# Long time to convert filename to title
**URL:** https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495
**Category:** Support
**Created:** [June 25, 2026, 9:58pm UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495 "2026-06-25T21:58:22Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@mkrumel](https://community.mp3tag.de/u/mkrumel)
#### Post date: [June 25, 2026, 9:58pm UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/1 "2026-06-25T21:58:22Z")
Just donated and i have a question. Cool program btw.
I make the title of an MP4 mirror the filename. All the other file renamers cant do this without a script it seems. Manually i can edit a file by copy/paste in about 20 seconds. Thankfully mp3tag has automated this process and I am grateful. However, when doing a batch of files, each file can take up to 2 1/2 minutes PER FILE. Some are faster than others, but they are all basically the same file type.
Why does it take so long?
thanks,
Mike
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [June 26, 2026, 6:00am UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/2 "2026-06-26T06:00:00Z")
You do not tell us anything about the file size, the environment, the defender settings.
Files may have to be rewritten if the padding for tag data is not large enough.
And rewriting a file then depends a lot on the speed of the file access.
Local files can be accessed quicker than files on external storages or on network locations.
Also, the defender might interfere, see here:
> [@Windows Defender - Speed of loading files in MP3Tag](https://community.mp3tag.de/t/windows-defender-speed-of-loading-files-in-mp3tag/47784):
>
> In the past I already noticed that the antivirus-software of windows-defender slows down the loading speed of files in MP3Tag dramatically: At this time my third-party antivirus-software (Avast) had been gotten accidently deactivated and windows-defender activated. This time I wanted to give windows-defender a second chance, deinstalled Avast and activated the defender. The same happened as before: Mp3Tag became very slow in loading files in spite of the activated library-function. I tested…
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### Author:  [@mkrumel](https://community.mp3tag.de/u/mkrumel)
#### Post date: [June 26, 2026, 11:07am UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/3 "2026-06-26T11:07:48Z")
My apologies. I am running windows 11. The files are practically the same size for each batch. It doesn't seem to matter. A batch could be 5 to 200 files. An example would be 195,000 in size. I multi select the files in file manager, right click a file and select mp3tag. They all load immediately. Then ctl-a to mult select and convert-filename to %title%. Then that's where it get unpredictable. 1 of 50 may take 8-10 seconds then 2 of 50 might take 30 seconds. They have all just been run through handbrake so they are the same type.
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 26, 2026, 11:19am UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/4 "2026-06-26T11:19:28Z")
Where are these files stored?
Locally on a fast SSD? Externally on USB-HDD? On a network attached storage? In the cloud?
MP4 files (Movies?) can be quite large.
If they have to be rewritten due to the lack of existing padding space, the worst that can happen is that they have to be written entirely from scratch. The time taken for these files may be longer than expected, depending on the source.
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### Author:  [@MotleyG](https://community.mp3tag.de/u/MotleyG)
#### Post date: [June 26, 2026, 11:46am UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/5 "2026-06-26T11:46:30Z")
> [@mkrumel](#):
>
> They have all just been run through **handbrake**
These must be movie files if converted by Handbrake. If there were no tags written then it is very likely that, as @LyricsLover suggested, the padding for metadata is too small and the whole file is rewritten. The time taken to rewrite would be about the same as copying each file.
Note that future edits would be faster since mp3tag does leave some buffer room. Burning that's exceeded again then another rewrite would be necessary to add more space.
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### Author:  [@mkrumel](https://community.mp3tag.de/u/mkrumel)
#### Post date: [June 26, 2026, 12:14pm UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/6 "2026-06-26T12:14:33Z")
They are tv shows and are stored locally on a portable HD. There is usually already information in the title field but it includes the name and all the release information. The string is very long and convoluted. The fastest way for me to do one file is copy the filename, start vlc, go to media information, paste in the title, Click save, and its done. Maybe takes 10 seconds. Waiting is better than doing that for 50 files. It just seemed like it should be faster than that by software.
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 26, 2026, 12:51pm UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/7 "2026-06-26T12:51:41Z")
If you want to know the reason in detail, you will need to compare an MP4 file BEFORE and after using a specialized tool such as [AtomicParsley](https://github.com/wez/atomicparsley).
You could copy this file and make the change once in VLC and once in Mp3tag. Then, compare the newly tagged files with AtomicParsley again.
You can see exactly how VLC and Mp3tag differ in what they write to the MP4 file.
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [June 26, 2026, 12:58pm UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/8 "2026-06-26T12:58:46Z")
You could also try to define an exception for for MP3tag in the defender - as is suggested in the linked thread.
If it works OK for you for some files and for some it does not, then it is doubtful that it is an MP3tag problem but more likely something in your local environment.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 7, 2026, 7:49am UTC](https://community.mp3tag.de/t/long-time-to-convert-filename-to-title/71495/9 "2026-07-07T07:49:59Z")
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