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Pythonでmp4の動画から音声のみを抽出したmp3ファイルを作成する

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前提

  • mp4の動画から音声のみを抽出したmp3ファイルを作成したい
  • 今回はffmpeg-pythonライブラリを使います
  • mp4ファイルはBytesIOの形式で渡されるものとします

実装

import tempfile
import ffmpeg
from io imoprt BytesIO

def convert_to_mp3_from_mp4(file: BytesIO)

    # ffmpegのinputはファイル形式しか受け付けないためtempfileで一時ファイルを作成します
    with tempfile.NamedTemporaryFile() as temp_file:
        temp_file.write(file.getvalue())
        # mp3に変換します
        (
            ffmpeg
            .input(temp_file.name)
            .output("output.mp3")
            .run()
        )

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