ffmpeg-broadcaster/gstreamer-screencaster

#!/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=$SCREENCAP_SRC
VIDEO_CAPS=$SCREENCAP_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"


TESTING_COMPOSITOR="
VIDEO_TEST_SRC1='videotestsrc pattern=1'
VIDEO_TEST_SRC2='videotestsrc pattern=0'
VIDEO_TEST_CAPS1='video/x-raw,format=I420, framerate=10/1, width=640, height=480'
VIDEO_TEST_CAPS2='video/x-raw,format=I420, framerate=10/1, width=160, height=120'
COMPOSITOR='compositor name=comp sink_1::xpos=480 sink_1::ypos=360 sink_1::zorder=1'
gst-launch-1.0 $VIDEO_TEST_SRC1    ! \
                 $VIDEO_TEST_CAPS1 ! \
                 comp.               \
               $VIDEO_TEST_SRC2    ! \
                 $VIDEO_TEST_CAPS2 ! \
                 comp.               \
               $COMPOSITOR    !      \
                 videoconvert !      \
                 ximagesink
exit
"


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