Feature needed: Dynamic video crop

Is your feature request related to a problem? Please describe.
I offen watch phone video and operate phone on my laptop, but when i watch video, the black borders on both sides of the video are too big , because most video is 16:9 ratio, but my phone screen is 19:9 ratio, so when i watch video, i will crop video to 640x360 (16:9), when i operate phone, i will use its original ratio 19:9. I do use AHK script finished this feature automaticly according the phone screen mode (landscape or portrait), it works ok , but not perfectly, becaure there is a 3~4 second interruption during this mode change (because scrcpy can't do a dynamic corp, so ,when changing screen mode ,i have to close scrcpy process and restart it).

Describe the solution you'd like
I think scrcpy can do a crop on PC side, not really crop video, just display the area needed and hide the area not needed.

Describe alternatives you've considered

Additional context

The issue does not name files, tests, or an entry point. Start by locating scrcpy’s PC-side display path and reviewing how it handles landscape and portrait changes. Done means the displayed area can change between the requested crop and the original ratio without restarting scrcpy or causing the reported interruption.