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• Lib x : display problem related to window pixel color changes with the mlx_put_pixel() function [closed]

  15 janvier 2023, par Jordan Riga

  I'm stuck on a project that I have to return for school.
I have to make a 3D game with the minilibx in C, the problem being that I try to make the graphic part work but it doesn't work (display pixels on the screen).
And all this same with the examples that I found of school 42 on the internet in that link https://harm-smits.github.io/42docs/libs/minilibx.
All configuration has been done.

  


  Could there be a possible configuration problem ? I'm working on Kali Linux (Even using a VM on Ubuntu it didn't work).

  


  In short my question is what can be the different reasons why the graphical part of minilibx independently of events, loops and etc does not work without errors ?

  


• ffmpeg transparent HVEC video from alpha matte and color video

  16 janvier 2023, par James

  I have an alpha.mp4 (alpha matte video) and a color.mp4 (color video). How do I use ffmpeg to make a transparent HVEC (.mov) video ?

  


  I can combine with ffmpeg to make a .webm file following the instruction here :
https://www.unscreen.com/api under "Convert unpacked Pro Bundle to WEBM video with transparency"

  


  I have a newer mac and should be able to use HVEC_videotoolbox from either these 2 videos or the .webm file created.

  


  The closest I found was this which seems to generate a corrupt video that cannot be viewed in safari. Use FFmpeg to generate a movie with alpha channel from separate video and fill movies ? but

  


• FFMPEG Layering two .mov files color issue

  21 février 2023, par JDC

  I have two folders containing numbered .mov files all the same length, one folder for front and one for back. I'm using ffmpeg to combine the front and back videos with matching numbers into one output video (the front video has an alpha channel). The below command works, but in the output video the front layer has slightly incorrect colors compared to the input (reds are too yellow for example). The back layer in the output looks correct. Both input files use the bt709 color space (checked with ffprobe). Is there something in the overlay options which is causing the front layer to look incorrect, or something I'm doing wrong with the colorspace options ?

  


  


  for f in Video_Back/Video_Back_*.mov ; do
num=$(echo "$f" | sed -n 's/.*Video_Back_([0-9]5).mov$/\1/p')
if [ -f "Video_Front/Video_Front_$num.mov" ] ; then
ffmpeg -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "$f" -color_primaries bt709 -color_trc gamma28 -colorspace bt709 -i "Video_Front/Video_Front_$num.mov" -filter_complex "[1:v]format=rgba[fg] ;[0:v][fg]overlay=shortest=1:alpha=straight,eq=gamma=1.0[mixed]" -map "[mixed]" -map 0:a:0 -c:v libx264 -crf 18 -preset veryfast -c:a copy "Video_Merged/Video_Merged_$num.mp4"
fi
done