window capture, audio lag fix, reasonable volume, remove mouse cursor

[jayv]

Here are a number of changes I made on my Linux/AMDGPU system to make streaming to a Samsung TV (Airplay compatible) as well as an AppleTV4K+HomePod bearable.

• Removes code that adds a synthetic 0.5s audio delay, which made watching sports/talk unbearable

2026/06/19 13:59:28 [SETUP] raising session latency to receiver playout floor: 500ms
2026/06/19 13:59:30 [AUDIO] audio latency: 22050 samples

• feature: explicit window capture instead of full screen (e.g. use xdotool selectwindow you can get the ID to pass in so you can capture a background window while working on something else)

• sets volume to "20", the existing code maxed out the volume on either my TV or my AppleTV/HomePod almost blowing the speakers on stream launch, that's an extremely careless default choice. 20 was about 30% volume which seems far more reasonable.

• removes the "fake" mouse cursor X11 adds, when broadcasting a background window it's very weird to see the cursor move around when you're working on something else in the foreground