MP4 video exporting but file type doesn't match.

[maven080808]

Describe the bug
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2. Click on '....'
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4. See error

Expected behavior
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System Details

• OpenShot Version: 3.3.0
• libopenshot Version: 0.4.0
• Platform: Windows-10-10.0.22621
• Processor: Intel64 Family 6 Model 140 Stepping 1, GenuineIntel
• Machine: AMD64
• Python version: 3.8.9
• Qt5 version: 5.15.2
• PyQt5 version: 5.15.4
• Qt Detected Languages: ['en-US']
• LANG Environment Variable:
• LOCALE Environment Variable:
• Daily Build: Skipped this step

Log Files

• openshot-qt.log (18 KB)
• libopenshot.log: File too small or empty (not uploaded)

Exception / Stacktrace
No stacktrace found in log files

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[Colorjet3]

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