#!/bin/bash

# This will add:
# - a five-second slate to the beginning of the input movie
# - Three thumbnails taken from pre-selected times in the input movie will be on the slate
# - A lower-third text will be printed to the entire length of the outpu 
# - Then entire output will be standardized to 1920x1080
# - Audio output is 48000 pcm_s24le
#
# The INPUT_FILE is expected as argument 1 on the command line, the idea being you might make a copy
# of this script for each project and customise the thumbnail positions, client and title, while the
# movie always changes
# 
# The output file will be name INPUT_FILE_slated.


# Enter project info here
PROJECT_TITLE="\"PROJECT TITLE HERE\""
CLIENT="Client"
CONTACT="Jamie Hardt / SQUAD 51 / jamie@squad51.us / (310) 874-5620"
MESSAGE="Sound Review $(date +%m/%d)"

# Enter the times for each thumbnail here
THUMB1_TIME="00:02:56"
THUMB2_TIME="00:36:01"
THUMB3_TIME="01:11:56"

# Set this to "-to 20" while you're testing your script out, once it looks 
# right then set it to ""
OUTPUT_LENGTH_ARG="-to 20" 

# Set this to a positive number to move the lower-third and "file" field in 
# the slate up/north, to avoid covering burnins
BOTTOM_Y_NUDGE="90"

### DON'T EDIT BELOW THIS LINE ###
INPUT_FILE="$1"
INPUT_BASENAME=$(basename -- "$INPUT_FILE")
OUTPUT_FILE=$(dirname -- "$INPUT_FILE")/"${INPUT_BASENAME%.*}_slated.mov"


ffmpeg -y \
  -f lavfi -i "color=c=black:s=1920x1080:d=5" \
  -ss $THUMB1_TIME -i "$INPUT_FILE" \
  -ss $THUMB2_TIME -i "$INPUT_FILE" \
  -ss $THUMB3_TIME -i "$INPUT_FILE" \
  -i "$INPUT_FILE" \
  -f lavfi -t 5 -i "anullsrc=r=48000:cl=stereo, aformat=sample_fmts=s32:channel_layouts=stereo" \
  -filter_complex "
    [1:v]trim=duration=0.04,setpts=PTS-STARTPTS,scale=560:-1,tpad=stop_mode=clone:stop_duration=5[thumb1];
    [2:v]trim=duration=0.04,setpts=PTS-STARTPTS,scale=560:-1,tpad=stop_mode=clone:stop_duration=5[thumb2];
    [3:v]trim=duration=0.04,setpts=PTS-STARTPTS,scale=560:-1,tpad=stop_mode=clone:stop_duration=5[thumb3];

    [0:v][thumb1]overlay=100:100[tmp1];
    [tmp1][thumb2]overlay=690:100[tmp2];
    [tmp2][thumb3]overlay=1280:100[slate_raw];

    [slate_raw]drawtext=text='$PROJECT_TITLE':fontcolor=white:fontsize=72:x=(w-text_w)/2:y=(h/2-100)[s1];
    [s1]drawtext=text='Client\: $CLIENT':fontcolor=white:fontsize=48:x=(w-text_w)/2:y=(h/2)[s2];
    [s2]drawtext=text='$CONTACT':fontcolor=white:fontsize=24:x=(w-text_w)/2:y=(h/2+100)[s3];
    [s3]drawtext=text='File\: $INPUT_BASENAME':expansion=normal:fontcolor=gray:fontsize=28:x=(w-text_w)/2:y=(h-(140+$BOTTOM_Y_NUDGE))[slate];

    [4:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black, setsar=1:1[v1];
    [4:a]aresample=48000,aformat=sample_fmts=s32:channel_layouts=stereo[a1];

    [slate][5:a][v1][a1]concat=n=2:v=1:a=1[vcat][acat];
    [vcat]drawtext=text='$MESSAGE':fontcolor=white:box=1:boxcolor=black:boxborderw=10:fontsize=42:x=(w-text_w)/2:y=h-(100+$BOTTOM_Y_NUDGE)[outv]
  " \
  -map "[outv]" -map "[acat]" \
  -c:v libx264 -pix_fmt yuv420p -c:a pcm_s24le -movflags +faststart $OUTPUT_LENGTH_ARG "$OUTPUT_FILE"