If the file bloat is too much from afconvert, you can also move combined mp3 (output.mp3) into Music/iTunes and convert to aac from there (if so, don't need scripts 2 & 3 here), but its a lot slower and may not yield significant improvements. (5) clean up the files used and generated by this command (4) combine the m4a and FFMETADATAFILE into an m4b (2) convert the combined mp3 into an intermediate caff file (1) combine the mp3's into a single mp3 called "output.mp3" This is a joined command that will (you can split it up at the "&"s and run separately if you want): Rm output.mp3 output.m4a FFMETADATAFILE intermediate.caf *.mp3 do echo "file '$PWD/$f'" done) -c copy output.mp3 & \Īfconvert output.mp3 intermediate.caf -d 0 -f caff -soundcheck-generate -v & \Īfconvert intermediate.caf -d aac -f m4af -soundcheck-read -b 256000 -q 127 -s 2 output.m4a -v & \įfmpeg -i output.m4a -i FFMETADATAFILE -map_metadata 1 -codec copy output.m4b & \
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