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  • 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

  • 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 (...)

  • 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 (...)

Sur d’autres sites (7573)

  • Why is ffmpeg not showing SSIM results when I do -tune ssim ?

    4 février 2016, par Melanie Sclar

    I’m trying to benchmark for SSIM in FFmpeg. If I do this

    ffmpeg -i input.mp4 -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 -psnr -ssim 1 output.mp4
    

    
...
    
[libx264 @ 0x7fe85b007600] SSIM Mean Y:0.9898484 (19.935db)
    
[libx264 @ 0x7fe85b007600] PSNR Mean Y:47.666 U:54.805 V:54.799 Avg:49.010 Global:48.071 kb/s:2595.20

    I get the SSIM and PSNR in the command line. If I add the -tune, I don’t get these results anymore. What is happening ?

  • Windows media player showing wrong bit rate

    30 octobre 2011, par Akash

    I used ffmpeg to change the bit rate of a .mp3 file from 128kbps to 64kbps

    here are the final lines of output of ffmpeg :

    size=    2261kB time=00:04:49.38 bitrate=  64.0kbits/s
    
video:0kB audio:2261kB global headers:0kB muxing overhead 0.011274%

    Tough the file size is reduced by half, windows media player while playing the file shows the bit-rate is 159 K bits/second

    Any ideas on why is this so ?

  • avcodec/v210dec : add support for frame and slice threading

    25 novembre 2019, par Limin Wang
    avcodec/v210dec : add support for frame and slice threading

    1, Test server configure :
    
[root@localhost ]# cat /proc/cpuinfo  |grep "model name"
    
 model name : Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
    
 model name : Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz
    
 ...
    

    [root@localhost ]# free -h
    
              total        used        free      shared  buff/cache   available
    
              Mem :           102G        1.1G        100G         16M        657M        100G
    
              Swap :          4.0G          0B        4.0G
    

    2, Test result :
    
encode the v210 input data for testing :
    
./ffmpeg -y -i 4k_422.ts  -c:v v210 -vframes 10 test.avi
    

    master :
    
./ffmpeg -y -threads 1 -stream_loop 1000 -i ./test.avi -benchmark -f null -
    
frame=10010 fps= 60 q=-0.0 Lsize=N/A time=00:38:26.30 bitrate=N/A speed=13.7x
    
video:5240kB audio:432432kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
    
bench : utime=101.869s stime=66.181s rtime=167.996s
    
bench : maxrss=186552kB
    

    patch applied :
    
./ffmpeg -y -threads 2 -thread_type slice -stream_loop 1000 -i ./test.avi -benchmark -f null -
    
frame=10010 fps= 72 q=-0.0 Lsize=N/A time=00:38:26.30 bitrate=N/A speed=16.5x
    
video:5240kB audio:432432kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
    
bench : utime=103.562s stime=74.858s rtime=139.599s
    
bench : maxrss=188616kB
    

    ./ffmpeg -y -threads 2 -thread_type frame -stream_loop 1000 -i ./test.avi -benchmark -f null -
    
frame=10010 fps= 85 q=-0.0 Lsize=N/A time=00:38:26.30 bitrate=N/A speed=19.6x
    
video:5240kB audio:432432kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown
    
bench : utime=114.310s stime=92.685s rtime=117.693s
    
bench : maxrss=231896kB
    

    Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/v210dec.c
    • [DH] libavcodec/v210dec.h

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