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  • Publier sur MédiaSpip

    13 June 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • Encoding and processing into web-friendly formats

    13 April 2011, by

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Les formats acceptés

    28 January 2010, by

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

On other websites (7629)

  • Trying to convert an MP4 to WEBP with ffmpeg with different lossless/compression settings, but getting the same result

    10 November 2023, by corgrath

    I am trying to convert an MP4 video to WEBP.

    


    I am trying different -lossless and -compression_level settings (as described here), but all the output videos have identical disk size.

    


    -lossless can either be 0 or 1 and -compression_level can be from 0 to 6

    


    For example

    


    ffmpeg -y -i input.mp4 -vcodec libwebp -lossless 1 -compression_level 6 \
  -loop 0 -preset default output_lossless1_comp6.webp


    


    and

    


    ffmpeg -y -i input.mp4 -vcodec libwebp -lossless 0 -compression_level 0 \
  -loop 0 -preset default output_lossless0_comp0.webp


    


    What have I missed here?

    


  • ffmpeg best parameteres for fastest compression on FullHD mp4?

    3 August 2021, by Mike Azatov

    I need to compress a bunch of FullHD(1920x1080, 3Gb, mp4) videos, each 2 hrs long. Some loss of quality is okay as is the lower resolution. I'm shooting for a 500Mb output video in 10 min processing time (2080TI Ryzen 9 3900X). It is important for the videos to be completely in sync, so frame x in the input video matches frame x in output. For this, I'm using -vsync 0

    


    My current working settings which get me to 500MB size in 20 minutes.

    


    ffmpeg -i input_fullhd.mp4 -vcodec libx265 -crf 28 -vsync 0 -vf scale=800:-1 -preset medium output.mp4

    


    I'd like it to be faster with potentially slightly better quality.

    


    My concern is that I'm not utilizing my GPU at all and my CPU shows only 30% utilization. So feels like it should be possible to speed this up. I tried adding -hwaccel cuda but that made things a bit slower.

    


    Are there any other settings I can try that I'm missing to either improve my conversion or utilize more resources for speed?

    


    Thanks

    


  • Is it possible to compression and scaling in single command using ffmpeg?

    30 July 2021, by Nikunj Chaklasiya

    I used this command for Image compression:

    


    "ffmpeg -hide_banner -i in.png -pix_fmt pal8 -vf dctdnoiz=4.5 -y out_2.png"


    


    and this command for scaling:

    


    "ffmpeg -i 1.png -vf scale=250:250 output_250x250.png"


    


    I'm new to FFmpeg and I have tried my first and second command in FFmpeg.
I tried the below command.

    


    ffmpeg -hide_banner -i in.png -pix_fmt pal8 -vf scale=250:250 dctdnoiz=4.5 -y out_2.png


    


    But, It's not working and outputs this error:

    


    [NULL @ 0x562190cf5140] Unable to find a suitable output format for 'dctdnoiz=4.5'
dctdnoiz=4.5: Invalid argument


    


    How is it possible or how to get it to work or do I need to make two FFmpeg instance for doing this?

    


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