chore: tweak encoding version documentation format

docs/encoding_versions.md

@@ -1,8 +1,10 @@
-# Encoding Settings Version 1.0
+# Encoding Settings Changelog
 
-This document describes the encoding settings used by videnc version 1.0 for all video encodings.
+This document tracks changes to the encoding settings used by videnc over time.
 
-## Universal Settings
+## Version 1.0 - Initial Release (2025-10-04)
+
+### Universal Settings
 
 These settings are applied to all videos regardless of source material:
 
@@ -17,15 +19,15 @@ These settings are applied to all videos regardless of source material:
 - **film-grain-denoise**: 1 (enabled for all encodings)
 - **tune**: 0 (default tuning)
 
-## Variable Settings
+### Variable Settings
 
 These settings vary based on video characteristics:
 
-### Resolution-Based Settings
+#### Resolution-Based Settings
 - **CRF**: 30 for videos < 1 MPixel, 28 for videos >= 1 MPixel
 - **film-grain**: 10 for videos < 1 MPixel, 5 for videos >= 1 MPixel
 
-## Source Material Dependent Settings
+### Source Material Dependent Settings
 
 These settings are conditionally applied based on the characteristics of the source video:
 
@@ -38,20 +40,20 @@ These settings are conditionally applied based on the characteristics of the sou
 - **Keyframe Interval**: Dynamically calculated based on video FPS
   - Value: `Math.round(videoInfo.fps * 5)`
 
-## Audio Settings
+### Audio Settings
 
 - **Audio Codec**: libopus for all audio streams
 - **Channel Layout**: Preserved from source (with special handling for sideloaded audio)
 - **Language Metadata**: Preserved for each stream
 - **Disposition**: English audio tracks set as default
 
-## Subtitle Settings
+### Subtitle Settings
 
 - **Subtitle Handling**: Copy (no re-encoding)
 - **Language Metadata**: Preserved for each stream
 - **Disposition**: Finnish subtitle tracks set as default
 
-## Metadata Handling
+### Metadata Handling
 
 - **Metadata Stripping**: Original metadata is stripped (`-map_metadata -1`)
 - **Custom Metadata**: Added from OMDB API or user input