2019-12-11, 06:03
With the "timestamp" build, I got the values mentioned below. The measurements were taken with a Sync-One2 (https://sync-one2.harkwood.co.uk/) with FireTV Stick 4K connected directly to LG OLED C8. Audio passthrough was disabled in Kodi. The test file is from Spears & Munsil UHD HDR Benchmark disc. It is a 4K 23.976fps HDR10 test pattern. The internal timing resolution of the Sync-One2 is 0.05ms. The display is rounded to nearest ms.
FireTV 4K
Dolby Digital: -176ms
AAC: -291ms
Dolby TrueHD: -284ms
DTS-HD MA: -256ms
For comparison, these are the values from nVIDIA Shield TV Pro (2019)
Dolby Digital: -134ms
AAC: -124ms
Dolby TrueHD: -127ms
DTS-HD MA: -138ms
FireTV 4K
Dolby Digital: -176ms
AAC: -291ms
Dolby TrueHD: -284ms
DTS-HD MA: -256ms
For comparison, these are the values from nVIDIA Shield TV Pro (2019)
Dolby Digital: -134ms
AAC: -124ms
Dolby TrueHD: -127ms
DTS-HD MA: -138ms