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The issue is widespread across Premiere Pro versions (CS3 to 2021) and sometimes appears after Windows updates or reinstalls, suggesting a dependency on system-level codecs (like Windows Media Feature Pack) or GPU acceleration issues. 2. Root Causes
Why is my exported video file so much larger than the original?
Here is a full report on the issue, causes, and solutions based on community-sourced troubleshooting. 1. Issue Overview