fix: Add support for m4v

[mauricefisher64]

Changes in this pull request

Add m4v and its mimetype to list of support BMFF format

Checklist

• This PR represents a single feature, fix, or change.
• All applicable changes have been documented.
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.28%. Comparing base (2780cf1) to head (8120c5b).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1254      +/-   ##
==========================================
- Coverage   79.36%   79.28%   -0.09%     
==========================================
  Files         149      149              
  Lines       41663    41663              
==========================================
- Hits        33067    33033      -34     
- Misses       8596     8630      +34     

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