Not able to save this m4a

[fillobotto]

The file can't be written because the amountToBeWritten calculated is negative:

https://bitbucket.org/ijabz/jaudiotagger/src/90533d4458b8be3690fe35fab65107563140627f/src/org/jaudiotagger/audio/mp4/Mp4TagWriter.java?at=master&fileviewer=file-view-default#Mp4TagWriter.java-634

To reproduce the error just read the file and save it back as it was, without editing metadata.

[IJabz]

The question is, how do you fix it?

[fillobotto]

@ijabz I wish I had a solution to this, but I did some attempts without luck

[IJabz]

Fixed by #71, save mp4 files without requiring tmp files. Have written data to this file so there is same amount, less and more and in all cases now works without error