[FFmpeg-user] How do you use Ffmpeg to give unique title/track names (%02d) using -metadata to a split .mp3 file?

[Dave F]

Hi

I've successfully split a .mp3 file & given it unique names using 
"XX_%02d.mp3" in the following command: (XX_01, XX_02 etc.)

How do I perform similar for the file's title or track? -metadata 
title="YY_%02d" gives the file the literal title name of YY%02d. How can 
I get the -metadata command to accept the numerical coding?

ffmpeg -i "input.mp3" -c copy -segment_time 500 -f segment 
-segment_start_number 1 -metadata title="YY_%02d" -metadata 
track="YY%02d" "XX_%02d.mp3"

Cheers
DaveF