Diff of cpp-mp4

• The added line is THIS COLOR.
• The deleted line is THIS COLOR.
• Go to cpp-mp4.

[[MP4]]

- https://github.com/shiguredo/cpp-mp4

- [https://voluntas.medium.com/shiguredo-cpp-mp4-%E3%82%92%E5%85%AC%E9%96%8B%E3%81%97%E3%81%BE%E3%81%97%E3%81%9F-f851c9732fdd https://voluntas.medium.com/shiguredo/cpp-mp4 を公開しました]