Resolves #6 動画の先頭からカットするとpart1のファイルが作られなくてエラーになるのを修正 #15
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ファイルの開始地点から最初のマーカーの開始位置までを採用しようとしていた。
でも、最初のマーカーがファイルの先頭を指していると、最初から最初という謎コマンドを生成してしまって出力に失敗していた。
最初のマーカーがファイルの先頭を指していたらスキップするように下。