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add screenrec: screen + audio capture

simplified version of w520rec, params suitable for x250

--- /dev/null

+++ b/bin/screenrec

@@ -1,0 +1,13 @@

+#!/bin/rc

+# ffmpeg -i rec.264 -i rec.flac -c:v copy vid.mp4

+# http://runjimmyrunrunyoufuckerrun.com/src/freqgraph.c

+# http://shithub.us/sigrid/hj264/HEAD/info.html

+rfork e

+

+if(test -f /dev/audioinU*)

+	u=/dev/audioinU*

+if not

+	u=/dev/audio

+t=`{date -t}

+window -m rc -c 'dd -if $u -bs 1764x2 | freqgraph | audio/flacenc > rec.^$t^.flac'

+video/hj264 -f 30 -k 1500 -Q 50 /dev/screen > rec.^$t^.264

-- 

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