ffmpeg video capture usb example

#! /bin/bash
# run as:
#   capture.sh /dev/video0 hw:2,0 output.mkv
# Be sure pulseaudio is dead if this isn't working.
VIDEO_DEVICE="$1"
AUDIO_DEVICE="$2"
OUTPUT_FILE="$3"
v4l2-ctl --device "$VIDEO_DEVICE" --set-fmt-video=width=640,height=480
ffmpeg -f v4l2 -i "$VIDEO_DEVICE" -f alsa -i "$AUDIO_DEVICE" -vcodec libx264 -crf 22 -acodec libfdk_aac -ab 128k "$OUTPUT_FILE"