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We currently scale bitrate based on both remote vs local, SDR vs HDR, and H.264 vs HEVC vs AV1. This has led to a lot of user confusion wondering why the bitrate doesn't seem to match their selection in some configurations. In H.264 local streams, we will currently overshoot the selected bitrate by about 20% due to FEC, while remote streams will be right around the selected bitrate due to remote-specific FEC bitrate adjustments. HEVC and AV1 streams (as configured by most clients) basically behave similarly between local and remote, since the codec bitrate adjustment factor of 75% is nearly the same as the FEC bitrate adjustment factor of 80%. However, this adjustment was only performed for SDR streams so local HDR streams would overshoot like H.264. This change cleans up all this mess by using a single non-codec-specific video bitrate adjustment for FEC in all cases. It also allows Sunshine to perform the FEC adjustment on its end if the default FEC value of 20% has been overridden by the user or if we implement dynamic FEC support in the future. The net result is HEVC and AV1 SDR streams will only see a tiny bitrate increase, but HDR and H.264 may see noticable 20% bitrate reductions that may require the user to adjust their bitrate setting to reach the effective value they got before. However, the new behavior should be more intuitive for users going forward since changing codecs, using a VPN, or enabling HDR won't cause significant changes to the video bitrate.
Moonlight Streaming Core Library
Moonlight-common-c contains the core GameStream client code shared between Moonlight clients, including Moonlight PC, Moonlight Android, Moonlight iOS, and Moonlight Chrome.
If you are implementing your own Moonlight game streaming client that can use a C library, you probably want the code here.
Note to Developers
Moonlight-common-c requires the specific version of ENet that is bundled as a submodule. This version has changes required for IPv6 compatibility and retransmission reliability, among other things. These are breaking API/ABI changes which make Moonlight-common-c incompatible with other versions of the ENet library. Attempting to runtime link to another libenet library will cause your client to crash when connecting to recent versions of GeForce Experience.