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{ stdenv, fetchurl, writeScriptBin, ffmpeg_2, libpulseaudio }:
# FIXME: Clean up this whole file!
with stdenv.lib;
let
streams = {
dnyarri = {
width = 1920;
height = 1080;
monitor = 1;
};
mmrnmhrm = {
width = 1600;
height = 1280;
monitor = 1;
};
};
sumAttr = name: attrs: acc: acc + (getAttr name attrs);
maxAttr = name: attrs: acc: let
current = getAttr name attrs;
in if acc > current then acc else current;
fullwidth = fold (sumAttr "width") 0 (attrValues streams);
maxheight = fold (maxAttr "height") 0 (attrValues streams);
resolution = "1920x1080";
fps = 15;
quality = "slow";
encoder = let
aacenc = stdenv.mkDerivation rec {
name = "vo-aacenc-0.1.3";
src = fetchurl {
url = "mirror://sourceforge/opencore-amr/${name}.tar.gz";
sha256 = "0dhghm3c8pqrriwwyj5x9i0yf52fmdfijbgqqkvqvwarldvp86p5";
};
};
base = ffmpeg_2.override { x11grabSupport = true; };
in stdenv.lib.overrideDerivation base (attrs: {
configureFlags = attrs.configureFlags ++ [
"--enable-libpulse"
"--enable-version3"
"--enable-libvo-aacenc"
];
preConfigure = ''
addPkgConfigPath "${libpulseaudio}"
addPkgConfigPath "${aacenc}"
'';
NIX_CFLAGS_COMPILE = "-I${aacenc}/include -L${aacenc}/lib";
buildInputs = attrs.buildInputs ++ [ libpulseaudio aacenc ];
});
script = let
combine = [
"color=c=black:s=1248x640 [surface]"
"[0:v] setpts=PTS-STARTPTS, scale=680x540 [left]"
"[1:v] setpts=PTS-STARTPTS, scale=568x640 [right]"
"[surface][left] overlay=0:0 [leftonly]"
"[leftonly][right] overlay=680:0 [out]"
];
/*
combine = [
"color=c=black:s=${toString fullwidth}x${toString maxheight} [surface]"
"[surface][0:v] overlay=0:0 [leftonly]"
"[leftonly][1:v] overlay=${toString streams.dnyarri.width}:0 [out]"
];
*/
nop = x: "\\";
in ''
#!${stdenv.shell}
keyfile="$HOME/.twitch.key"
if [ ! -e "$keyfile" ]; then
echo "You need to put your streaming key into $keyfile!" >&2
echo "To obtain the key, please visit the following URL:" >&2
echo "http://www.twitch.tv/broadcast/dashboard/streamkey" >&2
exit 1
fi
${encoder}/bin/ffmpeg -loglevel warning \
-f x11grab -s "${resolution}" -r "${toString fps}" -i "$DISPLAY+1920,0" \
-f pulse -ac 2 -i default \
-codec:v libx264 -s 1280x720 -preset:v fast -crf 24 -pix_fmt yuv420p \
-codec:a libvo_aacenc -ar 44100 -threads auto -b:a 128k -bufsize 8k \
-f flv "rtmp://live-fra.twitch.tv/app/$(< "$keyfile")" "$@"
'';
disabled = ''
${encoder}/bin/ffmpeg \
-f x11grab -s "${resolution}" -r "${toString fps}" -i "$DISPLAY+1920,0" \
${nop ''
-i 'tcp://dnyarri:7891?listen' \
''}
-f pulse -ac 2 -i default \
${nop ''
-filter_complex "${concatStringsSep "; " combine}" \
-map "[out]" -map 2:a,0:v \
-c:v libx264 -preset "${quality}" -s 1280x720 \
-b 2500k -minrate 2500k -maxrate 2500k \
-tune film -qscale:v 1 -threads:v 4 -crf 1 -tune animation \
-c:a libmp3lame -ar 44100 -qscale:a 1 -bufsize 512k -threads 4 \
-framerate "${toString fps}" \
-force_key_frames 2 -b 2500k -minrate 2500k -maxrate 2500k \
-g 2 -keyint_min 2 \
''}
-c:v libx264 -preset fast -pix_fmt yuv420p -s 1280x800 -threads 0 \
-c:a libmp3lame -ab 128k -ar 44100 -threads 0 \
-f flv "rtmp://live-fra.twitch.tv/app/$(< "$keyfile")" "$@"
'';
in writeScriptBin "twitchstream" script
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