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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
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  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
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Sur d’autres sites (8289)

  • x86/tx_float : implement inverse MDCT AVX2 assembly

    3 septembre 2022, par Lynne
    x86/tx_float : implement inverse MDCT AVX2 assembly

    This commit implements an iMDCT in pure assembly.
    

    This is capable of processing any mod-8 transforms, rather than just
    
power of two, but since power of two is all we have assembly for
    
currently, that's what's supported.
    
It would really benefit if we could somehow use the C code to decide
    
which function to jump into, but exposing function labels from assebly
    
into C is anything but easy.
    
The post-transform loop could probably be improved.
    

    This was somewhat annoying to write, as we must support arbitrary
    
strides during runtime. There's a fast branch for stride == 4 bytes
    
and a slower one which uses vgatherdps.
    

    Zen 3 benchmarks for stride == 4 for old (av_imdct_half) vs new (av_tx) :
    

    128pt :
    
   2811 decicycles in         av_tx (imdct),16775916 runs,   1300 skips
    
   3082 decicycles in         av_imdct_half,16776751 runs,    465 skips
    

    256pt :
    
   4920 decicycles in         av_tx (imdct),16775820 runs,   1396 skips
    
   5378 decicycles in         av_imdct_half,16776411 runs,    805 skips
    

    512pt :
    
   9668 decicycles in         av_tx (imdct),16775774 runs,   1442 skips
    
  10626 decicycles in         av_imdct_half,16775647 runs,   1569 skips
    

    1024pt :
    
  19812 decicycles in         av_tx (imdct),16777144 runs,     72 skips
    
  23036 decicycles in         av_imdct_half,16777167 runs,     49 skips
    • [DH] libavutil/tx.c
    • [DH] libavutil/tx_priv.h
    • [DH] libavutil/x86/tx_float.asm
    • [DH] libavutil/x86/tx_float_init.c

  • ffmpeg scaling nvenc maintaining aspect ratio

    3 novembre 2019, par Sambir

    I want to fully hw transcode mkv files to mp4 and up- /downscale the content maintaning the aspect ratio.

    With CPU based transcoding you just add :

    scale=1920:1080:force_original_aspect_ratio=decrease

    With HW (CUDA) transcoding either -resize on Decoding side or -scale_npp on encoding side is possible but both dont seem to be capable to force original acpect ratio.

    I want to for instance upscale 1920x800 file to 1920x1080 while filling the rest with black bars so I can overlay subtitles over the bars for instance...

    With this i can fully transcoding using GPU power reather than utilizing cpu. any ideas ?

  • record desktop save every 30 minutes

    31 mars 2014, par Maged E William

    here is my question that related to the same problem :

    better way to record desktop via ffmpeg

    I have this command : ffmpeg -f dshow -i video="screen-capture-recorder" -r 30 -t 10 E:\test01.flv

    And i am happy with it, but i wonder if i can make it save every 30 minutes so if the power went off i only loses the last 30 minutes.

    I use C# to launch and hide ffmpeg cmd, so i wonder how to make it save to the same test01.flv every 30 minutes ?

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