The stars are only shown if there are local collection songs in the playlist, if the playlist is empty they are not shown.
If this is not the issue then show a screenshot of what you mean.
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RE: Ratings column blank on new playlist
RE: Song Fingerprinting and Tracking
When directories are scanned and metadata is read, it calculates a unique fingerprint for the song (a sort of hash) which is unique to a specific audio stream. This fingerprint is added to strawberry's database. If songs are renamed or moved on disk, the song is marked in the database as "unavailable", so if the song appears under a different path or filename, it can be matched to the database, this prevents losing things like songs in playlists (since collection songs in a playlist is linked to the entry in the collection database), playcounts and ratings for the song when it's stored in the database.
It takes a lot longer to scan the collection if this feature is on, so that's why it's not on by default.
RE: Song Fingerprinting and Tracking
You can't move songs from one collection directory to another, but you can move from any place within the same collection directory.
Also, make sure to check the "song fingerprinting and tracking" in the collection settings, and apply the setting before you add a collection directory, otherwise do a full re-scan to make sure fingerprints are calculated.
RE: Playback issue - restarting after 10ish seconds
Start Strawberry from a terminal with:
RE: Audio output at 44.1k despite Hi-Res input file/stream - a bug or not implemented Hi-Res support?
Make sure the equalizer, bs2b and replay gain is off in the backend settings, they cause resampling.
Other than that I think the limitation is the driver.
At least on the DACs I've tested you have to set a fixed sample rate and bit depth in the driver settings. For example here are settings for Mcintosh:
Test with VLC, does it output at the same rate?
I've tested exclusive mode, it crashes with some DACs but works with others. I think it's buggy in gstreamer.
RE: New directories are not added
I ran into an issue on my work computer where I use an external HDD mounted through udisks2, the watcher isn't working at all. If I manually mount the disk with mount it works fine. Maybe this is the same issue.
How did you mount the disk? Through udisks2 (removable disk), or through mount / fstabs?
RE: crash on cancelling from "search from album covers"
OK can you start strawberry with gdb and do a backtrace and paste it here if you manage to reproduce the crash again. (Unless it's an abort because of insistent database but then you usually see that on the terminal).
RE: glibc issue on trying to build from git
The glibc in snap is not compatible with the glibc on the native system. So you probably won't get that to work at all.
So either install protobuf-compiler (via apt), or compile protobuf from source.
RE: Copy to ssd on phone
It's not hard-coded, just not specified anywhere so it uses the default storage on the phone. I think this was a restriction in the llibrary used in strawberry (libmtp), and not strawberry itself. But it might be possible in newer versions of libmtp. Unfortunately I have to many things to do so I'm not sure when this can be looked into again.
RE: Love button is greyed out and unresponsive
I don't think there is such a thing as a "Love" tag. "Love" is a audio scrobbler / last.fm thing, the setting to turn on the button is under the scrobbler settings for that reason.
When you press the Love button a request is sent to Last.fm or any of the other scrobbler services depending on which is enabled to "Love" the track, the actual data is only saved on scrobbler service itself, not in strawberry's database.