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Sur d’autres sites (8239)

  • how to set effect on video in android programmatically ?

    12 mai 2016, par Mayank Sugandhi

    I have video which is save in sdcard, now i want to apply the effect like black and white and etc. it’s functionality like editing in video which is already in photo editor or video editor applications.

    now i want to that functionality in android programmatically ? when user choose black and white color in option then it should be response very quickly and change the effect of our video and save it sdcard.

    i have find some solution for this like,

    https://github.com/krazykira/VidEffects

    but it has not save functionality of video and if i go through in
    "FFMPEG" library then it is not responding very quickly ?

    how can i change the effect of video and save this video in sdcard ?

    Thank You

  • FFmpeg Drawtext Fade Out Performance

    16 août 2021, par Ben Boyle

    I am developing an application that makes system calls to FFmpeg.

    


    I found a way to get the drawtext filter isolated and fade out, but the render time increased about 5x.

    


    I just want to see if there is something obviously wrong with the command I came up with.

    


    ffmpeg -y -i input.mp4 -c:v libx264 -filter_complex "[0]scale=1920:1080,format=rgba, split[base][text];[text]drawtext=fontfile=font1.ttf:text='Text1':fontcolor= 'white':fontsize=34:box=1:boxcolor=mediumpurple:boxborderw=50:x=0:y=690,format=yuva444p,drawtext=fontfile=./resources/fonts/font2.ttf:text='Text2':fontcolor='white':fontsize=26:x=0:y=725,fade=t=out:st=12:d=0.2:alpha=1[title];[base][title]overlay" -force_key_frames "expr:gte(t,n_forced*0.05)" output.mp4


    


  • FFMPEG Encoding to prores 4444 with alpha doesn't retain original alpha [closed]

    19 mai 2023, par Nick Weeden

    I'm trying to convert an rgba png to prores 4444 with an alpha. When I run the following command it will create prores file with an alpha. But, the alpha is full white, it doesn't retain the values I put in.

    


    ffmpeg -start_number 1001 -r 24.000 - "pngWithAlpha_%06d.png" -c:v prores_ks -profile:v 4 -alpha_bits 16 -y "proresWithAlpha.mov"


    


    I've tried this with both FFMPEG 4.2.2 and 6.0.0 on a linux system, I'm not sure if I'm doing it wrong or if it is a bug.

    


    Looking at this post it seems it should be possible (they're complaining about quality not a fully missing transfer of the alpha).

    


    I would expect it to pass the alpha straight through but it doesn't. I used alpha_extract to copy the alpha in to the rgb to confirm I'm able to read the alpha from the png, which worked. But the alpha was still full white.

    


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