Use ffmpeg to build proxies for Davinci Resolve from iphone video clips

proresproxy.sh

#!/usr/bin/env bash

# Usage notes
# ===========
#
# ./proresproxy.sh my-project
#
# This will create Proxies -folder inside of my-project where it will put all video files inside of my-project
#
# .
# proresproxy.sh
# my-project
#
# =>
#
# .
# proresproxy.sh
# my-project
#    Proxies
#
# on OSX, both pv and ffmpeg will need to be installed via homebrew



inputFolder=$1

rm -rf "$inputFolder/Proxies"
mkdir "$inputFolder/Proxies"

# find input resolution
# =====================

# input aspects:
#   cine 4K = 4096:2160 (1.9:1 = 1.896) - proxy at 1024:540
#   UHD(4K) = 3840:2160 (16:9 = 1.777) - proxy at 720p
#   1080p = 1920:1080 (16:9 = 1.777) - proxy at 720p
#   720p = 1280:720 (16:9 = 1.777)
#
# proxy aspects:
#    1024x540 = 1.9:1
#    1280x720 = 16:9
#    1536x790 = ???  (1.944)


outputres="768:432"

# EXPLANATION
# ===========
#
#   pv = pipeview, shows progress and estimated time
#
#   -v warning  turn down verbosity to only warnings
#
#   -noautorotate do not autorotate videos according to metadata. Helps to keep the video clips upside up in resolve
#
#   -profile:v N
#     where N = 0 -> proxy  1 -> lt  2 -> std  3 -> hq
#
#


fileCount=$(ls -lR "$inputFolder"/*.mov | wc -l)
# Get rid of whitespaces
fileCount=$(echo "$fileCount" | xargs)
i=1
cd "$inputFolder"
for inputfile in *.mov;
do
  filename="${inputfile%.*}"
  ext="${inputfile##*.}"
  outputfile="Proxies/${filename}.${ext}" 

  echo "Generating $i/$fileCount: $inputfile"
  ffmpeg \
    -loglevel warning \
    -noautorotate \
    -i "$inputfile" \
    -filter_complex "scale=$outputres" \
    -codec:a copy \
    -codec:v prores \
    -profile:v 0 \
    $outputfile
  ((i=i+1))
done