chore: update version to 7.0.0-beta.12 and document changes

Author: kadirsaglam41

CHANGELOG

@@ -1,3 +1,10 @@
+7.0.0-beta.12 2025-04-14
+Breaking Changes:
+* Dropped support for FFmpeg versions prior to 6.0. Users must update to FFmpeg 6.0 or higher to ensure proper functionality.
+
+Fixes:
+* Updated FFmpeg transcoding pipeline to include `setsar=1` for consistent sample aspect ratio (SAR) to avoid DASH packaging errors.
+
 == 7.0.0-beta.11 2025-04-10
 
 Improvements:

README.md

@@ -13,7 +13,7 @@ Only guaranteed to work with Ruby 3.1 or later.
 
 ### ffmpeg
 
-The current gem is tested against ffmpeg 4, 5, 6 and 7. So no guarantees with earlier (or much later) 
+The current gem is tested against ffmpeg 6 and 7. So no guarantees with earlier (or much later) 
 versions. Output and input standards have inconveniently changed rather a lot between versions 
 of ffmpeg. Our goal is to keep this library in sync with new versions of ffmpeg as they come along.
 

lib/ffmpeg/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module FFMPEG
-  VERSION = '7.0.0-beta.11'
+  VERSION = '7.0.0-beta.12'
 end