.png -filter_complex \
    
 "fps=10,scale=320:-1:flags=lanczos[x];[x][1:v]paletteuse" ../gifs/"$i".gif

    But some GIF images are rotated ! While their thumbnails which is created by OS is not rotated. How I can solve this problem ?

    Update :

    Here you can see outputs of commands :

    Generating palette :

    ffmpeg version N-79139-gde1a0d4 Copyright (c) 2000-2016 the FFmpeg developers
    
  ...
    
Input #0, 
    
...
    
    Metadata:
    
      rotate          : 90
    
      creation_time   : ...
    
      handler_name    : VideoHandle
    
      encoder         :                                
    
    Side data:
    
      displaymatrix: rotation of -90.00 degrees
    
    ...

    Creating GIF using the palette :

    Input #0, 
    
...
    
    Metadata:
    
      rotate          : 90
    
      creation_time   : 2012-01-01 07:47:56
    
      handler_name    : VideoHandle
    
      encoder         :                                
    
    Side data:
    
      displaymatrix: rotation of -90.00 degrees
    
    ...

  • Convert swf to mp4

    28 septembre 2016, par Aleksey Kontsevich

    This answer had not helped : Convert compressed swf to mp4, trying to convert swf file.

    ffmpeg output :

    $ ffmpeg -i GTDS_demo_new.swf GTDS_demo_new.mp4
    
ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
    
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
  WARNING: library configuration mismatch
    
  avcodec     configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
[swf @ 0x21cd1e0] Could not find codec parameters for stream 1 (Video: none, none): unknown codec
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
Input #0, swf, from 'GTDS_demo_new.swf':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
    
    Stream #0:1: Video: none, none, 12 fps, 12 tbr, 12 tbn
    
File 'GTDS_demo_new.mp4' already exists. Overwrite ? [y/N] y
    
No decoder for stream #0:1, filtering impossible
    
Error opening filters!

    Splitting with dump-gnash also does not help : get sound without video after ffmpeg (this answer : http://stackoverflow.com/a/21023110/630169)

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