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Autres articles (35)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • 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" (...)

  • 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

Sur d’autres sites (5620)

  • FFMPEG : Transcode H265 10-bit to H264 8-bit without color loss

    24 novembre 2020, par Abhinandan Chakraborty

    I'm testing FFMPEG on my server. I'm trying to transcode H265 10-bit to H264 8-bit to support playing the video on all major web browser.

    


    1. This is the first command :

    


    ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -preset ultrafast out.mp4


    


    Result : Video only playable on VLC media player. Doesn't play on any browser

    


    2. Then I tried using this command :

    


    ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuv420p" out.mp4


    


    Result : Video is playable everywhere but massive color loss.

    


    3. Then I tried another command :

    


    ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuvj420p" out.mp4


    


    Result : Video is playable everywhere but increased color range

    


    I don't know if I am missing anything or If I should completely disallow users to upload video with 10-bit depth. Any help will be greatly appreciated

    


    If anyone interested in the video which I am testing on then here is the link : https://drive.google.com/uc?export=download&id=1pGsnknkoIDRPKrW-YPFS7U31J09PeM4N

    


    I followed through many google results to come up with these command, Some of them are :

    


      

    1. FFMPEG Transcode H265 video from 10-bit to 8-bit

      2. 


    2. https://blender.stackexchange.com/questions/73743/lossless-10-bit-colorspace-yuvj420p-video-output

      3. 


    3. https://askubuntu.com/questions/922563/set-bit-depth-in-ffmpeg-encoding-for-hevc

      4. 


    


  • ffmpeg, get thumbnails but only part of the picture size [closed]

    29 mars 2013, par thevoipman

    I want to take a screenshot/thumbnail from a clip size is 1024x780, but I don't want the entire height, I just want the screenshot to take 768 x 80% of the height.... this is because I don't want any subtitles to be included in the thumbnails etc....

    I'm currently using the following command to get screenshots :

    ffmpeg -i "\"$OUTPUT_DIRECTORY/abc$OUTPUTFILENAME\"" -f image2 -ss ""$CURRENTPOSITION"" -s 768x432 -vf fps=fps=1/10 -vframes 20 "\""$OUTPUT_DIRECTORY/$RANDOM6%03d.jpg\""

    The goal is to end up a thumbnail size 768x432, but the height 432 is only 80% of the height of the original video file.

    Any kind of help I can get on this is greatly appreciated !

  • FFmpeg : how to burn subtitles into only part of the video ?

    30 octobre 2018, par xiatian

    I have a video which lasts for an hour but the ass subtitle only has the first 30 seconds. I want to burn this 30 seconds subtitle file into this video. Here are two options I have tried :

    • ffmpeg -i a.mp4 -vf "ass=a.ass" -ss 00:00:00 -t 30 b.mp4
      Then I only get a 30-second long video.

    • ffmpeg -i a.mp4 -vf "ass=a.ass"  b.mp4 I can get the whole one-hour long video but it takes a long time !

    How can I only encode only the first 30 seconds of this video and keep the rest of it unchanged (like the copy option) so that it takes less time to finish this burning process ?

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