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Sur d’autres sites (4762)

  • dvdsubdec : reset buffer size on invalid over-large packets

    28 mai 2015, par wm4
    dvdsubdec : reset buffer size on invalid over-large packets

    Otherwise it will never be reset, and remain "stuck" in this state
    
forever. Can happen when seeking : the decoder will receive fragments
    
from different file positions, which triggers the condition easily.
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavcodec/dvdsubdec.c

  • Crop video into a 4x4 grid/tiles/matrix efficiently via command-line ffmpeg ?

    22 avril 2017, par Dylan

    Hello Stackoverflow community !

    I dread having to ask questions, but there seems to be no efficient way to take a single input video and apply a matrix transformation/split the video into equal sized pieces, preferably 4x4=16 segments per input.

    I tried using all the libraries such as ffmpeg and mencoder, but having 16 outputs can be as slow as 0.15x. The goal of my project is the split the video into 16 segments, rearrange those segments and combine back into a final video ; later reversing the process in HTML5 canvas. Here is a picture to help you understand what I am talking about :
    the source but also the final destination after reorganizing the pieces

    after the segments are exported, I will recombine the pieces in a puzzle manner (they are also inverted and rotated but unrelated)

    I do not believe you can do this all in one command, so my goal is to crop into 16 mapped outputs quickly, then reassemble them in a different order. But I can do the other parts myself. Ideally there would be a way to move pixel blocks eg 100x100 and just move them around. My math is not strong enough..
    I really appreciate the work you guys do !

    admin@dr.com

  • avformat/mp3dec : change bogus error message if read_header encounters EOF

    12 mai 2024, par Marton Balint
    avformat/mp3dec : change bogus error message if read_header encounters EOF

    Because of ffio_ensure_seekback() a seek error normally should only happen if
    
the end of file is reached during checking for the junk run-in. Also use proper
    
error code.
    

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] libavformat/mp3dec.c

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