Recherche avancée

Médias (1)

Mot : - Tags -/école

Autres articles (61)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Création définitive du canal

    12 mars 2010, par

    Lorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
    A la validation, vous recevez un email vous invitant donc à créer votre canal.
    Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
    A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...)

Sur d’autres sites (12441)

  • Convert form 30 to 60fps by increasing speed, not duplicating frames. FFmpeg

    14 janvier 2014, par Matt Pellegrini

    I have a video that is incorrectly labelled at 30fps, it is actually 60fps and so looks like it's being played at half speed. The audio is fine, that is, the soundtrack finishes half way through the video clip. I'd like to know how, if possible to fix this, that is double the video speed, making it 60fps and meaning that the audio and video are synced.

    The file is H.264 and the audio MPEG-4 AAC

    Thanks in advance for any help,

    Matt

    File details as given by ffmpeg, as requested :

    ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
    
built on Nov  9 2013 19:09:46 with gcc 4.8.1
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Tignes60fps.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    creation_time   : 2014-01-13 02:23:09
    
    Duration: 00:08:33.21, start: 0.000000, bitrate: 5690 kb/s
    
    Stream #0.0(eng): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 5609 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
Metadata:
    
    creation_time   : 2014-01-13 02:23:09
    
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 156 kb/s
    
Metadata:
    
      creation_time   : 2014-01-13 02:23:09
    
At least one output file must be specified

  • ffmpeg 'or' filter - what's the significance of red and blue ?

    9 juillet 2020, par BETLOG

    I'm tinkering with various ffmpeg filters to help me visualise the magnitude of difference certain presets use, and I notice a couple of filters display a lot of certain primary colours.
Specifically in this case : red and blue in an 'or' filter, and green in an 'and' filter.

    


    It seems useful to be able to tell WHICH input is being indicated, or to understand how the filters act in terms of sequence, and I'm hoping these colourations will help with this.
Or at least I'd like to better understand whatever they do represent.

    


    In the screenshot of the video segment above I see pure red and blue occasionally featuring strongly, and as the two extremes in the RgB palette it logically seems (and I'm hoping) they might indicate particular video inputs.
Similarly, the 'and' filter shows a lot of green shades, so I'm hoping someone can explain the meaning of the R,G, and B highlights in the 'or' and the 'and' filters.

    


    The relevant input and preset info in the images below is at the extreme left and right of each drawtext line.

    


    'or' filter - red vs blue

    


    'and' filter - greens

    


  • Convert form 30 to 60fps by increasing speed, not duplicating frames, using FFmpeg

    12 août 2018, par Matt Pellegrini

    I have a video that is incorrectly labelled at 30fps, it is actually 60fps and so looks like it’s being played at half speed. The audio is fine, that is, the soundtrack finishes half way through the video clip. I’d like to know how, if possible to fix this, that is double the video speed, making it 60fps and meaning that the audio and video are synced.

    The file is H.264 and the audio MPEG-4 AAC.

    File details as given by ffmpeg, as requested :

    ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
    
built on Nov  9 2013 19:09:46 with gcc 4.8.1
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Tignes60fps.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: isommp42
    
    creation_time   : 2014-01-13 02:23:09
    
    Duration: 00:08:33.21, start: 0.000000, bitrate: 5690 kb/s
    
    Stream #0.0(eng): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 5609 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
    
Metadata:
    
    creation_time   : 2014-01-13 02:23:09
    
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 156 kb/s
    
Metadata:
    
      creation_time   : 2014-01-13 02:23:09
    
At least one output file must be specified

Navigation