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Autres articles (66)

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Sur d’autres sites (7279)

  • ffmpeg drawtext box height variies depending on text

    13 mars 2019, par NFpeter

    I use ffmpeg with zoompan and drawtext filter. I’m writing 4 lines of text in a box.
    Now I’ve the problem that the space between the boxes variies depending on the text height.

    Is there a way to set a fixed height for the text box ?
    Or is it possible to calculate the text position depending on the current text ?

    Here my call with 2 lines of text

    ffmpeg -ss 0 -t 10 -i white.png -y -filter_complex [0:v]zoompan='z=min(zoom+0.10143,1.217217)':x=iw/2-(iw/zoom/2):y=ih/2-(ih/zoom/2):d=25*6.0760000000000005:,trim=duration=6.0760000000000005[v0];[v0]drawtext=text=f:fontcolor=white:fontsize=40:box=1:boxcolor=black@0.8:boxborderw=15:alpha=1:x=w/20:y=(h/1.11)-th*0.5[v2];[v2]drawtext=text=f:fontcolor=white:fontsize=40:box=1:boxcolor=black@0.8:boxborderw=15:alpha=1:x=w/20:y=(h/1.246)-th*0.5 -c:v libx264 -r 25 -pix_fmt yuv420p -strict -2 out.mp4

    enter image description here

  • how to us google ML kit Selfie segmentation in flutter to overlay segmented user on top of chosen image or video ? [closed]

    4 avril 2024, par Amr

    I'm working on implementing a virtual background feature using the Google ML Kit selfie segmentation Flutter plugin. The goal is to separate the user from the background live from the camera feed, overlay the user on a chosen image or video, and then create a new video combining these elements.

    


    Currently, I'm successfully obtaining the mask using the plugin. However, I'm concerned about performance issues if I directly copy pixels to achieve the overlay effect, especially in real-time scenarios.

    


    I'm looking for alternative approaches or best practices to efficiently achieve this functionality without sacrificing performance. Any insights or suggestions on how to approach this would be greatly appreciated.

    


    I thought about using ffmpeg but not sure how to take the user pixels from the camera feed, I am not a flutter developer so not sure how to do so.

    


  • flac demuxer : parse the WAVEFORMATEXTENSIBLE_CHANNEL_MASK tag

    25 mai 2014, par Anton Khirnov
    flac demuxer : parse the WAVEFORMATEXTENSIBLE_CHANNEL_MASK tag

    It is used to store the channel mask for non-standard layouts.
    • [DBH] libavformat/flacdec.c

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