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    21 juin 2013, par

    Ecrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
    Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
    Vous pouvez personnaliser le formulaire de création d’un éditorial.
    Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...)

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    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

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  • ffmpeg - converting webm videos generated by Chrome is slow

    2 juin 2024, par Nuthinking

    I generate webm files in two different ways. One using Chrome WebRTC MediaRecorder, the other one is using a js library which generates the webm video frame by frame (webm-writer-js). The file size of the videos generated is not that different, the fast one is 60% of the slow one but the difference in speed is 1000%

    



    Using the basic ffmpeg syntax -i input.webm output.mp4 the files created with Chrome's media recorder take in fact almost 10x time to be converted. The conversion logs differ slightly but overall look very similar to my novice eyes. On the left the fast conversion and on the right the slow one.

    



    enter image description here

    



    The fast one throws a little error but the conversion seems successful. In the slow conversion you can see many frames processed, in the fast one as if there was only one (very fast). Using -preset veryfast cuts the speed time by half to both but the loss of quality is visible.

    



    Any idea how I could speed up the conversion for the videos generated by Chrome without compromising much in quality ? Thanks a lot !

    


  • How do you create a crossfade transition between multiple videos in FFMPEG ?

    5 janvier 2016, par Katie Yamato

    I am currently looping MP4 videos with audio through FFMPEG. Here is the code

    del intermediate1.ts
    
del f.txt
    
echo file intermediate1.ts>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    

    
ffmpeg -i "SHORT MUSIC.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts -nostdin
    
ffmpeg -f concat -i f.txt -c copy -bsf:a aac_adtstoasc "LONG MUSIC.mp4" -nostdin

    However, the transition between each instance of the videos is not smooth. It cuts off as the next instance is shown. Would there be a way create a blend/crossfade transition for the videos ?

    I have come across this method however, it is only for 2 videos
    http://superuser.com/questions/778762/crossfade-between-2-videos-using-ffmpeg

    Hope someone can help me !
    Thank you very much !!

  • How do you create a crossfade transition between multiple videos in FFMPEG ?

    15 août 2017, par Katie Yamato

    I am currently looping MP4 videos with audio through FFMPEG. Here is the code

    del intermediate1.ts
    
del f.txt
    
echo file intermediate1.ts>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    
echo file intermediate1.ts>>f.txt
    

    
ffmpeg -i "SHORT MUSIC.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts -nostdin
    
ffmpeg -f concat -i f.txt -c copy -bsf:a aac_adtstoasc "LONG MUSIC.mp4" -nostdin

    However, the transition between each instance of the videos is not smooth. It cuts off as the next instance is shown. Would there be a way create a blend/crossfade transition for the videos ?

    I have come across this method however, it is only for 2 videos
    https://superuser.com/questions/778762/crossfade-between-2-videos-using-ffmpeg

    Hope someone can help me !
    Thank you very much !!

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