#!/bin/bash

# Command line options
INPUT=$1
OUTPUT_DIR=$2

# Recommended min quality for 1080p HD = 22
# Quality 17 ~ 30% of the original size
# Quality 18 ~ 25% of the original size
# Quality 20 ~ 15% of the original size
# Quality 25 ~ 75% of the original size (for 1080p/60fps content)
# Quality 26 ~ 60% of the original size (for 1080p/60fps content)
# Quality 27 ~ 50% of the original size (for 1080p/60fps content)
QUALITY=18

if [ -z "$INPUT" ]; then
  echo "Usage: $0 input outputdir"
  exit 1
fi

if [ -z "$OUTPUT_DIR" ]; then
    OUTPUT_DIR="."
fi

FILENAME=`basename "${INPUT%.*}"`
OUTPUT="$OUTPUT_DIR/$FILENAME.mkv"

# We want our audio to be pass-through, so detect what the audio of the input is encoded with, and tell handbrake to make the output match
AUDIO_CODEC=`avconv -i "$INPUT" 2>&1 | grep "Audio" | sed -r -e 's/.*?Audio: (\S+),.*?/\1/'`
if [ -z "$AUDIO_CODEC" ]; then
  echo "-E- Unable to determine audio codec to use for the input video: $INPUT"
  exit 1
fi
AUDIO_ENC="copy:$AUDIO_CODEC"

echo "-> Converting \"$INPUT\" to 1080p compressed \"$OUTPUT\" file using audio codec $AUDIO_CODEC"

if [[ -e "$OUTPUT" ]]; then
  echo "-E- Output file $OUTPUT already exists. Aborting..."
  exit 1
fi

# --deblock
# --decomb
# --denoise="weak" 
# deblock=1,1
# subme=10:trellis=2

# 1080i
#QUALITY=18
#HandBrakeCLI -i "$INPUT" -o "$OUTPUT" -f mkv --denoise="weak" -e x264 -q $QUALITY -x b-adapt=2:rc-lookahead=120 -v 2 -E $AUDIO_ENC -a 1 -6 dpl2 --strict-anamorphic --crop 0:0:0:0 --preset="High Profile" --decomb 

# 1080p
QUALITY=25
HandBrakeCLI -i "$INPUT" -o "$OUTPUT" -f mkv --denoise="weak" --deblock -e x264 -q $QUALITY -x b-adapt=2:rc-lookahead=120:deblock=1,1:subme=10:trellis=2 -v 2 -E $AUDIO_ENC -a 1 -6 dpl2 --auto-anamorphic --crop 0:0:0:0 --preset="Very Fast 1080p30" --decomb