magewell capture

capture.sh

#!/bin/bash

VDEV="/dev/video0"
ADEV="default:CARD=HDMI"
# input: cvbs (composite), yc (s-video), hdmi, component, auto
VINPUT=yc
AINPUT=line_in

# Set input to S-Video and AR to 4:3
mwcap-control --audio-input $AINPUT $VDEV
mwcap-control --video-input $VINPUT $VDEV
mwcap-control --video-input-aspect 4:3 $VDEV

#ffmpeg -re -f alsa -thread_queue_size 1024 -i $ADEV -ac 2 -ar 48000 -f video4linux2 -i $VDEV -c:v libx264 -preset:v ultrafast -crf 15 -c:a flac "$1"

# FFV1 + FLAC will produce a totally lossless capture
ffmpeg -f alsa -thread_queue_size 1024 -i $ADEV -f video4linux2 -i $VDEV -c:v ffv1 -c:a flac -ac 2 -ar 48000 "$1"

thanks, very useful :)