MP4 (MPEG-4 Part 14)

MP4는 비디오, 오디오, 자막을 하나의 파일에 담는 가장 인기 있는 멀티미디어 컨테이너입니다. 웹 스트리밍과 모바일 비디오의 사실상 표준입니다.

MIME 타입

text/plain

유형

텍스트

압축

무손실

장점

+ Opens in every text editor on every operating system
+ Zero overhead — file size equals content size
+ No risk of embedded malware or macros
+ Perfect for version control, piping, and scripting

단점

− No formatting, images, or structured data
− Character encoding must be known to display correctly
− Not suitable for documents that need visual presentation

.TXT 사용 시점

MP4(H.264+AAC)는 범용 비디오에 사용하세요. 웹 최적화에는 WebM을, 다중 트랙에는 MKV를 사용하세요.

기술 세부사항

MP4는 ISOBMFF 박스(atom) 구조를 사용합니다. moov(메타데이터), mdat(미디어 데이터), ftyp(형식 식별)가 핵심입니다.

역사

ISO가 2003년 QuickTime MOV를 기반으로 MP4를 표준화했습니다. H.264/H.265와 AAC의 표준 컨테이너가 되었습니다.

.TXT에서 변환

.txt → .csv .txt → .doc .txt → .docx .txt → .epub .txt → .html .txt → .keynote .txt → .md .txt → .mobi .txt → .numbers .txt → .odt .txt → .pages .txt → .pdf .txt → .pptx .txt → .rtf .txt → .tex .txt → .xlsx

.TXT로 변환

.csv → .txt .doc → .txt .docx → .txt .epub → .txt .html → .txt .keynote → .txt .md → .txt .mobi → .txt .numbers → .txt .odt → .txt .pages → .txt .pdf → .txt .pptx → .txt .rtf → .txt .tex → .txt .xlsx → .txt

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