Bitrate of stems.mp4 are represented incorrect in MIXXX 2.6 beta

Bug Description

The original MP3 file has a bitrate of 320 Kbps

After generating the stems files (using diffrent tools) and assembling the WAV files using the NI STEMS CREATOR

The stems.mp4 file has 1278 Kbps

Since the NI Stems creator include apart from the 4 stems files also the original master file

It has 5 files in total => 1278 / 5 files = 256 Kbps rounded

While it should be 1278 / 4 = 320 Kbps rounded

So depending on whether the mp4 container is 4 or 5 files. Mixxx should calculate accordingly to get the correct BitRate represented

Version

2.6.0 beta

OS

Windows 10 and 11