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  • List of compatible distributions

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    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
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Sur d’autres sites (4825)

  • Revision 1ca4d51b2e : Refactor to remove GLOBAL_MOTION Make the vp9_int_pro_motion_estimation() funct

    11 mars 2015, par Jingning Han

    Changed Paths :
     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_mcomp.c



    Refactor to remove GLOBAL_MOTION

    Make the vp9_int_pro_motion_estimation() function return zero
    motion vector if high bit depth is turned on, instead of removing
    it from compiled codes.

    Change-Id : Ia48f010eb590b2d517d5678c394110b326a1a95e

  • lavc/vc1dsp : R-V V vc1_unescape_buffer

    12 mai 2024, par Rémi Denis-Courmont
    lavc/vc1dsp : R-V V vc1_unescape_buffer

    Notes :

    - The loop is biased toward no unescaped bytes as that should be most common.

    - The input byte array is slid rather than the (8 times smaller) bit-mask,
    
  as RISC-V V does not provide a bit-mask (or bit-wise) slide instruction.

    - There are two comparisons with 0 per iteration, for the same reason.

    - In case of match, bytes are copied until the first match, and the loop is
    
  restarted after the escape byte. Vector compression (vcompress.vm) could
    
  discard all escape bytes but that is slower if escape bytes are rare.
    

    Further optimisations should be possible, e.g. :

    - processing 2 bytes fewer per iteration to get rid of a 2 slides,

    - taking a short cut if the input vector contains less than 2 zeroes.
    
But this is a good starting point :
    

    T-Head C908 :
    
vc1dsp.vc1_unescape_buffer_c :      12749.5
    
vc1dsp.vc1_unescape_buffer_rvv_i32 : 6009.0
    

    SpacemiT X60 :
    
vc1dsp.vc1_unescape_buffer_c :      11038.0
    
vc1dsp.vc1_unescape_buffer_rvv_i32 : 2061.0
    • [DH] libavcodec/riscv/vc1dsp_init.c
    • [DH] libavcodec/riscv/vc1dsp_rvv.S

  • How to convert Raw frames in a video file in C language ?

    3 décembre 2020, par Nicola Revelant

    My C program generates raw frames, using either a pixel matrix or a linear pixel vector (I prefer the matrix for efficiency) ; but I also want to generate a video by merging all the frames. The FFmpeg library seems so complex and poorly documented so if anyone knows how simple it is to do it ...

    


    Please don't advise me how to use the standalone Linux ffmpeg command because it is not usable for this purpose.

    


    PS. It is used to generate Mandelbrot videos.

    


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