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Autres articles (105)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • 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 (...)

Sur d’autres sites (8181)

  • How to detetc hardware acceleration in ffmpeg

    19 décembre 2020, par Ali Razmkhah

    I am writing c++ program to screen record by ffmpeg 4.3 ! I need to detect hardware acceleration support such as h264_qsv or h264_nvenc without running ffmpeg.exe !

    


    I explored ffmpeg.exe source code and found no results ! some solutions are deprecated or dose not work on 4.3 !
As instance,

    


    avcodec_find_encoder_by_name("h264_qsv")


    


    returns null even it is exist and works properly !

    


  • lavfi/qsvvpp : support async depth

    31 mars 2021, par Fei Wang
    lavfi/qsvvpp : support async depth

    Async depth will allow qsv filter cache few frames, and avoid force
    
switch and end filter task frame by frame. This change will improve
    
performance for some multi-task case, for example 1:N transcode(
    
decode + vpp + encode) with all QSV plugins.
    

    Performance data test on my Coffee Lake Desktop(i7-8700K) by using
    
the following 1:8 transcode test case improvement :
    
1. Fps improved from 55 to 130.
    
2. Render/Video usage improved from 61%/ 38% to 100%/ 70%.(Data get
    
from intel_gpu_top)
    

    test CMD :
    
ffmpeg -v verbose -init_hw_device qsv=hw :/dev/dri/renderD128 -filter_hw_device                 \
    
 hw -hwaccel qsv -hwaccel_output_format qsv -c:v h264_qsv -i 1920x1080.264                     \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null - \

    - vf 'vpp_qsv=w=1280:h=720:async_depth=4' -c:v h264_qsv -r:v 30 -preset 7 -g 33 -refs 2 -bf 3 -q 24 -f null -
    

    Signed-off-by : Fei Wang <fei.w.wang@intel.com>
    
Reviewed-by : Linjie Fu <linjie.justin.fu@gmail.com>
    
Signed-off-by : Zhong Li <zhongli_dev@126.com>
    • [DH] libavfilter/qsvvpp.c
    • [DH] libavfilter/qsvvpp.h
    • [DH] libavfilter/vf_deinterlace_qsv.c
    • [DH] libavfilter/vf_vpp_qsv.c

  • lavc/apv : AVX2 transquant for x86-64

    19 avril, par Mark Thompson
    lavc/apv : AVX2 transquant for x86-64

    Typical checkasm result on Alder Lake :
    

    decode_transquant_8_c :                                 464.2 ( 1.00x)
    
decode_transquant_8_avx2 :                               86.2 ( 5.38x)
    
decode_transquant_10_c :                                481.6 ( 1.00x)
    
decode_transquant_10_avx2 :                              83.5 ( 5.77x)
    • [DH] libavcodec/apv_dsp.c
    • [DH] libavcodec/apv_dsp.h
    • [DH] libavcodec/x86/Makefile
    • [DH] libavcodec/x86/apv_dsp.asm
    • [DH] libavcodec/x86/apv_dsp_init.c
    • [DH] tests/checkasm/Makefile
    • [DH] tests/checkasm/apv_dsp.c
    • [DH] tests/checkasm/checkasm.c
    • [DH] tests/checkasm/checkasm.h
    • [DH] tests/fate/checkasm.mak

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