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Autres articles (70)

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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
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    MediaSPIP is currently available in French and English (...)

Sur d’autres sites (9728)

  • How to start music at a specific time

    16 mars 2019, par INeed ADollar

    I want to start a song file at a specific time with ffmpeg in python and I don’t know if this is possible. I make a discord bot and I want to make a command about this. Thank you for any help !

  • How to cut using ffmpeg using start and end time not duration ?

    16 octobre 2020, par Joan Venge

    I have seen many links that shows specifying the start time and duration but I want to specify the start and end time. From example from 5 min mark to 12 min mark. How to do this using ffmpeg ?

    


  • avcodec/mpeg12dec : Sanitize start codes earlier

    20 septembre 2019, par Andreas Rheinhardt
    avcodec/mpeg12dec : Sanitize start codes earlier

    The MPEG-1/2 decoder uses avpriv_find_start_code to search for start
    
codes and worked with the resulting start code before checking that it
    
is really a start code of a slice. In particular, if the picture is so
    
big that a slice_vertical_position_extension is present, it added the
    
slice_vertical_position_extension as if it had a slice. Then a left
    
shift is performed, without making sure that the value to be shifted is
    
nonnegative.
    
Afterwards the end result is checked, but even if a start code of a
    
non-slice has been found, it might pass these checks : If
    
slice_vertical_position_extension is present a start code <
    
SLICE_MIN_START_CODE can lead to a macroblock-row index that appears
    
valid. Furthermore, the left shift might make an invalid start code
    
appear valid by discarding the highest bit.
    
This has been fixed by checking directly after avpriv_find_start_code
    
has returned.
    

    Fixes ticket #8162 (which is about the undefined left shifts).
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavcodec/mpeg12dec.c

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