Advanced search

Medias (91)

Other articles (105)

  • 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 (...)

  • Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs

    12 April 2011, by

    La manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
    Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras.

  • Gestion de la ferme

    2 March 2010, by

    La ferme est gérée dans son ensemble par des "super admins".
    Certains réglages peuvent être fais afin de réguler les besoins des différents canaux.
    Dans un premier temps il utilise le plugin "Gestion de mutualisation"

On other websites (13084)

  • ffmpeg colorspace conversion speed

    5 May 2017, by Mikhail Novikov

    I am running 2 ffmpeg commands on a fairly fast, GPU-enabled machine (AWS g2.2xlarge instance):

    ffmpeg -i ./in.mp4 -s 1280x720 -r 30 -an -f rawvideo -pix_fmt yuv420p - | cat - >/dev/null

    gives 524fps while

    ffmpeg -i ./in.mp4 -s 1280x720 -r 30 -an -f rawvideo -pix_fmt argb - | cat - >/dev/null

    just 101... it just shouldn’t, couldn’t take as much as 8ms per frame on a modern CPU, let alone GPU!

    What am i doing wrong and how can i improve speed of this?

    PS: Now this is truly ridiculous!

    ffmpeg -i ./in.mp4 -s 1280x720 -r 30 -an -f rawvideo -pix_fmt yuv420p - | ffmpeg -s 1280x720 -r 30 -an -f rawvideo -pix_fmt yuv420p -i - -s 1280x720 -r 30 -an -f rawvideo -pix_fmt argb - | cat - >/dev/null

    makes 275 fps! which is by far not perfect, but something i can live with.

    why?

    Thanks!

  • ffmpeg: How to Use Flip, Concat and Speed up Multiple Videos Together?

    5 August 2021, by ChhengRavy

    Code1: Merge Videos

    


    ffmpeg -i   input1.mp4 -i input2.mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]" -vsync 2 -map "[v]" -map "[a]"    output1.mp4


    


    Code2: Flip and Speed Up Video

    


    ffmpeg -i   outpu1.mp4 -filter_complex "[0:v]hflip,setpts=0.77*PTS;[0:a]atempo=1.3" output2.mp4


    


    How can we combine that codes together? Please Help Me!!!

    


  • ffmpeg: speed up AND rotate video

    30 July 2021, by LFPGaming

    This is my current script that I'm trying to use to speed up the playspeed and rotate my video by 90', but it doesn't work when I include the transpose=1 argument.

    


    "C:\ffmpeg-win64\bin\ffmpeg.exe" -i "C:\video1.mkv" -vf "setpts=PTS/60" "transpose=1" -an -crf 18 "C:\video2.mkv"


    


    Script works without the transpose argument and speeds up my video perfectly, but Script won't run once I try to rotate the video by 90' and outputs an error:

    


    Unable to find a suitable output format for 'transpose=1'
transpose=1: Invalid argument


    


    Can anyone tell me where I'm going wrong?

    


Browsing