Raise quality and apply global dithering and HDR tone mapping

README.md

@@ -54,9 +54,11 @@ the `.env.example` values through Coolify's environment-variable UI.
 
 ## Codec policy
 
-Cached video is H.264 High Profile, Level 4.1, 8-bit `yuv420p`, CRF 20, capped
-at 12 Mbps. Existing audio, subtitles, chapters, and Matroska attachments are
-preserved when the container supports them.
+Cached video is H.264 High Profile, Level 4.1, 8-bit `yuv420p`, CRF 18, capped
+at 15 Mbps. Existing audio, subtitles, chapters, and Matroska attachments are
+preserved when the container supports them. Ten-bit SDR is converted with
+error-diffusion dithering; HDR10, HLG, and Dolby Vision-labelled sources are
+tone-mapped to BT.709 SDR before encoding.
 
 The fixed source blacklist is:
 
@@ -65,7 +67,9 @@ The fixed source blacklist is:
 - MPEG-2
 - VC-1
 
-Client error reports never modify this list.
+Client error reports never modify this list. Encoding settings form part of
+each cache manifest, so a global quality-policy change automatically invalidates
+and replaces older renditions without touching originals.
 
 ## Cache resizing