no information for opus audio stream average bitrate

[blueclouds8666]

MediaInfo does not show the average bitrate for the audio stream in .opus files, only a file average is shown under General. This is usually not a problem, as that calculated number is accurate for basic opus files, however, when using opus files with an embedded cover art, that calculated average is not correct in regard to the audio itself. (118 kb/s basic opus vs 259 kb/s opus with an embedded cover; both having the same exact, unmodified audio stream)

For Matroska audio files, both file and audio stream average bitrates are calculated (under General and Audio, respectively). But this does not happen with opus files, being the user unable to know the real bitrate of the audio stream itself, in case that file has a cover art embedded. I believe audio bitrate should be calculated for opus as well, as that metric is fundamental for determining the audio quality of the audio track.

This happens with the latest stable release of MediaInfo. Vorbis files might have the same issue but i haven't tested that yet. I'm providing samples for both .mka and .opus in case they are needed.