Audio stream bitrate is 0 for some audio tracks

[siewers]

It looks like DTS-X and Dolby TrueHD tracks sometimes don't have the bit rate property set in the JSON output from ffprobe. However, I can see the bit rate is provided as a tag named BPS and BPS-eng, but these tags are not available as part of the IAudioStream interface.

Would it be possible to expose all the tags from each stream as a dictionary?
Alternatively, try find the bit rate from the tags and use that value in case the properties doesn't contain it.