Most cinematic assets are distributed at a Constant Frame Rate of or 24 fps . If the video track has been ripped or transcoded using variable frame rates (where the frame rate drops during stagnant scenes to save file space), subtitle files mapped to absolute time markers will gradually drift out of sync. By the time the movie reaches the 2-hour mark ( 01:58:56 ), the dialogue and text can be off by several seconds. 2. Corrupt Container Timestamps (PTS/DTS Mismatch)
Files marked with "fixed" tags often undergo frame rate changes that can accidentally separate the audio track from the video track. midv912engsub convert015856 min fixed
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