# ffs = ffmpeg stream
-# todo: figure out how to record mumble
-# todo: get icecast on li.b8.nz
-# todo: https://superuser.com/questions/1106674/how-to-add-blank-lines-above-the-bottom-in-terminal
+# todo: learn to start working in one corner of the screen.
+
+# todo: get an icecast on li.b8.nz for when i'm away from home.
+
+# potential improvement: it might be nice that we could have a tall terminal bug only use
+# the top half for a 1080p stream, this is how:
+# https://superuser.com/questions/1106674/how-to-add-blank-lines-above-the-bottom-in-terminal
+#
+# potential improvement: sometimes I probably want to stream full height
+# window. I could add an option for that.
+
+# potential improvement: setup a function which automatically mutes after some time, or
+# after some time of no audio input.
+
+
+### begin background/development docs ###
+
+# zmq vs stdin commands:
+#
+# * zmq allows targeting a specific filter when there are duplicates.
+#
+# * if you type stdin command too slow, ffmpeg will die because it stops
+# doing normal work while it is waiting.
+#
+# * zmq returns a result to the calling process, rather than printing to
+# stdout.
+#
+# * the only simple zmq tool I found, zmqsend, requires compiling. I
+# used the latest ffmpeg 7.0.1. Build like so:
+#
+# p build-dep ffmpeg/aramo
+# ./configure --enable-libzmq # i already had libzmq3-dev installed
+# make alltools
+# cp tools/zmqsend /a/opt/bin
+#
+# * ffmpeg debug output was useful in testing zmq commands.
+#
+# * Important documentation for stdin commands is only found by typing
+# "c" into the stdin of ffmpeg and reading the output.
+#
+#
+#
+# stdin command docs, before I abandoned it for zmq:
+# mkfifo -m 0600 /tmp/iank-ffmpeg
+# # ffmpeg sits and waits until we do this. dunno why.
+# echo >/tmp/iank-ffmpeg &
+# ffmpeg ... </tmp/iank-ffmpeg |& while read -r line; do : check results; done
+# # example of working commands:
+# echo "cdrawbox -1 t 0" >/tmp/iank-ffmpeg
+# echo "cdrawbox -1 t fill" >/tmp/iank-ffmpeg
+# echo "cdrawtext -1 reinit text=''" >/tmp/iank-ffmpeg
+# echo "cvolume -1 volume=1" >/tmp/iank-ffmpeg
+
+
+# For testing: to show the number of audio channels in a resulting file
+# https://stackoverflow.com/questions/47905083/how-to-check-number-of-channels-in-my-audio-wav-file-using-ffmpeg-command
+#
+# ffprobe -i /tmp/out.wav -show_entries stream=channels -select_streams a:0 -of compact=p=0:nk=1 -v 0
+
+# for a right/left speaker test:
+# https://askubuntu.com/questions/148363/which-linux-command-can-i-use-to-test-my-speakers-for-current-talk-radio-output
+# p install alsa-utils
+# speaker-test -t wav -c 2 -l 1
+
+# There are 2 other options for audio, so I wanted to do a little
+# performance measurement of this method.
+# 1 is to combine the 2 audio sources in pulse,
+# https://unix.stackexchange.com/questions/351764/create-combined-source-in-pulseaudio .
+# 1 is to record mumble and combine in post processing.
+
+### benchmark / perf tests: these are pretty inaccurate.
+# 29 seconds cpu use. video bitrate 1500k, 8 fps, 2x keyframe interval.
+# * 64k vorbis: 69.7%
+# * 128k vorbis: 70.1% (used in subsequent tests)
+# * 1 audio input: 64.3%
+# * 0 audio inputs: 59.2%
+
+# how I did perf testing: add -to 00:00:30 to ffmpeg opts to
+# conveniently exit after measurement. Then run:
+#
+# ffmpeg "${opts[@]}" &
+# pid=$!
+# sleep 29
+# ps -p $pid -o %cpu
+# kill %%
+
+# filter for only 1 audio input:
+#-filter_complex "[0]azmq,volume=precision=fixed;[1]zmq='b=tcp\://127.0.0.1\:5557',drawbox=color=0x262626,drawtext=fontsize=90: fontcolor=beige: x=40: y=40: text=''"
+# filter with 0 audio input:
+# -filter_complex "[0]zmq='b=tcp\://127.0.0.1\:5557',drawbox=color=0x262626,drawtext=fontsize=90: fontcolor=beige: x=40: y=40: text=''"
+
+
+# When things weren't working, I did some checking on newer ffmpeg to
+# see if that helped. It never did. I compiled the latest ffmpeg release
+# tarball, 7.0.1, and tried the version in debian bullseye by schrooting
+# before running ffmpeg. Building was just configure; make, but then I
+# found some flags that were needed. gpl flags r just because I noticed them.
+# ./configure --enable-libzmq --enable-libpulse --enable-libvorbis --enable-gpl --enable-version3
+#
+
+### end background/development docs ###
+
if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
-# 3 mountpoints: fsf-sysops (public), fsf (default, all staff), fsf-tech (tech team)
-case $1 in
- sysops|tech)
- mount_suffix=-$1
- ;;
-esac
+debug=false
+loglevel=fatal
+
+# 3 mountpoints: fsf-sysops (default, public), fsf (all staff), fsf-tech (tech team)
+# # note: duplicated in ffp
+mount_suffix=-sysops
+while [[ $1 ]]; do
+ case $1 in
+ sysops|tech)
+ mount_suffix=-$1
+ ;;
+ staff)
+ mount_suffix=
+ ;;
+ -d)
+ debug=true
+ loglevel=debug
+ ;;
+ esac
+ shift
+done
host=live.iankelling.org:8000
if [[ $(dig +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]] \
stream_res=$primary_res
fi
+framerate=8
+keyframe_interval=$((framerate * 2))
+
+# Monitor of default sink.
+# eg: alsa_output.usb-Audio-gd_Audio-gd-00.analog-stereo
+pa_sink=$(pacmd list-sinks | awk '/\*/ {getline; print $2}' | sed 's/^<//;s/>$//').monitor
opts=(
- # nice to have: be a little less verbose
+ # global options
+ # be relatively quiet. switch to debug when testing.
+ -v $loglevel
-hide_banner
+ -nostats
+
+ # note: ordering of inputs also affects zmqsend commands.
+
+ ## audio input options
+
+ -f pulse
+ -name ffs
+ # note: duplicated above
+ -thread_queue_size 160
+ -fragment_size 512
+ -i default
+
+ -f pulse
+ # this is for ffmpeg warnings. doesnt seem to affect latency.
+ -thread_queue_size 160
+ # pulse knows this name somewhere
+ -name ffsdesktop
+ # This fixes latency. i haven't tried tuning it, but going too low creates
+ # choppy output.
+ -fragment_size 512
+ -i "$pa_sink"
+
+
+ ## video input options
-video_size $stream_res
-f x11grab
- -framerate 4
- # input options come before -i
+ -framerate $framerate
-i :0.0+$x_offset.0
- -vf drawbox=color=black
+
+ # Video + audio filter. Note: this has only the things we actually need in it.
+ #
+ # volume=precision=fixed fixes this error:
+ # The following filters could not choose their formats: Parsed_amerge_4.
+ #
+ # Default volume precision is float. Our input is fixed. maybe ffmpeg
+ # thinks the input could change and so can't commit to an output.
+ # The error suggests using aformat, which seems like it would probably
+ # also fix the error.
+ #
+ # man page say zmq url default includes "localhost", but specifying a
+ # localhost url caused an error for me.
+ -filter_complex "[0]azmq,volume=precision=fixed: volume=0 [vol0];
+[1]azmq='b=tcp\://127.0.0.1\:5556',volume=precision=fixed: volume=0 [vol1];
+[vol0][vol1] amerge=inputs=2 [out];
+[2]zmq='b=tcp\://127.0.0.1\:5557',drawbox=color=0x262626,drawtext=fontsize=90: fontcolor=beige: x=40: y=40: text=''"
+
+ # Based on error message and poking around, it seems ffmpeg is not
+ # smart enough to see that [vol0] and [vol1] are inputs to the amerge
+ # filter, and thus we would not want them as final outputs. So, we
+ # have to identify the amerge output and pass it to -out. This
+ # identifier is called an "output pad" in man ffmpeg-filters, and a
+ # "link label" in man ffmpeg.
+ -map '[out]'
+
+ # video output options
-vcodec libvpx
- -g 8
+ -g $keyframe_interval
-quality realtime
+ # for 1080p, default 256k is poor quality. 500 is ok. 1500 is a bit better.
+ -b:v 1500k
-threads 2
+ -buffer_duration 10
-error-resilient 1
+
+ ## audio output options
+ -c:a libvorbis
+ -b:a 128k
+ # afaik, this ensures that the amerge doesn't make 4 channel output if
+ # our output format supported it.
+ -ac 2
+
-content_type video/webm
-f webm
icecast://source:$pass@$host/fsf$mount_suffix.webm
-
)
+rm -f /tmp/iank-ffmpeg-interlude-toggle
+
+# start muted
+pactl set-source-mute @DEFAULT_SOURCE@ true
+
+#echo executing: ffmpeg ${opts[@]}
+
+#{ sleep 1; ffp &>/dev/null & }
+
+if $debug; then
+ ffmpeg "${opts[@]}"
+ exit 0
+fi
-rm -f /tmp/iank-ffmpeg
-mkfifo -m 0600 /tmp/iank-ffmpeg
-echo executing: ffmpeg -stdin ${opts[@]}
-# ffmpeg sits and waits until we do this. dunno why. whatever.
-echo >/tmp/iank-ffmpeg &
-ffmpeg ${opts[@]} </tmp/iank-ffmpeg
+# For now, we want to watch the stream and end the stream when we stop watching.
+ffmpeg "${opts[@]}" &
+sleep 2
+ffp ||:
+kill %%
iankelling.org / git / distro-setup / blobdiff