I would like to edit in 4k, but I get these lines on the video.

[theocincotta]

Hello! I get lines on the video and it looks really bad when I edit 4k, my guess is it is user error, here are my settings. I'm importing videos and adding fades between the clips and audio. Any help or suggestions greatly appropriated!
Cheers!
Theo

quality settings

compression = "slow"
videoquality = "24"
vcodec = "libx264"

remove audio and add fade in/out

newclip = VideoFileClip(file, audio=False)
newclip = newclip.fx(vfx.fadein, 1).fx(vfx.fadeout, 1)

then write file.

final_clip.write_videofile(finalname, threads=6, fps=24,
codec=vcodec,
preset=compression,
ffmpeg_params=["-crf",videoquality])

Here are the videos I am making if you are interested.
https://www.youtube.com/@theobikessf

[theocincotta]

I think my issue is I have 4k and other quality clips. I did a test to show was I see and it worked. I'm going to try and remove my opening and just use moviepy. I'll keep you posted. If you have any other suggestions for better quality, that would be appreciated. Thanks!

[theocincotta]

This works as long as all the videos I am working with were created with the same settings. Here is an example of 4k video moving to 5k. You can see where the video gets wacky at 19:00. I have a work around, I just need to create my opening/ending with moviepy. Thanks!
https://youtu.be/LomL05qe5Uc?t=1136