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mp4-py

About Shiguredo's open source software

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Please read https://github.com/shiguredo/oss/blob/master/README.en.md before use.

時雨堂のオープンソースソフトウェアについて

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mp4-py について

mp4-rust の Python バインディングです。 MP4 コンテナフォーマットの読み書きをサポートしています。

対応プラットフォーム

macOS 26 arm64
macOS 15 arm64
Ubuntu 24.04 x86_64 (manylinux2014 wheel は glibc 2.17+ 対応)
Ubuntu 24.04 arm64 (manylinux2014 wheel は glibc 2.17+ 対応)
Windows Server 2025 x86_64
Windows 11 x86_64

対応 Python

3.14 (abi3 wheel: 3.12/3.13/3.14 共通)
3.14t (Free-Threading, 専用 wheel)
3.13 (abi3 wheel)
3.12 (abi3 wheel)

インストール

uv add mp4-py

使い方（基本 API）

Mp4FileDemuxer / Mp4FileMuxer
ビデオ/オーディオ/字幕トラックの読み書きをサポート
Opus / AAC / FLAC 音声コーデック対応
VP8 / VP9 / AV1 / H.264 / H.265 映像コーデック対応
STPP (XML 字幕) / WVTT (WebVTT 字幕) / TX3G (3GPP タイムドテキスト) 対応
Python Free Threading 対応

MP4 ファイルの読み込み

import io
from mp4 import Mp4FileDemuxer

# ファイルパスから demuxer を作成
with Mp4FileDemuxer("input.mp4") as demuxer:
    # サンプルを走査して処理
    for sample in demuxer:
        print(f"Sample: {sample.timestamp_seconds}s, keyframe={sample.keyframe}")
        print(f"Data size: {len(sample.data)} bytes")

# バイナリストリームから demuxer を作成
with open("input.mp4", "rb") as fp:
    demuxer = Mp4FileDemuxer(fp)
    for sample in demuxer:
        # サンプルを処理...
        pass

MP4 ファイルの作成

import io
from mp4 import (
    Mp4FileMuxer,
    Mp4MuxSample,
    Mp4SampleEntryVp08,
)


# ファイルにマルチプレックス
with Mp4FileMuxer("output.mp4") as muxer:
    # VP8 ビデオサンプルエントリーを作成
    video_entry = Mp4SampleEntryVp08(
        width=1920,
        height=1080,
    )

    # フレームを追加
    for i in range(30):
        is_keyframe = (i % 10) == 0  # 10フレームごとにキーフレーム

        # ビデオデータ（実際のエンコード済みデータに置き換えてください）
        video_data = b'\x00' * 1000

        # サンプルを作成して追加
        sample = Mp4MuxSample(
            track_kind="video",
            sample_entry=video_entry,
            keyframe=is_keyframe,
            timescale=30,
            duration=1,
            data=video_data,
        )
        muxer.append_sample(sample)

    # finalize() を呼んでファイルを完成させる（自動的に呼ばれるが明示的に呼ぶこともできます）

# バイナリストリームにマルチプレックス
with open("output.mp4", "wb") as fp:
    with Mp4FileMuxer(fp) as muxer:
        # マルチプレックス処理...
        pass

トラック情報の取得

from mp4 import Mp4FileDemuxer

with Mp4FileDemuxer("input.mp4") as demuxer:
    for track in demuxer.tracks:
        print(f"Track ID: {track.track_id}")
        print(f"Kind: {track.kind}")  # 'video' / 'audio' / 'subtitle'
        print(f"Duration: {track.duration_seconds:.2f}s")

[!WARNING]

現在は基本的な読み書き機能をサポートしています

マルチプレックス時は最初のサンプルで sample_entry を必須で指定してください

同じトラック内で同じコーデック設定が続く場合、sample_entry に None を指定できます

サンプル

examples/demux.py: MP4 ファイルをデマルチプレックスしてトラックとサンプル情報を表示
examples/remux.py: MP4 ファイルをリマルチプレックス（読み込んで別ファイルに書き込む）

実行例:

uv run python examples/demux.py input.mp4
uv run python examples/remux.py input.mp4 output.mp4

開発ビルド

# maturin をインストール
uv pip install maturin

# 開発ビルド (editable install)
maturin develop --release

# wheel を生成
maturin build --release --out wheelhouse --generate-stubs

# テスト
uv pip install pytest pytest-timeout hypothesis
uv run pytest tests/ --timeout=30

Rust 側は crates.io の shiguredo_mp4 を通常の cargo 依存として参照している (Cargo.toml を参照)。

mp4-rust ライセンス

Apache License 2.0

Copyright 2024-2026, Takeru Ohta (Original Author)
Copyright 2024-2026, Shiguredo Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

mp4-py ライセンス

Apache License 2.0

Copyright 2025 Takeru Ohta (Original Author)
Copyright 2025 Shiguredo Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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2026.2.0.dev2 pre-release

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mp4-py 2026.2.0.dev2

mp4-py

About Shiguredo's open source software

時雨堂のオープンソースソフトウェアについて

mp4-py について

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対応 Python

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MP4 ファイルの読み込み

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