make Proxies for video cutting in Davinci Resolve

make_proxies.ps1

Param(
  $outdir
)

function Show-Notification {
  [CmdletBinding()]
  Param (
    [string] $Title,
    [string] [parameter(ValueFromPipeline)] $Text
  )

  Add-Type -AssemblyName System.Windows.Forms
  $global:balloon = New-Object System.Windows.Forms.NotifyIcon
  $path = (Get-Process -Id $pid).Path
  $balloon.Icon = [System.Drawing.Icon]::ExtractAssociatedIcon($path)
  $balloon.BalloonTipIcon = [System.Windows.Forms.ToolTipIcon]::Info
  $balloon.BalloonTipTitle = $Title
  $balloon.BalloonTipText = $Text
  $balloon.Visible = $true
  $balloon.ShowBalloonTip(0)
}

Get-ChildItem DJI*_D.MP4 | ForEach-Object {
  if (Test-Path -path ($outdir + "\" + $_.Name)) {
    return
  }

  ffmpeg -y -hide_banner -nostdin `
    -hwaccel dxva2 `
    -i $_.FullName -map 0:v:0 -map 0:a? -map_metadata:s:v "-1" `
    -c:a copy `
    -s "-2:720" -c:v h264_amf -usage "lowlatency_high_quality" -quality speed `
    -tag:v avc1 `
    ($outdir + "\" + $_.Name)
}

Show-Notification "Encoding" "It’s done!"

make_proxies.sh

#!/bin/bash
# Makes proxy videos for cutting.
set -upo pipefail

mkdir -p ProxyItems

declare -i rotation err=0
sources=( DJI*_D.MP4 )
for fname in "${sources[@]}"; do
  if [[ -s "ProxyItems/${fname}" ]]; then continue; fi

  ffmpeg -y -hide_banner -nostdin \
    -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 \
    -i "${fname}" -map 0:v:0 -map "0:a?" -map_metadata:s:v "-1" \
    -c:a copy \
    -c:v h264_vaapi -vf "format=vaapi,scale_vaapi=-2:720:format=nv12" -profile:v high -crf 21 -b: 6400K \
    -tag:v avc1 \
    "ProxyItems/${fname}"
  err=$?

  if [[ -e "ProxyItems/${fname}" && ! -s "ProxyItems/${fname}" ]]; then rm "ProxyItems/${fname}"; fi
  if (( $err > 0 )); then break; fi

  let rotation=0
  if rotation=$(ffprobe -v 0 -select_streams v:0 -show_entries stream_side_data=rotation -of default=nw=1:nk=1 "${fname}") && \
    (( rotation != 0 ))
  then
    exiftool -rotation=$(( -rotation )) -overwrite_original "ProxyItems/${fname}" &
  fi
done

wait
exit $err

ffmpeg for Windows: https://github.com/BtbN/FFmpeg-Builds/releases