I've been confused by this discussion regarding the Rating metadata
myself. I've done a lot of programming using the excellent exiftool
(https://exiftool.org/) to create useful utilities to manage my picture
file metadata. When I tried to extend into the realm of mp3s I also had
trouble finding where the rating data was. What I discovered was that it
was being stored obtusely under the meta tag "Popularimeter". Here is what
I do to extract the rating value.
First, here is what the raw metadata looks like. The specific content
varies depending upon how it was stored by the program where the rating
assignment was made.
Here is an example from an early file where Windows Media Player made the
assignment:
# exiftool -Popularimeter *.mp3
Popularimeter : Windows Media Player 9 Series Rating=192
Count=0
Here is the content from a file rated with Clementine:
# exiftool -Popularimeter *.mp3
Popularimeter : Rating=192 Count=0
I extract just the rating value in my program using:
POP=$(exiftool -Popularimeter "${FILE}" | perl -pe
's/^.*Rating=([0-9]*).*$/\1/')
Of course there are many ways to get this job done. I'm using ksh and perl
here.
I then convert this to a simple integer, formatted for my output needs:
if [[ -z "${POP}" ]] ; then
RATING=""
elif [[ ${POP} -ge 255 ]] ; then
RATING="Rating : 5"
elif [[ ${POP} -ge 192 ]] ; then
RATING="Rating : 4"
elif [[ ${POP} -ge 128 ]] ; then
RATING="Rating : 3"
elif [[ ${POP} -ge 64 ]] ; then
RATING="Rating : 2"
else
RATING="Rating : 1"
fi
I hope this helps.
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