alsa capture works then stops working

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this works over and over and over perfectly:
arecord -D plughw:1,0 -c 2 -r 48000 | aplay

however, when I do either of:

mplayer device=/dev/video0 ALSA_CARD=1 ALSA_PCM_CARD=0 tv://
or
vlc v4l2:// --v4l2-standard=NTSC --input-slave=alsa://hw:1,0 --v4l2-width=640 --v4l2-height=480 --aspect-ratio=4:3

then
arecord -D plughw:1,0 -c 2 -r 48000 | aplay
stops working.
Additionally, I never heard any sound from the capture device.

here are details for the experience and my system.

https://docs.google.com/document/d/1X9pOl5-Yh9nCkPQdmhCOpyaoCBEvvdND5SDn3lFxMrQ/edit

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