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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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  • Les autorisations surchargées par les plugins

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Sur d’autres sites (15231)

  • Ffmpeg blur part of video interacively

    8 septembre 2020, par R N

    I want to blur part of live stream conditionally in realtime with ffmpeg.
    
I read about zeromq filter, but the output of ffmpeg -filters says that boxblur filter doesn't support commands. For example, I want to blur the bottom half of the video then after some time disable blur then blur all video.
    
How can I achieve this ?

    


  • ffmpeg webcam capture a/v out of sync

    7 juillet 2014, par Cameron Ball

    I’m running this command to capture video and audio from my webcam :

    ffmpeg -y -f video4linux2 -s 320x240 -i /dev/video0 -f alsa -i "plughw:CARD=U0x46d0x825,DEV=0" -ac 2 -strict experimental Filename.mp4

    It works, but the audio is about half a second behind the video (EG if I clap, when I watch the video I’ll hear the clap and then see me do it).

    This is for an online stream, so I can’t fix it up later, it needs to be recorded correctly.

    It always seems to be off by the same amount, so I’m trying to find an option to simply delay when audio starts recording, but I can’t figure it out.

    Any ideas ?

  • ffmpeg - how to apply filters without losing quality

    20 mai 2024, par Mickey

    Here is a simple request, it has an input, output, and two watermarks. From what I gathered I can't apply -codec copy because I'm using a filter.

    



    ffmpeg -i input.mp4 -i wm-bl.png -i wm-br.png -filter_complex "overlay=x=0:y=H-h,overlay=x=W-w:y=H-h" output.mp4


    



    This does the trick, as far as watermarking is concerned, but the output is compressed into half the original file size.

    



    Is it possible to watermark without losing video quality ?

    


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