midicmd="abc2midi /Users/jc/w/tmp/Tune-38636-Cotillon_a_huit.abc -v -o /Users/jc/w/tmp/Tune-38636-Cotillon_a_huit.midi >>/Users/jc/w/tmp/Tune-38636-get.log 2>&1" returned status 34304.

Error exit status 34304; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 ]
filesizedescription
Tune-38636-Cotillon_a_huit.abc 65065 ABC music file with the extracted tune(s)
Tune-38636-Cotillon_a_huit.txt 65065 Plain-text file with the extracted tune(s)
Tune-38636-get.log 40436 Log file, useful mostly for debugging
These files should be available for 24 hours.