Raspberry Pi Transcoding Question

I have been using Subsonic for a long time and have come to realize it is the only reason why I keep my old desktop PC on all the time. To save some energy, I figured I would try to install Subsonic on an old Raspberry Pi I had that was not really using for anything else. This is the original Pi (Model B with 512MB of Ram). I got Subsonic up and running with little issue. It is playing all MP3 files just fine, but FLAC files are not playing. My guess is the Pi is just not powerful enough to do the transcoding, but was wondering if anyone has had success with this. I am thinking it may be worth upgrading to a newer Pi (or something similar) if others have had success.
Thanks for the input!
EDIT - I still have the question above but I looked at the logs more closely and think there may be a problem with the transcoder configuration. I name my files as "(#) Name.flac" and the log says:
Syntax error: "(" unexpected
I have the recommended configuration setup (ffmpeg -i %s -map 0:0 -b:a %bk -v 0 -f mp3 -)... I think the %s is causing the problem because of the ( in my filename. I am going to look into this, but if anyone has a suggestion it would be appreciated!
Thanks for the input!
EDIT - I still have the question above but I looked at the logs more closely and think there may be a problem with the transcoder configuration. I name my files as "(#) Name.flac" and the log says:
Syntax error: "(" unexpected
I have the recommended configuration setup (ffmpeg -i %s -map 0:0 -b:a %bk -v 0 -f mp3 -)... I think the %s is causing the problem because of the ( in my filename. I am going to look into this, but if anyone has a suggestion it would be appreciated!