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d920cf87a6
Language codes in the `mdhd` box are stored as three 5-bit values, each representing a letter ('a' to 'z') using an offset of `0x60`. If the decoded characters are not in this range, the language should be treated as undefined.
PiperOrigin-RevId: 738470544
(cherry picked from commit 2a4cbc3be47b54a59aef384b288ea802e34fb2f0)