[Powershellでffmpeg実行サンプル] #ffmpeg #Powershell

conv.ps1

# ビットレートが半分のh265にエンコードして、.\done\に出力するスクリプト
# NVENC使うのでGeForce系のグラボないとダメ

$items = Get-ChildItem;
Write-Output $lines;

foreach($i in $items){
    if($i.PSIsContainer -or [System.IO.Path]::GetExtension($i) -eq "ps1"){
        continue;
    }
    $name = [System.IO.Path]::GetFileNameWithoutExtension($i);
    $ext = [System.IO.Path]::GetExtension($i)
    $filename = $name + $ext
    $info = ffprobe $filename -hide_banner -show_entries format=bit_rate
    $regex = New-Object regex "bit_rate=(.+)\s\["
    $results = $regex.Matches($info)
    $bitrate = $results[0].Groups[1].Value/2
    $bitrate = [Math]::Truncate($bitrate)
    $bitrate
    $filename
    ffmpeg -i "$i" -vcodec hevc_nvenc -acodec aac -b:a 128k -b:v "$bitrate" ".\done\$name.mp4"
}

losslesscutの編集ファイルから無劣化カット.ps1

$csvs = Get-ChildItem ./csv

foreach($csv in $csvs) {
  $csv_name = $csv.Name
  $video_name = (Get-ChildItem ./ -Filter "$($csv_name.Substring(0, $csv_name.LastIndexOf("."))).*").Name
  $no_ext_name = [System.IO.Path]::GetFileNameWithoutExtension($video_name);
  $ext = [System.IO.Path]::GetExtension($video_name)
  $trim_table = Import-Csv "./csv/$csv_name" -Header 'begin', 'end'
  Write-Host "# start >> $video_name"

  $i = 1
  foreach($section in $trim_table){
    $begin = [double]$section.begin
    $end = [double]$section.end
    if ($begin -eq "") {
      $begin = "0.0"
    }
    if ($end -eq "") {
      $info = ffprobe $video_name -v quiet -hide_banner -show_entries format=duration
      $end = [double](New-Object regex "duration=(.+)\s\[").Matches($info).Groups[1].Value
    }
    $duration = $end-$begin

    Write-Host "## begin: $begin, end: $end, duration: $duration"
    Write-Host "# output: $no_ext_name$i.$ext"
    ffmpeg -ss $begin -i $video_name -ss 0 -t $duration -c:v copy -c:a copy -async 1 "./trimed/$no_ext_name$i.$ext"
    $i++
  }
}

sample.ps1

# 連番のPNGをh264のmp4に変換
ffmpeg -r 29.970 -i "input\%06d.jpg" -vcodec h264_nvenc video.mp4

# 音声だけ無劣化抽出
ffmpeg -i "input.mp4" -vn -acodec copy 'audio.aac'

# 無音動画に音声を結合
ffmpeg -i video.mp4 -i audio.aac -c:v copy -c:a copy output.mp4

# 動画を回転
# transpose=1:90度 時計まわりに回転
# transpose=2:90度 時計反まわりに回転
# transpose=3:90度 時計まわり回転後、上下を反転
# transpose=0:90度 時計反まわり回転後、上下を反転
ffmpeg -i input.mp4 -vf "transpose=1" -crf 26 output.mp4