Description of the issue

(field) (value) is already used by another (item)

References

ISO IEC 14496-12 (MPEG-4 ISO base media file format):
track_ID: "Track IDs are never re‐used and cannot be zero."

Possible solution/action

ISO IEC 14496-12:
Fix the encoder to correctly fill track_ID, then remux the content.

Severity

Error