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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • 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.

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

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  • Generating number of thumbnails depending on video size using AWS MediaConvert

    1er décembre 2020, par sakhunzai

    After reading this article I get the sense that AWS media convert job template cannot be re-used to generate thumbnails of arbitrary video size. The article assumes that we know the size/duration of video uploaded upfront hence the number of thumbnails we desire.

    


    What I am looking for is to generate a random number of thumbnails based of video size (e.g large number of thumbnails for large video and small number of thumbnails for small video). I approached this solution using lambda trigger and ffmpeg lambda layer but lambda function timeouts (15 minutes max) for videos larger than 150MB (since it takes time to read the video from the s3 bucket).

    


    What are my options to process large number of video , generate a variable number of thumbnails, merge those thumbs to generate a sprite ?

    


    I tried lambda trigger with ffmpeg/ffprob to generate sprite, but that has timeout issue. Now I have setup a cloud watch event rule to trigger lambda function on mediaconvert job status change( completed)
and merge the thumbs to generate sprite, which seems much lighter but I need an arbitrary number of thumbs.

    


  • swscale/aarch64 : use multiply accumulate and shift-right narrow

    9 décembre 2019, par Sebastian Pop
    swscale/aarch64 : use multiply accumulate and shift-right narrow

    This patch rewrites the innermost loop of ff_yuv2planeX_8_neon to avoid zips and
    
horizontal adds by using fused multiply adds. The patch also uses ld1r to load
    
one element and replicate it across all lanes of the vector. The patch also
    
improves the clipping code by removing the shift right instructions and
    
performing the shift with the shift-right narrow instructions.
    

    I see 8% difference on an m6g instance with neoverse-n1 CPUs :
    
$ ffmpeg -nostats -f lavfi -i testsrc2=4k:d=2 -vf bench=start,scale=1024x1024,bench=stop -f null -
    
before : t:0.014015 avg:0.014096 max:0.015018 min:0.013971
    
after :  t:0.012985 avg:0.013013 max:0.013996 min:0.012818
    

    Tested with `make check` on aarch64-linux.
    

    Signed-off-by : Sebastian Pop <spop@amazon.com>
    
Reviewed-by : Clément Bœsch <u@pkh.me>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libswscale/aarch64/output.S

  • swscale : aarch64 : Optimize the final summation in the hscale routine

    20 avril 2022, par Martin Storsjö
    swscale : aarch64 : Optimize the final summation in the hscale routine

    Before :                     Cortex A53      A72      A73  Graviton 2  Graviton 3
    
hscale_8_to_15_width8_neon :     8273.0   4602.5   4289.5      2429.7      1629.1
    
hscale_8_to_15_width16_neon :   12405.7   6803.0   6359.0      3549.0      2378.4
    
hscale_8_to_15_width32_neon :   21258.7  11491.7  11469.2      5797.2      3919.6
    
hscale_8_to_15_width40_neon :   25652.0  14173.7  12488.2      6893.5      4810.4
    

    After :
    
hscale_8_to_15_width8_neon :     7633.0   3981.5   3350.2      1980.7      1261.1
    
hscale_8_to_15_width16_neon :   11666.7   5951.0   5512.0      3080.7      2131.4
    
hscale_8_to_15_width32_neon :   20900.7  10733.2   9481.7      5275.2      3862.1
    
hscale_8_to_15_width40_neon :   24826.0  13536.2  11502.0      6397.2      4731.9
    

    Thus, this gives overall a 8-29% speedup for the smaller filter
    
sizes, around 1-8% for the larger filter sizes.
    

    Inspired by a patch by Jonathan Swinney <jswinney@amazon.com>.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] libswscale/aarch64/hscale.S

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