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这个有很多原因,其中一个就是mic功能没有打开,需要在arecord之前打开mic,例如v853 的操作:
root@(none):/# amixer cset name='MIC1 Switch' on root@(none):/# arecord -D hw:0,0 -f S16_LE -r 16000 -c 1 -d 30 /tmp/test.wav
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