Does 'copy' with mp4 muxer degrade image quality?

[BG Davis]

Hello,

I want to make multiple copies of an mp4 video, each one with a different sound track.
Using Avidemux, if I set Video Output to 'Copy' each time, will the quality of the video frames remain unchanged, or will it degrade slightly with each 'copy' operation?

Thanks!

[eumagga0x2a]

While the very first stream copy generation may result in so called early (or leading) B-frames not used as reference for later frames being dropped, the content of all other frames should remain unchanged no matter how many generations. Absolutely.