Originally Posted By: Gordon Scott

In either case the new mp3 file is of a different type to the mp4, with different packaging data, so the file has been converted.

Thank you Gordon.
Here is further evidence that corroborates this from an FFmpeg perspective.

This should now be established truth, settled science and confirmed fact.

Let's all move on. . . whewwww, this took a loooong time.

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FFmpeg.jpg (39.03 KB, 60 downloads)

https://soundcloud.com/user-646279677
BiaB 2025 Windows
For me there’s no better place in the band than to have one leg in the harmony world and the other in the percussive. Thank you Paul Tutmarc and Leo Fender.