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Autres articles (60)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (5663)

  • ffmpeg efficiently compare a png logo with video except png's transparent background pixels

    17 décembre 2022, par Thm Lee

    I want to find frames with the logo image from video, and to concat theses frames without commercials for getting ad-free video.
I tried this first by using ffmpeg & jpg logo image.

    


    ffmpeg -i input.mp4 -loop 1 -i logo.jpg -an -filter_complex crop=47:25:639:24,"blend=difference:shortest=1,blackframe=95:60" -f null -


    


    And it works, but in the case by case, less accurate with blackframe setting number.
So, for getting more accuracy I tried png logo image with transeparent background.

    


    ffmpeg -i input.mp4 -loop 1 -i logo.png -an -filter_complex crop=47:25:639:24,"blend=difference:shortest=1,blackframe=95:60" -f null -


    


    But on the contrary of my idea, the results came out worse than jpg logo. It seems that the cause is why ffmpeg compare the png's transparent background part pixels too with video.

    


    Is there a way to compare png logo with video except png logo's transparent part pixels ?

    


    I'd appreciate your advice, thank you.

    


  • How ffmpeg efficiently compare a png logo with video except png's transparent background pixels ?

    17 décembre 2022, par Thm Lee

    I want to find frames with the logo image from video, and to concat theses frames without commercials for getting ad-free video.
I tried this first by using ffmpeg & jpg logo image.

    


    ffmpeg -i input.mp4 -loop 1 -i logo.jpg -an -filter_complex crop=47:25:639:24,"blend=difference:shortest=1,blackframe=95:60" -f null -


    


    And it works, but in the case by case, less accurate with blackframe setting number.
So I tried png logo image with transeparent background.

    


    ffmpeg -i input.mp4 -loop 1 -i logo.png -an -filter_complex crop=47:25:639:24,"blend=difference:shortest=1,blackframe=95:60" -f null -


    


    But on the contrary of my idea, the results came out worse than jpg logo. It seems that the cause is why ffmpeg compare the png's transparent background part pixels too with video.

    


    Is there a way to compare png logo with video except png logo's transparent part pixels, and efficiently find frames with logo in the position of video ?

    


    I'd appreciate your advice, thank you.

    


  • mov : Compare frag times in correct time base when seeking a stream without a correspo...

    17 mai 2022, par Derek Buitenhuis
    mov : Compare frag times in correct time base when seeking a stream without a corresponding sidx

    Some muxers, such as GPAC, create files with only one sidx, but two streams
    
muxed into the same fragments pointed to by this sidx.
    

    Prevously, in such a case, when we seeked in such files, we fell back
    
to, for example, using the sidx associated with the video stream, to
    
seek the audio stream, leaving the seekhead in the wrong place.
    

    We can still do this, but we need to take care to compare timestamps
    
in the same time base.
    

    Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
    • [DH] libavformat/mov.c

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