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This app extract audio from quicktime or mp4 videos.
Select a quicktime or mp4 video from Photos app or Files app.
Set extraction time, enter an audio file name,
and choose an audio format.
Then extract.
You can attach an artwork and add an artist name to the extracted audio file when choosing aifc, aiff, flac, m4a, mp3, mp4 or wav format (except caf).
You can directly open this app without saving videos to Photos app
from share menu of other video apps.
You can open with other apps and share the extracted audio.
Extracted audios are available in Files app also:
On My iPhone -> MovieToAudio -> Audio folder
【Supported audio formats】
- aifc
- aiff
- caf
- flac
- m4a (recommended)
- mp3
- mp4
- wav
【About IN APP PURCHASE】
Removing ADs is available via an auto-renewable yearly subscription.
Payment will be charged to iTunes Account at confirmation of purchase.
Subscription automatically renews unless auto-renew is turned off at least 24-hours
before the end of the current period. Manage your subscriptions in Account Settings after purchase.
No cancellation of the current subscription is allowed during active subscription period.
Privacy Policy: https://nobu-y-dev.web.app/export-audio/privacy-policy.html
Terms and Conditions: https://nobu-y-dev.web.app/export-audio/terms-and-conditions.html

If you need other features, have suggestions, just rewrite a review;  
I will do my best!
If extracted files disappears from Files app, restarting the device may fix the issue.
If you cannot extract the audio, restarting the device may fix the error;
if restarting does not solve the error, try moving the video from Photo app to File app,
then open from File app.
if these workaround do not fix the error and you can send me the source video or
a downloadable link from the contact mail, I would do my best to debug.
If you like the app, please review or leave a comment.
Thanks