if [[ $live_host != "$vps_host" ]] && ip n show 10.2.0.1 | grep . &>/dev/null && \
[[ $(dig +timeout=1 +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]]; then
host=127.0.0.1:8000
+ if ! pgrep '^icecast2$' >/dev/null; then
+ sudo systemctl start icecast2
+ fi
else
find_prefix="ssh live.iankelling.org"
fi
stream_res=$primary_res
fi
-# for 1080p, default 256k is poor quality. 500 is ok. 1500 is a bit
-# better, so go with that. Also, that is about 2x what is recommended
-# in https://livekit.io/webrtc/bitrate-guide (our framerate is lower).
+stream_x=${stream_res%x*}
+stream_y=${stream_res#*x}
+
+# leave out our i3 window borders
+stream_res=$(( stream_x - 4 ))x$(( stream_y - 4))
+
+
+# if hardware acceleration exists, use it to save power & cpu.
+if vainfo |& grep -i VAProfileVP9Profile &>/dev/null; then
+ # 1500 seems almost flawless
+ bitrate_1080=1500
+
+ encode_settings=(
+ -c:v vp9_vaapi
+ # these options increase compression based on random internet reference.
+ -bsf:v vp9_raw_reorder,vp9_superframe
+ )
+ # https://trac.ffmpeg.org/wiki/Hardware/VAAPI
+ global_extra_args=(
+ -vaapi_device /dev/dri/renderD128
+ )
+ extra_filter_arg=",format=nv12|vaapi,hwupload"
+else
+ # 1000 is a bit blury, 1500 is pretty clear, 2000 makes scrolling
+ # adjust much faster, 2500 has marginal improvement on that.
+ #
+ # note https://livekit.io/webrtc/bitrate-guide (our framerate is lower)
+ bitrate_1080=2000
+
+ encode_settings=(
+ -vcodec libvpx
+ -quality realtime
+ -error-resilient 1
+ )
+fi
+
+bitrate=$(( ( stream_x * stream_y ) / ( (1920*1080) / bitrate_1080 ) ))
-bitrate=$(( ( ${stream_res/x/*} ) / 1380 ))
# 8 seems fine. be conservative by going a bit higher.
framerate=10
-hide_banner
-nostats
+ ${global_extra_args[@]}
+
# tested for decreasing latency: did not help.
# -probesize 32
# tested for warning "Queue input is backward in time". did not help.
-filter_complex "[0]azmq,volume=precision=fixed: volume=$volume [vol0];
[1]azmq='b=tcp\://127.0.0.1\:5556',volume=precision=fixed: volume=0 [vol1];
[vol0][vol1] amerge=inputs=2;
-[2]zmq='b=tcp\://127.0.0.1\:5557',drawbox=color=0x262626,drawtext=fontsize=90: fontcolor=beige: x=40: y=40: text=''${delay_arg}[out]"
+[2]zmq='b=tcp\://127.0.0.1\:5557',drawbox=color=0x262626,drawtext=fontsize=90: fontcolor=beige: x=40: y=40: text=''${delay_arg}${extra_filter_arg}[out]"
# An online source says to match a 5 second vid delay, we can do an
# audio delay filter: "adelay=5000|5000". However, we already get
-map '[out]'
# video output options
- -vcodec libvpx
-g $keyframe_interval
- -quality realtime
+ ${encode_settings[@]}
-b:v ${bitrate}k
- -threads 2
- -error-resilient 1
+
## audio output options
-c:a libvorbis
sleep 1
fi
-#echo executing: ffmpeg ${opts[@]}
+echo executing: ffmpeg ${opts[@]}
#{ sleep 1; ffp &>/dev/null & }
# ./configure --enable-libzmq --enable-libpulse --enable-libvorbis --enable-gpl --enable-version3
#
+# note: when playing back, text is going to look aliased unless you
+# watch it in a window that is exactly as bit or bigger than the
+# recording: tabbed i3 window shrinks things. or, use: mpv
+# --video-unscaled
+
### end background/development docs ###