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Sur d’autres sites (4619)

  • ffmpeg - different video and audio length synchronization

    4 mai 2020, par Halil Han Badem

    I have a task where the sound is longer and the image should come later.
Actually, this is exactly what I want, but it's a bit different : ffmpeg : mix audio and video of different length

    



    First of all, I leave the picture I draw below to be understood.
Click to see the image.

    



    By doing this I am thinking of catching sync. With which ffmpeg command can I do this ?
Thank you.

    


  • avcodec/libx265 : improve full range flag setting logic

    17 août 2021, par Jan Ekström
    avcodec/libx265 : improve full range flag setting logic

    Unlike libx264, libx265 does not have a separate "unspecified"/"auto"
    
default for color range, so we do always have to specify it.
    
Thus, we are required to handle the RGB case on the libavcodec
    
side to enable the correct value to be written out in in case
    
of RGB content with unspecified color range being received.
    

    In other words :
    
1. If the user has set color range specifically, follow that.
    
2. If the user has not set color range specifically, set full
    
   range by default in case of RGB and YUVJ pixel formats.
    • [DH] libavcodec/libx265.c

  • ffmpeg : mix audio and video of different length

    24 octobre 2016, par user3445678

    I have 2 files : 1 video file (without sound) - length 6 seconds, 1 audio - length 10 seconds.
    Both audio and video contains same conversation, but audio starts 4 seconds earlier and after that was started video.

    [----------] audio
    
    [------] video

    So, I want to mix them together to video file with length 10 seconds where first 4 seconds black screen with audio then goes real video and audio.

    [====------] audio+video (where '=' is black screen)

    I hope my description was clear enough ).
    How can I do this with ffmpeg or gstreamer ?

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