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Autres articles (93)

  • 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 (10828)

  • Manually feeding x264 with my own motion data ?

    6 septembre 2011, par ldoogy

    I am trying to encode a stream using x264 (by feeding individual images), but what's unusual is that I already have some motion information for my frames. I know exactly which areas have been modified in each frame, and I know where motion has occurred in the frame.

    Is there a way to feed x264 my own motion information ? I'd like to give it motion vectors for given areas in the frame, and somehow tell it that certain areas in the frame are guaranteed to not have had any motion in them.

    I think this might significantly improve the performance of the encoding (because I'm allowing the codec to completely skip the motion estimation phase), and should also somewhat increase quality in cases where the encoder's motion estimation algos might have missed the motion that actually occurred.

    Do I need to modify the encoder in order to do this, or is this supported in the existing API ?

  • MP4 - get current subtitle text

    20 février 2019, par murrdpirate

    I’m trying to find a way to grab the current subtitle in an MP4 file. I see that ffmpeg can extract all subtitles into an .srt file, but it would be useful for me to just grab the current subtitle based on the current timestamp of a video being played. Especially useful if it can be done with python. This would be akin to opencv and moviepy, where I can extract the current frame as an image based on the current timestamp of the video.

    I see a lot of libraries that work with subtitle .srt files (e.g. pysrt) but none that access individual subtitles from a playng mp4 file.

  • ffmpeg video length is 0 when concatenating pictures

    10 novembre 2019, par iftach freund

    I’m trying to concatenate individual frames, but the video length is 0 and all frames seemingly play at once. Iv’e tried increasing the video length in ffmpeg and changing the frame rate.

    os.system('ffmpeg -f concat -i List_tb.txt -c copy output.mp4')
    
os.system("ffmpeg -i output.mp4 -filter:v fps=fps=120 output_temp.mp4")
    
os.system("ffmpeg -i output_temp.mp4 -filter:v setpts=8.0*PTS final.mp4")

    also the frame rate is the amount of frames

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