H264 at 120fps causes massive lag streaming to LG TV

[andy013]

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Hey, I recently started using Sunshine in place of GameStream. Sunshine (v2024.1115.143556) is running on my windows pc with a GTX 970 and a 240hz monitor. It's streaming to an LG TV running the Moonlight app https://github.com/mariotaku/moonlight-tv.

Everything is working fine apart from h264 120fps. When I try this I start getting massive amounts of lag, multiple seconds of delay which makes it impossible to use. Even using menus in games is difficult because of how bad the lag is. It seems like the stream is falling further and further behind as time goes on. This is not an input issue as my controller is connected directly to the PC.

h264 at 60fps or 90fps works fine with minimal latency. h265 at 120fps also works fine.

All settings in Sunshine are left at defaults. The UI in Moonlight does not show any massive increase in latency for encoding or decoding.

It's not a big deal as I will probably use h265 anyway but I couldn't figure out any way to resolve this issue.

[EDIT] I tested on my phone and it seems to work fine with h264 at 120fps so it's possible this is an issue with the webOS moonlight client. It was working fine with GameStream though, before I swapped to Sunshine.