[FFMPEG] How to merge flac and image to mkv (Wrong Color)

[Anonymous20]

Hello,

i try to merge audio and image to video in ffmpeg,
Problem : the export does not have the same color as the original


Here is a comparison on YouTube

Original : https://www.youtube.com/watch?v=NsSBI9qwFE4
Export ffmpeg : https://www.youtube.com/watch?v=FsxwqTSqpbQ


The Code : ffmpeg -loop 1 -i rose.jpg -i rose.flac -c copy -shortest rose.mkv

I try to solve this problem since 2017

Note : the color are the same in firefox, but not in Google Chrome
Note2: the color stay the same until YouTube convert the video to VP9


Thank you!

[sneaker]

Probably ffmpeg defaults to bt601 colors while HD video is usually assumed bt709.

Try adding:

-vf zscale=m=bt709:d=ordered

Note : the color are the same in firefox, but not in Google Chrome
Note2: the color stay the same until YouTube convert the video to VP9

This is a separate issue. Different browsers, OS, GPU drivers etc. can produce different displays. You cannot influence this. My recommendation is to always upload HD video as bt709 and hope Google et. al. someday figure out how to correctly display everything on all systems.

[jagabo]

Yes, it's a rec.601 vs rec.709 issue. HD video should use the rec.709 matrix to convert between RGB and YUV. Whenever possible flag the video as rec.709 (some codec and containers don't allow for this). Even with properly converted and flagged rec.709 you may not get the proper colors in some players/editors. Some always use rec.601. Some always use rec.709. Some assume rec.601 for low res, rec.709 for high res. Some will look for flags and act accordingly.