: You might notice they look "blocky" or pixelated because they were designed for old standard-definition (SD) screens. How to Fix Out-of-Sync Subtitles
Matching subtitles to a specific version is necessary because different releases (DVD, Blu-ray, Streaming) often have slight variations that throw timing off: subtitle SyncOriginal DVD Version
Mastering Subtitle Synchronization: A Comprehensive Guide - Speechify : You might notice they look "blocky" or
: Original DVD subtitles are actually transparent bitmap images (VobSub or IDX/SUB) rather than plain text. subtitle SyncOriginal DVD Version