audio_resource

test result

• ffmpeg -i $file ${file}.mp3

fileName	size(byte)	time(ms)	size/time(kb/s)	remark
01.amr	289,830	1,541.8	187.98	amr-slowest
02.wav	191,920	193.7	990.81	wav-fatest
03.wav	88,244	62.6	1,409.65	wav-fatest
04.flac	6,209,355	4,738.2	1,310.49	flac-fast
05.m4r	2,410,918	4,314.7	558.77	m4r-slow
06.mmf	240,732	422.4	569.91	mmf-slow
07.amr	2,134	36.5	58.47	amr-slowest
08.amr	96,038	500.7	191.81	amr-slowest
09.ape	5,921,008	5,149.4	1,149.84	ape-fast
10.aac	2,399,808	4,278.1	560.95	aac-slow
11.wma	4,138,144	3,968.8	1,042.67	wma-undefined
12.wv	6,676,995	4,669.7	1,429.86	wv-fast
13.wav	434,218	241.2	1,800.24	wav-fatest
14.mp3	826,766	2,295.0	360.25	mp3-slow
15.mp3	15,926	21.8	730.55	mp3-slow
16.mp2	2,401,175	4,492.7	534.46	mp2-slow
17.wav	10,584,844	4,717.8	2,243.60	wav-fatest
18.mp3	2,402,264	4,840.7	496.26	mp3-slow
19.ogg	1,327,177	4,416.1	300.53	ogg-slow
20.wav	2,490,044	1,140.7	2,182.91	wav-fatest
21.wma	927,365	7,298.9	127.06	wma-undefined

• ffmpeg -i $file -q:a 6 ${file}.mp3 can reduce 50% time