this repo contains two analogous script prototypes for screencasting to livecoding.tv
- ffmpeg implementation - full-featured and works quite well
- gstreamer implementetion - work in progress
Forked from bill-auger/00-livecoding-screencaster.md
Created
November 16, 2015 07:39
-
-
Save Gjum/7351b5fda8f6990a4cd9 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/bin/bash | |
| THIS_NAME=`basename $0` | |
| USAGE="USAGE: | |
| $THIS_NAME [ a_configuration [ once ] ] | |
| when called with no arguments the stream runs the default configuration, automatically | |
| restarting after any exceptional event (device error , dropped connection , etc) | |
| the optional \"a_configuration\" selects a particular configuration and is one of: | |
| [ screen , screen+text , screen+cam , cam+text , all , break ] | |
| the optional second argument 'once' disables automatic restarts | |
| NOTE: STREAM_KEY must be defined either in this script or in the environment | |
| NOTE: all configurations include audio - set CAPTURE_AUDIO to 0 to disable" | |
| # the entries under the following headings are intended for per-user configuration: | |
| # * user a/v params (STREAM_KEY must be defined) | |
| # * user image params | |
| # * user text params | |
| # * user text configuration | |
| # * user a/v configuration | |
| # * user logging configuration | |
| # | |
| # the entries under the following headings are general and suitable for most cases: | |
| # * general a/v params | |
| # * general text params | |
| # * general logging params | |
| # * general a/v configuration | |
| # | |
| # when one of the configurations displaying text is chosen | |
| # the first line of $TEXT_FILE will be rendered | |
| # user a/v params | |
| [ ! -z "$STREAM_KEY" ] || STREAM_KEY="" # your private stream key (or define STREAM_KEY in env) | |
| SCREEN_W=1280 # input screen width (e.g. desktop width ) | |
| SCREEN_H=800 # input screen height (e.g. desktop height) | |
| SCREEN_N=":0.0" # display/screen number to capture (usually :0.0) | |
| CAM_LG_W=640 # input screen width (e.g. desktop width ) | |
| CAM_LG_H=480 # input screen height (e.g. desktop height) | |
| CAM_SM_W=160 # input screen width (e.g. desktop width ) | |
| CAM_SM_H=120 # input screen height (e.g. desktop height) | |
| CAM_DEV=/dev/video42 # video device to grab (first is /dev/video0) | |
| STREAM_W=1280 # input screen width (e.g. desktop width ) | |
| STREAM_H=800 # input screen height (e.g. desktop height) | |
| FPS=12 # target output FPS | |
| GOP="$(($FPS*4))" # i-frame interval | |
| CBR="1200k" # constant output bitrate (should be between 800k - 1300k) | |
| CAPTURE_AUDIO=1 # set to 1 to capture audio - 0 to disable audio | |
| AUDIO_CHANNELS=2 # number of channels | |
| AUDIO_SAMPLERATE=22050 # audio samplerate (22050 is plenty for voice) | |
| AUDIO_BITRATE="128k" # audio bitrate (64k per channel is plenty for voice) | |
| ALSA_DEVICE="hw:0" # ALSA plug device (usually hw:0) | |
| THREADS=0 # 0 for auto - max 6 | |
| QUALITY="ultrafast" # one of the many FFMPEG presets | |
| EXIT_CMD="play-error-sound.sh" | |
| # user image params | |
| [ ! -z "$STREAM_IMG" ] || STREAM_IMG="" # fullscreen interstitial image (or define STREAM_IMG in env) | |
| [ ! -z "$LOGO_IMG" ] || LOGO_IMG="" # small overlay image (or define LOGO_IMG in env) | |
| # user text params | |
| TEXT_FILE=/run/user/`id -u`/av-caster-text | |
| [ ! -z "$STREAM_TEXT" ] || STREAM_TEXT="" # initial overlay text (or define STREAM_TEXT in env) | |
| FONT_FILE=/usr/share/fonts/truetype/tlwg/Purisa.ttf | |
| FONT_SIZE=48 | |
| TEXT_BORDER_D=4 | |
| TEXT_SHADOW_W=8 | |
| TEXT_SHADOW_H=8 | |
| BLINK_TEXT_PERIOD=300 # repeat interval in seconds | |
| TEXT_MARQUEE_SPEED=6 # ~= n characters per second | |
| TEXT_COLOR='[email protected]' | |
| TEXT_BORDER_COLOR='[email protected]' | |
| TEXT_BG_COLOR='[email protected]' | |
| # general a/v params | |
| SCREEN_RES=$SCREEN_W'x'$SCREEN_H # screen capture input resolution | |
| CAM_HI_RES=$CAM_LG_W'x'$CAM_LG_H # webcam input/output high resolution (fullscreen) | |
| CAM_LO_RES=$CAM_SM_W'x'$CAM_SM_H # webcam input/output low resolution (overlay) | |
| STREAM_RES=$STREAM_W'x'$STREAM_H # mix output resolution | |
| SCREENCAP_INPUT="-f x11grab -s $SCREEN_RES -r $FPS -i $SCREEN_N" | |
| WEBCAM_INPUT_LG="-f video4linux2 -s $CAM_HI_RES -i $CAM_DEV" | |
| WEBCAM_INPUT_SM="-f video4linux2 -s $CAM_LO_RES -i $CAM_DEV" | |
| STATIC_INPUT_LG="-f image2 -loop 1 -r $FPS -i $STREAM_IMG" | |
| STATIC_INPUT_SM="-f image2 -loop 1 -r $FPS -i $LOGO_IMG" # unused | |
| ALSA_INPUT=" -f alsa -i $ALSA_DEVICE" # unused | |
| PULSE_INPUT=" -f pulse -name $THIS_NAME -sample_rate $AUDIO_SAMPLERATE | |
| -channels $AUDIO_CHANNELS -i default" # unused | |
| JACK_INPUT=" -f jack -channels $AUDIO_CHANNELS -i $THIS_NAME" | |
| OVERLAY_TL_POS="0: 0" # unused | |
| OVERLAY_BR_POS="main_w-overlay_w: main_h-overlay_h" | |
| X264_OUTPUT="-vcodec libx264 -pix_fmt yuv420p -preset $QUALITY -s $STREAM_RES | |
| -g $GOP -vb $CBR -maxrate $CBR -bufsize $CBR" | |
| AAC_OUTPUT="-acodec aac -ar $AUDIO_SAMPLERATE -ab $AUDIO_BITRATE -strict experimental" | |
| THREADS="-threads $THREADS" | |
| RTMP_URL="rtmp://usmedia3.livecoding.tv:1935/livecodingtv/$STREAM_KEY" | |
| DUMP_FILE=./livecoding.mp4 | |
| FILE_OUTPUT="-f flv $DUMP_FILE" | |
| LIVE_OUTPUT="-f flv $RTMP_URL" | |
| # general text params | |
| FONT='fontfile='$FONT_FILE': fontsize='$FONT_SIZE': fontcolor='$TEXT_COLOR': shadowx='$TEXT_SHADOW_W' : shadowy='$TEXT_SHADOW_H | |
| TEXT_BG='box=1: boxcolor='$TEXT_BG_COLOR # unused | |
| TEXT_BORDER='borderw='$TEXT_BORDER_D': bordercolor='$TEXT_BORDER_COLOR | |
| [ ! -z "$TEXT_FILE" ] && [ -f $TEXT_FILE ] && STREAM_TEXT=`cat $TEXT_FILE` | |
| BLINK_TEXT_DURATION=$((${#STREAM_TEXT}/$TEXT_MARQUEE_SPEED)) | |
| BLINK_TEXT=': enable=lt(mod(t\,'$BLINK_TEXT_PERIOD')\,'$BLINK_TEXT_DURATION')' # unused | |
| STATIC_TEXT='text='$STREAM_TEXT # unused | |
| TEXT_X_CENTER_POS='x=(main_w-text_w)/2' | |
| TEXT_Y_TOP_POS='y=0' # unused | |
| TEXT_Y_BOTTOM_POS='y=main_h-(line_h*1.5)' | |
| TEXT_X_MARQUEE_POS='x=main_w-((('$SCREEN_W'+text_w)/'$BLINK_TEXT_DURATION')*mod(t\,'$BLINK_TEXT_DURATION'))'$BLINK_TEXT | |
| FILE_TEXT="textfile=$TEXT_FILE: reload=1" | |
| # general logging params | |
| LOGGING_NONE="-loglevel quiet" | |
| LOGGING_ERRORS="-loglevel error" | |
| LOGGING_VERBOSE="" | |
| # user a/v configuration | |
| OVERLAY_INPUT=$WEBCAM_INPUT_SM # one of WEBCAM_INPUT_SM , STATIC_INPUT_SM | |
| OVERLAY_POS=$OVERLAY_BR_POS # one of OVERLAY_TL_POS , OVERLAY_BR_POS | |
| AUDIO_INPUT=$JACK_INPUT # one of ALSA_INPUT , PULSE_INPUT , JACK_INPUT | |
| VIDEO_OUTPUT=$X264_OUTPUT # only X264_OUTPUT is defined (others are possible) | |
| AUDIO_OUTPUT=$AAC_OUTPUT # only AAC_OUTPUT is defined (others are possible) | |
| STREAM_OUTPUT=$LIVE_OUTPUT # one of FILE_OUTPUT , LIVE_OUTPUT | |
| # general a/v configuration | |
| [ ! -z "$TEXT_FILE" ] && [ ! -f $TEXT_FILE ] && echo "$STREAM_TEXT" > $TEXT_FILE | |
| (($CAPTURE_AUDIO)) || (AUDIO_INPUT="" ; AUDIO_OUTPUT="") | |
| # user text configuration | |
| TEXT=": $FILE_TEXT" | |
| # TEXT_POS=": $TEXT_X_CENTER_POS: $TEXT_Y_BOTTOM_POS" | |
| TEXT_POS=": $TEXT_X_MARQUEE_POS: $TEXT_Y_BOTTOM_POS" | |
| TEXT_DECORATIONS=": $TEXT_BORDER" | |
| DRAWTEXT_PARAMS="$FONT $TEXT $TEXT_POS $TEXT_DECORATIONS" | |
| # user logging configuration | |
| LOGGING=$LOGGING_NONE # console output (one of LOGGING_NONE , LOGGING_ERRORS , LOGGING_VERBOSE) | |
| screenOnly() | |
| { | |
| printf "\nlaunching screenOnly configuration\n\n" | |
| ffmpeg $SCREENCAP_INPUT \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| echo "QUIT=$QUIT" | |
| } | |
| screenPlusText() | |
| { | |
| printf "\nlaunching screenPlusText configuration\n\n" | |
| ffmpeg $SCREENCAP_INPUT \ | |
| -filter_complex drawtext="$DRAWTEXT_PARAMS" \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| } | |
| screenPlusCam() | |
| { | |
| printf "\nlaunching screenPlusCam configuration\n\n" | |
| avconv $SCREENCAP_INPUT \ | |
| $OVERLAY_INPUT \ | |
| -filter_complex overlay="$OVERLAY_POS" \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| } | |
| camPlusText() | |
| { | |
| printf "\nlaunching camPlusText configuration\n\n" | |
| ffmpeg $WEBCAM_INPUT_LG \ | |
| -filter_complex drawtext="$DRAWTEXT_PARAMS" \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| } | |
| screenPlusCamPlusText() | |
| { | |
| printf "\nlaunching screenPlusCamPlusText configuration\n\n" | |
| ffmpeg $SCREENCAP_INPUT \ | |
| $OVERLAY_INPUT \ | |
| -filter_complex "overlay='$OVERLAY_POS', drawtext='$DRAWTEXT_PARAMS'" \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| } | |
| interstitial() | |
| { | |
| printf "\nlaunching interstitial configuration\n\n" | |
| ffmpeg $STATIC_INPUT_LG \ | |
| $AUDIO_INPUT \ | |
| $VIDEO_OUTPUT \ | |
| $AUDIO_OUTPUT \ | |
| $THREADS \ | |
| $LOGGING \ | |
| $STREAM_OUTPUT | |
| QUIT=$? | |
| } | |
| launch() | |
| { | |
| printf "\nstream started at `date`\n\n$QUIT_MSG" ; | |
| $SELECTED_CONFIGURATION | |
| printf "\nstream ended at `date`\n\n" ; | |
| } | |
| # swicth on configuration | |
| SELECTED_CONFIGURATION="screenPlusCamPlusText" | |
| [ "$1" == "screen" ] && SELECTED_CONFIGURATION="screenOnly" | |
| [ "$1" == "screen+text" ] && SELECTED_CONFIGURATION="screenPlusText" | |
| [ "$1" == "screen+cam" ] && SELECTED_CONFIGURATION="screenPlusCam" | |
| [ "$1" == "cam+text" ] && SELECTED_CONFIGURATION="camPlusText" | |
| [ "$1" == "all" ] && SELECTED_CONFIGURATION="screenPlusCamPlusText" | |
| [ "$1" == "break" ] && SELECTED_CONFIGURATION="interstitial" | |
| # sanity checks | |
| if [ -z "$STREAM_KEY" ] ; then echo "STREAM_KEY undefined" ; exit ; fi ; | |
| if [ -z "$STREAM_IMG" ] && [ "$SELECTED_CONFIGURATION" == "interstitial" ] | |
| then echo "STREAM_IMG undefined" ; exit ; fi ; | |
| # launch configuration once | |
| QUIT_MSG="press <q> to exit" | |
| if [ "$2" == "once" ] ; then launch ; exit ; fi ; | |
| # launch configuration indefinitely | |
| QUIT_MSG="press <q> to restart the stream - press <CTRL-c> to exit" | |
| # while ! (($QUIT)) ; do sleep 1 ; launch ; $EXIT_CMD ; done ; | |
| # TODO: ffmpeg exits with 0 on server kick - need some way to trap this | |
| while ((1)) ; do sleep 1 ; launch ; $EXIT_CMD ; done ; |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/bin/bash | |
| # NOTE: this script is not yet working properly | |
| # screencap works well as do videotestsrc and audiotestsrc | |
| # but using alsa , pulse , or jack audio cause the audio to be intermittent | |
| # e.g. recording "test 1 2 3 4 5 6 7 8 9" results like "test 3 6 8 9" | |
| # configuration | |
| WIDTH=1280 | |
| HEIGHT=800 | |
| FPS=12 | |
| VIDEO_BITRATE=1200 | |
| SAMPLERATE=44100 | |
| AUDIO_BITRATE=128 | |
| N_CHANNELS=2 | |
| # constants | |
| VIDEO_TEST_SRC='videotestsrc pattern=0 is-live=true' | |
| AUDIO_TEST_SRC='audiotestsrc is-live=true' | |
| # SCREENCAP_SRC="ximagesrc endx=$(($WIDTH-1)) endy=$(($HEIGHT-1)) use-damage=false show-pointer=true" | |
| # TIME_SRC='timeoverlay halignment=left valignment=top text="t:" shaded-background=true' | |
| PULSE_SRC='pulsesrc' | |
| H264_ENCODER="x264enc bitrate=$VIDEO_BITRATE bframes=0" | |
| LAME_ENCODER="lamemp3enc bitrate=$AUDIO_BITRATE" | |
| # VIDEO_TEST_CAPS="video/x-raw, format=(string)BGRA, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=$FPS/1, width=$WIDTH, height=$HEIGHT" | |
| # AUDIO_TEST_CAPS="audio/x-raw, format=(string)S16LE, endianness=(int)1234, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)$SAMPLERATE, channels=(int)$N_CHANNELS" | |
| # PULSE_CAPS=" audio/x-raw, format=(string)S16LE, rate=(int)$SAMPLERATE, channels=(int)$N_CHANNELS, layout=(string)interleaved" | |
| VIDEO_TEST_CAPS="video/x-raw, format=(string)BGRA, framerate=(fraction)$FPS/1, width=(int)$WIDTH, height=(int)$HEIGHT" | |
| AUDIO_TEST_CAPS="audio/x-raw, format=(string)S16LE, rate=(int)$SAMPLERATE, channels=(int)$N_CHANNELS" | |
| SCREENCAP_CAPS=" video/x-raw, framerate=(fraction)$FPS/1, width=(int)$WIDTH, height=(int)$HEIGHT, pixel-aspect-ratio=(fraction)1/1" | |
| PULSE_CAPS=" audio/x-raw, format=(string)S16LE, rate=(int)$SAMPLERATE, channels=(int)$N_CHANNELS" | |
| H264_ENC_CAPS=' video/x-h264, level=(string)4.1, profile=main' | |
| FLV_MUXER='flvmux streamable=true name=mux' | |
| OUTPUT_FILE=./deleteme.flv | |
| FILE_OUTPUT="filesink location=$OUTPUT_FILE" | |
| DEBUG_LOGGING='--gst-debug-level=2' | |
| VERBOSE_LOGGING='--verbose' | |
| # input selections | |
| VIDEO_SRC=$VIDEO_TEST_SRC | |
| VIDEO_CAPS=$VIDEO_TEST_CAPS | |
| # OVERLAY_SRC=$TIME_SRC # NOTE: put OVERLAY_SRC between VIDEO_SRC and VIDEO_CAPS | |
| VIDEO_ENC_CAPS=$H264_ENC_CAPS | |
| VIDEO_ENCODER=$H264_ENCODER | |
| # AUDIO_SRC=$AUDIO_TEST_SRC | |
| AUDIO_SRC=$PULSE_SRC | |
| # AUDIO_CAPS=$AUDIO_TEST_CAPS | |
| AUDIO_CAPS=$PULSE_CAPS | |
| AUDIO_ENCODER=$LAME_ENCODER | |
| MUXER=$FLV_MUXER | |
| OUTPUT_STREAM=$FILE_OUTPUT | |
| LOGGING="$DEBUG_LOGGING $VERBOSE_LOGGING" | |
| gst-launch-1.0 $LOGGING $VIDEO_SRC ! \ | |
| $VIDEO_CAPS ! \ | |
| queue ! \ | |
| videoconvert ! \ | |
| $VIDEO_ENCODER ! \ | |
| h264parse ! \ | |
| $VIDEO_ENC_CAPS ! \ | |
| queue ! \ | |
| mux. \ | |
| $AUDIO_SRC ! \ | |
| $AUDIO_CAPS ! \ | |
| queue ! \ | |
| queue ! \ | |
| $AUDIO_ENCODER ! \ | |
| mpegaudioparse ! \ | |
| queue ! \ | |
| queue ! \ | |
| queue ! \ | |
| mux. \ | |
| $MUXER ! \ | |
| queue ! \ | |
| $OUTPUT_STREAM |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment