Avoid keeping cryptic names. Use a standard convention:
[Project]_[Date]_[StartTime]_[Duration]_[SubtitleFlag].mp4
Example:
cawd764_20250320_025654_end_engsub_hardcoded.mp4
Before any conversion or cutting, you must inspect the source file. Use a tool like MediaInfo (free, cross‑platform) or ffprobe (part of FFmpeg) to check: