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Autres articles (38)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

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  • How to do filter twice at different time ffmpeg

    29 décembre 2022, par Мохамед Русланович

    Am trying to implement overlay twice but at different position and different time
Here is what am trying to do :
i just duplicate the filter

    


    ffmpeg -t 50 -y -i film.mp4 -stream_loop -1 -i gif.gif -filter_complex "


[1]colorchannelmixer=aa=1,scale=iw*2:-1[a];[0][a]overlay=x='200':y='300':shortest=1:enable='between(t,0,10)';

[1]colorchannelmixer=aa=1,scale=iw*2:-1[b];[0][b]overlay=x='200':y='300':shortest=1:enable='between(t,15,20)'"  

-acodec copy output_task_3.mp4


    


    But only the first overlay is been implemented, the seconds is not !

    


    how to archive this ?

    


    Now i wrote a PHP script that dose this filter once each time, and repeat proccess then merge all videos, but this is taking so long.

    


  • Theora puts incorrect PTS presentation time on video with held frames

    17 mars 2012, par hexatron

    I have a problem with the packet PTS/DTS on OGG Theora videos with held frames.
    Theora tries to be clever about held frames by omitting duplicate frames
    and using the packet PTS/DTS (they are equal) to skip the held frame time.

    For example, a 2-second-long 10 fps video with frames
    
  A A A A A A A A A A B C D E F G G G G G
    
should encode with PTS (the frame start) as (note the encoder adds some dup frames)
    
    A 0.0
    
    A 0.1
    
    B 1.0
    
    C 1.1
    
    D 1.2
    
    E 1.3
    
    F 1.4
    
    G 1.5
    
    G 1.9
    
But libtheora (and ffmpeg) put an incorrect time stamp on frame B
    
(the first frame following a the dup frames)
    
    B 0.6
    
This causes video to hiccup on the mislabeled frame.
    

    
My crude fix for this is to use
    
    current frame PTS =  (next frame PTS time) - (one frame time)
    
and
    
    last frame PTS = duration - (one frame time)

    (I tried submitting a bug report for theora at xiph.org, as the theora site recommends, but could not figure out how to register for a login. I also noticed the reports were several years old, so decided to document this behavior here)

  • Add custom time to video frames using ffmpeg [migrated]

    16 janvier 2014, par Marco

    I am using ffmpeg to encode raw pixels data (bgr32) into a video file.
    Pixels data is being sent from java application to ffmpeg stdin pipe.

    I am looking for a way to add a timestamp overlay to each frame in the encoded fideo file.
    It looks like there is a way to add a timestamp of current time.
    The instructions could be found here : http://einar.slaskete.net/2011/09/05/adding-time-stamp-overlay-to-video-stream-using-ffmpeg/

    Video files that I am encoding were captured few days ago and I need to add a custom time to each frame. For example 12/12/2013 11:11:45 and not the current time.

    Is it possible to do something like it using ffmpeg ?

    Thank you for your help.

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