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Autres articles (92)

  • L’utiliser, en parler, le critiquer

    10 avril 2011

    La première attitude à adopter est d’en parler, soit directement avec les personnes impliquées dans son développement, soit autour de vous pour convaincre de nouvelles personnes à l’utiliser.
    Plus la communauté sera nombreuse et plus les évolutions seront rapides ...
    Une liste de discussion est disponible pour tout échange entre utilisateurs.

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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.

Sur d’autres sites (10870)

  • avcodec/ffwavesynth : use uint32_t to compute difference, it is enough

    21 juin 2019, par Michael Niedermayer
    avcodec/ffwavesynth : use uint32_t to compute difference, it is enough

    Fixes : signed integer overflow : 6494225984479297536 - -6043795377581187040 cannot be represented in type 'long'
    
Fixes : 15285/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFWAVESYNTH_fuzzer-5632780307791872
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/ffwavesynth.c

  • ffmpeg to calculate audio/visual difference between compressed and non-compressed video

    14 juin 2019, par Asymetr

    I’m trying to calculate the audio + visual difference between a harshly compressed video file and one that hasn’t been.
    I’m using pipes because ultimately I wish this to take src from a camera stream.

    I’ve managed to get the video results that I’m looking for, but I’m struggling with the audio.
    I’ve added a line to invert the phase of the compressed audio, so that when they add up in the blend they should almost cancel each other out, but that doesn’t happen.

    ffmpeg -i input.avi -f avi -c:v libxvid -qscale:v 30 -c:a wmav1 - | \
    
ffmpeg -i - -f avi -af "aeval='-val(0)':c=same" - | \
    
ffmpeg -i input.avi -i - -filter_complex "blend=all_mode=difference" -c:v libx264 -crf 18 -f avi - | \
    
ffplay -

    I can still hear all the audio, when what I should be hearing are solely compression artifacts. thx

  • Difference between Deinterlace and Progressive

    21 février 2019, par Sasidharan S

    Is it deinterlace and progressive are same in ffmpeg or different ?

    If it is different how to convert from progressive scan to deinterlace in ffmpeg.

    Code I use :

    ffmpeg -ss 00:00:00.000 -t 00:01:00.000 -i 1.mp4 -ss 00:01:00.001 -t 00:02:00.000 -i 2.mp4 -filter_complex "[0:v:0] [1:v:0] concat=n=2:v=1[v] " -map "[v]" -c:v libx264 -preset fast -profile:v high -level 4.1 -coder 1 -yadif -pix_fmt yuv420p -g 50 -bf 3 -x264-params "keyint_min=50:sc_threshold=0:nal-hrd=cbr:subq=6:motion-est=1:trellis=2:8x8dct=1:b-pyramid=0" -b:v:0 500k -minrate 500k -maxrate 500k -bufsize 100k -s:v:0 512x384 -f mp4 -threads 4 -filter_complex "[0:a] [1:a] concat=n=2:v=0:a=1[a]" -map "[a]" -ar 48000 -ac 2 -b:a 128K -write_tmcd off SD_4X3_500k_1.mp4

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