DeX: Black screen on Android 15 with both Hardware and Software encoders

[Mohammed657858]

Device

• Device: Samsung Galaxy S23 Ultra (SM-S918B)
• OS: Android 15
• scrcpy version: 3.3.1

Problem
When using scrcpy --new-display to launch Samsung DeX, the window opens with the DeX taskbar visible at the bottom, but the rest of the screen is black.

Normal screen mirroring (running scrcpy with no arguments) works perfectly.

This issue seems to be a video encoding problem for virtual displays specifically on Android 15.

Troubleshooting Steps Taken:

• The default hardware encoder (c2.qti.avc.encoder) results in a black screen.
• Forcing the software encoder (--video-encoder=c2.android.avc.encoder) also results in a black screen.
• Verbose log shows no errors during the process.
• All drivers (PC) and software (phone, scrcpy) are up to date.

[rom1v]

Did you try starting an app? https://github.com/Genymobile/scrcpy/blob/master/doc/virtual_display.md#start-app