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  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    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 janvier 2010, par

    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 (...)

  • Gestion de la ferme

    2 mars 2010, par

    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"

Sur d’autres sites (6936)

  • ffplay : add startup volume option

    22 décembre 2016, par Ganesh Ajjanagadde
    ffplay : add startup volume option

    Fixes Ticket 5389.
    

    Reviewed-by : Marton Balint <cus@passwd.hu>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanag@alum.mit.edu>
    • [DH] doc/ffplay.texi
    • [DH] ffplay.c

  • Detecting video volume

    27 décembre 2016, par Johnathan Kanarek

    I’m streaming few RTMP streams through nginx and I want to check every few seconds what stream has the highest volume.
    Specifically these streams are of talking heads and I assume that usually only one of them is speaking at a time, and I’m trying to find which one.
    Since nginx can output hls (Apple http live streaming) I decided to check every few seconds the last segment of each stream using ffmpeg.
    Example :

    ffmpeg -f mp3 -i /my/path/camera67/123.ts -af "volumedetect" -f null /dev/null

    For some reason the max_volume is always zero (max_volume : 0.0 dB) and mean_volume seems meaningless regarding the volume.

    1. Do you have any idea why it’s always zero ?
    2. Is there a helpful way to understand mean_volume ?
    3. Can you think of a different tool that may give me the volume (e.g. mediainfo or ffprobe) ?

    I also tried :

    ffmpeg -f lavfi -i amovie=/my/path/camera67/123.ts,volumedetect

    This time I got :

    [mpegts @ 0x130bf40] start time for stream 1 is not set in estimate_timings_from_pts
    [mpegts @ 0x130bf40] Could not find codec parameters for stream 1 (Audio : aac ([15][0][0][0] / 0x000F), 0 channels, fltp) : unspecified sample rate
    Consider increasing the value for the ’analyzeduration’ and ’probesize’ options
    [Parsed_amovie_0 @ 0x130bcc0] No audio stream with index ’-1’ found
    [lavfi @ 0x130abc0] Error initializing filter ’amovie’ with args ’/my/path/camera67/123.ts’
    amovie=/my/path/camera67/123.ts,volumedetect : Invalid argument

    Any idea ?

    Thanks,
    T.

  • doc : document cutoff option to ac3 and adjust the option’s global documentation

    30 décembre 2016, par Moritz Barsnick
    doc : document cutoff option to ac3 and adjust the option’s global documentation

    cutoff is implemented as an option global to lavc, but supported only
    
by a few encoders. This fact is now reflected in its documentation. ac3’s
    
support of this option is added for completeness.
    

    Signed-off-by : Moritz Barsnick <barsnick@gmx.net>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] doc/codecs.texi
    • [DH] doc/encoders.texi

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