Automate compressing of video files from GoPro

concat.sh

#!/usr/bin/env bash

# USAGE: concat.sh files...
#        curl https://gist.githubusercontent.com/miry/02ce08a78a217c887e103897c7759eed/raw/concat.sh | bash -s -- files...
# Reerences: https://trac.ffmpeg.org/wiki/Concatenate
#
# Example:
#    curl https://gist.githubusercontent.com/miry/02ce08a78a217c887e103897c7759eed/raw/concat.sh | bash -s -- GH0*0172.MP4

set -euxo pipefail

files=$@

: Create a file config for ffmpeg
listfile="_concat.txt"
[ -f ${listfile} ] && rm ${listfile}

lastfile=""
for file in $files ; do
  if [ ! -e "$file" ]; then
    echo "Video files not found"
    exit
  fi
  echo "file '${file}'" >> "${listfile}"
  lastfile="${file}"
done

if [ -z "${lastfile}" ]; then
  echo "No video files provided"
  exit
fi

name=$(basename "${lastfile%.*}")
output="${name}_concat.MP4"
ffmpeg -safe 0  -nostdin -f concat -i "${listfile}" -c copy "${output}"
touch -r "${lastfile}" "${output}"

convert.sh

#!/usr/bin/env bash

# USAGE: conver.sh [codec]
#        curl https://gist.githubusercontent.com/miry/02ce08a78a217c887e103897c7759eed/raw/convert.sh | bash -s -- libx265

set -euxo pipefail

codec=${1:-libx264}

: Remove thumbnails files
[ -f *.THM ] && rm *.THM
[ -f *.LRV ] && rm *.LRV

: Ensure there is an output folder
output_dir="processed"
mkdir -p "${output_dir}"

for file in *.MP4 ; do
  if [ ! -e "$file" ]; then
    echo "Video files not found"
    break
  fi
  
  output="${output_dir}/${file}"
  if [ -f "$output" ]; then
    echo "skipping. $output exists."
    continue
  fi
  ffmpeg -nostdin -i $file -threads 0 -vcodec $codec $output
  touch -r $file $output
done

MOVIE COMPRESSION.md

FFMPEG

Limiting the output bitrate

LBRY.TV

How do I publish content to LBRY?

Convert to 720p with 5M bitrate:

$ ffmpeg -i input.mp4 -vf scale=-1:720 -b:v 5M -maxrate 5M -bufsize 100M output.mp4

TWITCH

Encodings

update_metadata_information.rb

Dir["*.MP4"].each do |f|
  puts "Process: #{f}"
  if f.include?("_concat.") || f.include?("_metadata.mp4")
    puts "  > Skip, the filename: #{f}"
    next
  end
  fs = File::Stat.new(f)
  
  `ffmpeg -dump -i "#{f}"`  
  new_time = fs.ctime.utc.strftime("%FT%T.%L000Z")
  output = File.basename(f)
  puts output
  `ffmpeg -safe 0 -i "#{f}" -c copy -movflags use_metadata_tags -metadata creation_time="#{new_time}" "#{output}"`
  FileUtils.touch "#{output}", mtime: fs.ctime
end

update_time.rb

require 'fileutils'

# GOPRO uses wrong date and time. I identified close time +- 4 hours.
# Update ctime, atime and mtime for all files.
# Skip files that were created manually.
# Difference real time and when it was created
diff=208372731

Dir["*.{MP4,JPG}"].each do |f|
  puts "Process: #{f}"
  if f.include?("_concat.")
    puts "  > Skip, the filename concat: #{f}"
    next
  end
  fs = File::Stat.new(f)
  p fs
  if fs.mtime.year < 2022
    new_time = fs.mtime + diff
    puts new_time
    # TODO: Uncomment next line after checking
    # FileUtils.touch f, mtime: new_time
  else
    puts "  > Skip, the mtime: #{fs.mtime}"
  end
end