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Autres articles (34)

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    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
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  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

  • De l’upload à la vidéo finale [version standalone]

    31 janvier 2010, par

    Le chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
    Upload et récupération d’informations de la vidéo source
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    Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)

Sur d’autres sites (5828)

  • How to create an encoding ladder for any aspect ratio ?

    18 avril 2024, par volume one

    For a given video uploaded by a user, I need to create three versions of it to cover standard definition (SD), high definition (HD), full high definition (FHD), and ultra high definition (UHD e.g. 4K). "resolution/encoding ladders" for standard aspect ratios like 16:9 and 4:3.

    


    For 4:3 we might have :

    


    640 x 480
960 x 720
1440 x 1080
2880 x 2160


    


    For 16:9 we might have :

    


    854 x 480
1280 x 720
1920 x 1080
3840 x 2160


    


    If a user uploads a file in either of those aspect ratios, we can create the four different versions because the resolution standards are known.

    


    However if a user uploads a video with an unforseen aspect ratio, say 23:19, then how would you go about formatting that video into SD, HD, FHD, and UHD versions ?

    


    If a 23:19 video is indeed uploaded then I am not looking to resize it to fit a different 'standard' aspect ratio. It must remain the same aspect ratio, but have four quality versions. The problem is what height and width sizes to create for non-standard resolutions ?

    


    I have already come accross many aspect ratios like 16:10, 21:9, 1.85:1, 2.39:1. How could I take care of making quality variations of those ?

    


    I am using Node.js and FFMpeg for video processing.

    


  • Overlay a 16/9 video to a 9/16 ratio and shrink the original video [closed]

    6 avril 2024, par thanhbo

    I assume the video has an aspect ratio of 16/9 (size 1920:1080). I want to convert it to 9/16 ratio and shrink the original video. The formula I wrote is as follows but there is an error. I hope someone can help, thank you.

    


    ffmpeg -y -i A1.mp4 -filter_complex "split[crp0][crp1];[crp0]scale=iw:2*trunc(iw*16/18),boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=11,setsar=1[bg],[1:v]scale=(iw-100):-1[bg2];[bg][bg2]overlay=(W-w)/2:(H-h)/2[bg3]" -map "[bg3]" bg3.mp4

ffmpeg -y -i A1.mp4 -filter_complex "split[crp0][crp1];[crp0]scale=iw:2*trunc(iw*16/18),boxblur=luma_radius=min(h\,w)/20:luma_power=1:chroma_radius=min(cw\,ch)/20:chroma_power=11,setsar=1[bg],[1:v]scale=(iw-100):-1[bg2];[bg][bg2]overlay=(W-w)/2:(H-h)/2[bg3]" -map "[bg3]" bg3.mp4


    


  • avcodec/av1dec : don't set aspect ratio when it's not yet known

    6 septembre 2023, par James Almer
    avcodec/av1dec : don't set aspect ratio when it's not yet known

    Makes the output of the native decoder consistent with external decoders like
    
libdav1d with fate-enhanced-flv-av1.
    

    Reviewed-by : Zhao Zhili <quinkblack@foxmail.com>
    
Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/av1dec.c
    • [DH] tests/ref/fate/enhanced-flv-av1

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