capture-full-replay.sh

#!/bin/bash

scriptdir=$(dirname $(realpath $0))

# progress_bar.sh copied from https://github.com/nachoparker/progress_bar.sh
. $scriptdir/progress_bar.sh

# This will capture the replay, played in a controlled web browser,
# using a Docker container running Selenium

usage()
{
cat << EOF
usage: $0 [options] URL

OPTIONS:
   -?                               Show this message
   -s startup_duration              Remove the first startup_duration seconds of the video
   -e stop_duration                 Cut the video after stop_duration (from the start of the input video)
   -m   	       	            Only show the main screen (ie. remove the webcam)
   -c 				    Don't crop the output video
   -o output_file		    Select the output file
   -S 				    Save all the downloaded videos
   -i input_file		    Download all the videos specified in input_file
   -v                               Enable verbose mode 
EOF
}


startup_duration=5 # duration of firefox startup (that will be cut out of the video)
stop_duration=0
main_screen_only=n
crop=y
output_file=""
save=n
input_file=""
verbose=n
while getopts 's:e:mco:Si:v' OPTION; do
    case $OPTION in
	s)
	    startup_duration=$OPTARG
	    ;;
	e)
	    stop_duration=$OPTARG
	    ;;
	m)
	    main_screen_only=y
	    ;;
	c)
	    crop=n
	    ;;
	o)
	    output_file=$OPTARG
	    ;;
	S)
	    save=y
	    ;;
	i)
	    input_file=$OPTARG
	    ;;
	v)
	    verbose=y
	    ;;
	?)
	usage
	exit 2
	;;
    esac
done

# remove the options from the command line
shift $(($OPTIND - 1))

if [ $verbose = y ]; then
    set -x
fi

function capture() {
    url=$1
    output_file=$2
    video_id=$3

    if [ -z "$url" ]; then
	exit 1
    fi

    if [ -z "$video_id" ]; then
	exit 1
    fi

    if [ -z "$output_file" ]; then
	output_file=$video_id.mp4
    fi

    echo "Downloading $url, and saving it as '$output_file'."
    # Extract duration from associate metadata file
    #seconds=$(python3 bbb.py duration "$url")

    python3 $scriptdir/download_bbb_data.py -V "$url" "$video_id"
    if [ $stop_duration -eq 0 ]; then
	seconds=$(ffprobe -i $video_id/Videos/webcams.webm -show_entries format=duration -v quiet -of csv="p=0")
	seconds=$( echo "($seconds+0.5)/1" | bc 2>/dev/null)
	if [ -z "$seconds" ]; then
	    seconds=$(python3 $scriptdir/bbb.py duration "$url")
	    if [ -z "$seconds" ]; then
		echo "Failed to detect the duration of the presentation" >&2
		# bbb.py failed because of a wrong url
		exit 1
	    fi
	fi

    else
	seconds=$stop_duration
    fi

    # Add some delay for selenium to complete
    seconds=$(expr $seconds + 5)
    if [ -z "$seconds" ]; then
	echo "Failed to detect the duration of the presentation" >&2
	exit 1
    fi

    container_name=grid$$

    # Startup Selenium server
    #  -e VIDEO_FILE_EXTENSION="mkv" \
	#  -p 5920:25900 : we don't need to connect via VNC
    docker run --rm -d --name=$container_name -P --expose 24444 \
	   --shm-size=2g -e VNC_PASSWORD=hola \
	   -e VIDEO=true -e AUDIO=true \
	   -e SCREEN_WIDTH=1080 -e SCREEN_HEIGHT=720 \
	   -e FFMPEG_DRAW_MOUSE=0 \
	   -e FFMPEG_FRAME_RATE=24 \
	   -e FFMPEG_CODEC_ARGS="-vcodec libx264 -preset ultrafast -pix_fmt yuv420p -strict -2 -acodec aac" \
	   elgalu/selenium

    if [ $? -ne 0 ]; then
	echo "docker run failed!" >&2
	exit 1
    fi
    bound_port=$(docker inspect --format='{{(index (index .NetworkSettings.Ports "24444/tcp") 0).HostPort}}' $container_name)

    docker exec $container_name wait_all_done 30s

    echo 
    echo "Please wait for $seconds seconds, while we capture the playback..."
    echo

    # Run selenium to capture video
    node $scriptdir/selenium-play-bbb-recording.js "$url" $seconds $bound_port &

    # First wait for making sure the playback is started
    sleep 10

    # Now wait for the duration of the recording, for the capture to happen

    # Instead of waiting without any feedback to the user with a simple
    # "sleep", we use the progress bar script.
    # Use plain "sleep" if on MacOSX or other cases where progress_bar won't do.
    #sleep $(echo "$seconds - 10" | bc)
    progress_duration=$(echo "$seconds - 10" | bc)

    set +x # disable verbosity to avoid flooding the logs
    progress_bar $progress_duration
    if [ $verbose = y ]; then
	set -x
    fi

    # Save the captured video
    docker exec $container_name stop-video

    output_dir=$(mktemp -d)

    docker cp $container_name:/videos/. $output_dir/
    docker stop $container_name
    docker kill $container_name

    captured_video=$(ls -1 $output_dir/*.mp4)

    if [ "$crop" = "y" ]; then
	if [ "$main_screen_only" = y ]; then
	    OPTIONS=-m
	else
	    OPTIONS=""
	fi
	bash $scriptdir/crop_video.sh -s "$startup_duration" -e "$stop_duration" $OPTIONS $captured_video $output_file
    else
	mv $captured_video $output_file
    fi
    rm -fr $output_dir

    if [ "$save" = n ]; then
	rm -r $video_id
    fi

    echo
    echo "DONE. Your video is ready in $output_file"
    
}

if [ -z "$input_file" ]; then

    if [ $# -lt 1 ]; then
	usage
	exit 2
    fi

    url=$1
    if [ -n "$url" ]; then
	video_id=$(python3 $scriptdir/bbb.py id "$url")
	capture "$url" "$output_file" "$video_id" 2>&1 |tee "capture_${video_id}.log"
    fi
else
    if ! [ -r $input_file ]; then
	echo "Error: cannot open  file $input_file" >&2
	exit 2
    fi

    while read url output_file ; do
	if [ -n "$url" ]; then
	    output_file=$(echo $output_file| tr -d '\r')
	    video_id=$(python3 $scriptdir/bbb.py id "$url")
	    capture "$url" "$output_file" "$video_id" 2>&1 |tee "capture_${video_id}.log"
	fi
    done < $input_file
    exit 1
fi