#!/usr/bin/env bash

which ffmpeg

if [ $# -lt 1 ] ; then
    echo "Usage: ${0} INPUT"
    echo "Example input can be generated with: "
    echo "  ffmpeg -v verbose -filter_complex 'testsrc2=r=25:s=640x480:d=470[out]' -map '[out]' -c:v libx264 -preset superfast test_clip.mp4"
    exit 1
fi

INPUT="${1}"
COPY_OUTPUT="${INPUT}_copy.mp4"
IMG2_OUTPUT="${INPUT}_img2.jpg"

echo "Input: ${INPUT}"

# if you get ooms, feel free to utilize ulimit
# (ulimit -v 5000000 && )

/usr/bin/time -v \
ffmpeg \
  -y -ignore_unknown \
  -v verbose \
  -i "${INPUT}" \
    -c copy -map 0 \
    -t 470 \
    "${COPY_OUTPUT}" \
  -filter_complex '[0:0]split=1[thumb_in];[thumb_in]trim=start=420:end=421,scale=720:-2:threads=1,setsar=1/1,hqdn3d,unsharp[thumb_out]' \
    -map "[thumb_out]" \
    -vframes 1 \
    -f image2 \
  "${IMG2_OUTPUT}"