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Autres articles (33)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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" (...)

  • Publier sur MédiaSpip

    13 juin 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

Sur d’autres sites (6347)

  • lavfi/volume : fix NULL reference in filter_frame()

    25 décembre 2013, par Stefano Sabatini
    lavfi/volume : fix NULL reference in filter_frame()

    Fix crash.
    • [DH] libavfilter/af_volume.c

  • too long video trace file volume ?

    12 juin 2021, par david

    I have produced an XML trace file of a 20-sec video and the volume of this trace file is 8.57 Gigabyte !! the videos is encoded using this command :

    


    ffmpeg  -i  input_1080p60.mp4  -c:v  libx264 -pix_fmt yuv420p  -b:v 8000K -bufsize 8000K -minrate 8000K -maxrate 8000K -x264opts keyint=120:min-keyint=120 -preset veryfast -profile:v high out_1080p.mp4


    


    then I used the following command I changed the format in .264 because the input of JM software for producing an XML trace file is .264 :

    


    ffmpeg  -i  out_1080p.mp4  -c:v  libx264 -pix_fmt yuv420p  -b:v 8000K -bufsize 8000K -minrate 8000K -maxrate 8000K -x264opts keyint=120:min-keyint=120 -preset veryfast -profile:v high out_1080p.264


    


    after using JM using the following code :

    


    ldecod.exe -i E:\software\out_1080p.264 -o E:\software\out.yuv -xmltrace out_1080p_xml.xml


    


    it is really weird for me. because I have more than 1000 videos that I need to produce their trace files and I do not know what should I do with this size of the trace file. furthermore, I can not open a file with this volume and no software can open the file !! :((. could you please tell me what is the problem ? and how can I solve it ? do you know another way to produce this trace file ?
THanks

    


  • FFmpeg Audio DPLII + Volume normalization seems failing

    10 avril 2017, par vit123

    Kind FFMpeg experts,

    I’m using the last FFmpeg version 3.2.4, my target is to normalize the DPLII output from a multichannel (e.g. DTS-HD) stream, by just the following two FFMpeg commands :

    1) ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix,volumedetect" -f null NUL

    so detecting for example : "max_volume : -6.2 dB"
    then :

    2) ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix,volume=6.199dB" myOutput.wav

    The big problem is that the WAV output I get is severely clipped and completely different from what I get issuing the following 2 separated commands after the (same) 1st one :

    2a) ffmpeg -i myInput.dtshd -af "aresample=matrix_encoding=dplii:ocl=downmix" myOutputLowVol.wav

    2b) ffmpeg -i myOutputLowVol.wav -af "volume=6.199dB" theCorrectOutput.wav

    Now the big question is : shouldn’t be the command 2) exactly equivalent to commands 2a) + 2b) ?
    Whyever I get 2 very different results : in the 1st case I get an "over-volumed" audio, in the 2nd case I get a perfectly normalized audio ?

    Am I missing anything ? is this a bug ?
    Thanks a lot for your help !

    Vittorio

    P.S.
    please note that issuing a "volumedetect" on "myOutputLowVol.wav", I get just the same "max_volume" resulting from 1), as expected, so the problem seems being all on command 2)

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