# How to export mp4 tags

**URL:** <https://community.mp3tag.de/t/how-to-export-mp4-tags/41320>\
**Category:** Support\
**Created:** [April 3, 2018, 6:36pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320 "2018-04-03T18:36:47Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![s\_PLASH](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/848f3c/32.png) [@s\_PLASH](https://community.mp3tag.de/u/s_PLASH)\
**Post date:** [April 3, 2018, 6:36pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/1 "2018-04-03T18:36:47Z")

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I am trying to export a list of file "names", "Legth" and "date modified" for .mp4 files

unfortunately I am not able to figure out propper tag names to build a working string  
something like %filename% %lenght% %date% would work for .mp3 files, but for .mp4 only empty spaces I get

please help!

[![Unbenannt](https://community.mp3tag.de/uploads/default/original/2X/c/c547a6566eea0810547046dba06ff9ccb558a8f9.png)](https://ibb.co/geSwzx)

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**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\
**Post date:** [April 3, 2018, 6:39pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/2 "2018-04-03T18:39:07Z")

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Sorry, I do not understand what you want to export.  
The length of the filename?  
$len(%\_filename%)

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<div class="post-metadata">

**Author:** ![s\_PLASH](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/848f3c/32.png) [@s\_PLASH](https://community.mp3tag.de/u/s_PLASH)\
**Post date:** [April 3, 2018, 6:42pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/3 "2018-04-03T18:42:00Z")

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wow O.O that was a quick response!! I just edited my 1st posting. now my problem should be clear

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**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\
**Post date:** [April 3, 2018, 6:46pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/4 "2018-04-03T18:46:59Z")

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please see the help on variable names for export:

> **[Format Strings and Placeholders – Mp3tag Documentation](https://docs.mp3tag.de/format/#export)**
>
> Documentation on format strings and placeholders to describe the structure of file names and imported data. Mp3tag is the universal Tag Editor.

> [@s\_PLASH](#):
>
> %filename% %lenght% %date%

are no valid variable names.  
%filename% -\> %\_filename%  
%lenght% -\> %\_length%  
%date% -\> %\_file\_mod\_datetime%

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<div class="post-metadata">

**Author:** ![s\_PLASH](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/848f3c/32.png) [@s\_PLASH](https://community.mp3tag.de/u/s_PLASH)\
**Post date:** [April 3, 2018, 6:55pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/5 "2018-04-03T18:55:36Z")

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IT WORKED!!😍🕶  
MANY THANKS!

[![Unbenannt2](https://community.mp3tag.de/uploads/default/original/2X/d/d18e840e4b046df1721f8ffa1a92ccded3b1d56f.png)](https://ibb.co/k3KOCH)

 ![Unbenannt4](https://community.mp3tag.de/uploads/default/original/2X/2/23a4f4cfd8463d354e0172a4161805b5ff29239c.png)

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**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\
**Post date:** [February 9, 2026, 12:27pm UTC](https://community.mp3tag.de/t/how-to-export-mp4-tags/41320/6 "2026-02-09T12:27:21Z")

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