# Odd Assign Track Number Behavior
**URL:** https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943
**Category:** Mac
**Created:** [December 23, 2024, 8:05pm UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943 "2024-12-23T20:05:21Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Whitburn\_Collector](https://community.mp3tag.de/u/Whitburn_Collector)
#### Post date: [December 23, 2024, 8:05pm UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943/1 "2024-12-23T20:05:21Z")
This happened will tagging track numbers on mp4 files using the Mac edition of MP3Tag.
Some track numbers are padded with an extra 0 (desired) anothers do not have the zero padding, see video clip that captured the behavior
Rob
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### Author:  [@MotleyG](https://community.mp3tag.de/u/MotleyG)
#### Post date: [December 23, 2024, 8:08pm UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943/2 "2024-12-23T20:08:23Z")
Are all of these mp4? Usually any m4v/mp4 will not get leading zeros.
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### Author:  [@Whitburn\_Collector](https://community.mp3tag.de/u/Whitburn_Collector)
#### Post date: [December 23, 2024, 8:12pm UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943/3 "2024-12-23T20:12:17Z")
Forgot to mention, these are MP4 files. I'm not sure why MP4 files would be processed differently than MP3 unless metadata specification for the track field is different between the two file types. This certainly doesn't explain why some files were tagged in a different track number format.
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### Author:  [@MotleyG](https://community.mp3tag.de/u/MotleyG)
#### Post date: [December 23, 2024, 8:13pm UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943/4 "2024-12-23T20:13:45Z")
m4v and m4a metadata for the track number is expected to be an integer, and as such leading zeros are dropped. The mp3 format is using a string to store the information and can have leading zeros as well as the "/" total discs even.
But it is more odd if all of those files are the same format and yield different results.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [January 27, 2025, 6:42am UTC](https://community.mp3tag.de/t/odd-assign-track-number-behavior/66943/5 "2025-01-27T06:42:43Z")
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