MPEG-4 Part 14
| MPEG-4 Part 14 (MP4) | |
|---|---|
| MPEG-4 Part 14 kak rasshirenie ISO Base Media File Format (MPEG-4 Part 12). | |
| Rasshirenie |
.mp4 |
| MIME-tip | video/mp4, audio/mp4, application/mp4 |
| Razrabotchik | ISO |
| Tip formata | container |
| Soderzhit | Audio, video i tekst. |
| Rasshiren iz | MPEG-4 Part 12 |
| Standart(y) | ISO/IEC 14496-14 |
MPEG-4 Part 14 ili MP4, ofitsial'no izvestnyi kak ISO/IEC 14496-14:2003, -- format mediakonteinera, iavliaiushchiisia chast'iu standarta MPEG-4. Ispol'zuetsia dlia upakovki tsifrovykh video- i audiopotokov, subtitrov, afish i metadannykh, kotorye opredeleny gruppoi spetsialistov MPEG. Kak i bol'shinstvo sovremennykh mediakonteinerov, MPEG-4 Part 14 predusmatrivaet vozmozhnost' pokaza video cherez Internet, dopolnitel'no k failu peredaiutsia metadannye, soderzhashchie neobkhodimuiu dlia veshchaniia informatsiiu. Konteiner pozvoliaet upakovyvat' neskol'ko video- audiopotokov, a takzhe subtitrov[1][2][3][4][5].
Formaty dannykh
[pravit' | pravit' kod]Konteiner MPEG-4 Part 14 podderzhivaet sleduiushchie formaty dannykh:
- Videopotoki: H.264/MPEG-4 Part 10, MPEG-H Part 2 (H.265/HEVC), VP9, AV1, MPEG-4 Part 2, H.262/MPEG-2 Part 2, H.261/MPEG-1 Part 2.
- Audiopotoki: MPEG-4 Part 3, MPEG-2 Part 7, MPEG-1 Audio Layer III, MPEG-1 Audio Layer II, MPEG-1 Audio Layer I, FLAC, Opus.
- Subtitry: MPEG-4 Part 17.
- Statichnye izobrazheniia: JPEG, PNG.
V nastoiashchee vremia naibol'shee primenenie poluchila sviazka iz H.264/MPEG-4 Part 10 i Advanced Audio Coding, tak kak bol'shinstvo pleerov imeet apparatnye vozmozhnosti dekodirovaniia etikh potokov.
Neofitsial'nye rasshireniia
[pravit' | pravit' kod]Kompaniia Apple aktivno ispol'zuet konteiner MP4, no ispol'zuet sobstvennye, ne predusmotrennye standartom, rasshireniia faila:
- .m4a -- audiofail, soderzhashchii potok v formate AAC ili ALAC. Mozhet byt' pereimenovan v .mp4;
- .m4v -- fail soderzhashchii audio- i videopotoki. Mozhet byt' pereimenovan v .mp4;
- .m4b -- fail AAC, podderzhivaiushchii zakladki. Ispol'zuetsia dlia audioknig i podkastov, ispol'zuetsia v onlain-magazinakh, podobnykh Apple iTunes Store;
- .m4p -- zashchishchionnyi fail AAC. Ispol'zuetsia dlia zashchity faila ot kopirovaniia pri legal'noi zagruzke sobstvennicheskoi muzyki v onlain-magazinakh, podobnykh Apple iTunes Store;
- .m4r -- fail ringtona ispol'zuemyi v Apple iOS.
Metadannye
[pravit' | pravit' kod]Faily MP4 mogut soderzhat' metadannye, opredelionnye standartom, takie kak: vremia sozdaniia faila, prodolzhitel'nost', iazykovyi kod potoka, nazvanie al'boma, pravovoi status proizvedeniia i t. p. Takzhe mogut soderzhat' XMP (Extensible Metadata Platform) metadannye.
Sm. takzhe
[pravit' | pravit' kod]Primechaniia
[pravit' | pravit' kod]- | mp4ra.org - MP4 Registration authority. References, MPEG-4 Registration authority . Arkhivirovano 26 avgusta 2012 goda.
- | ISO. ISO Base Media File Format white paper - Proposal. -- archive.org, 2006. -- Aprel'. Arkhivirovano 14 iiulia 2008 goda.
- | ISO. MPEG-4 File Formats white paper - Proposal. -- archive.org, 2005. -- Oktiabr'. Arkhivirovano 15 ianvaria 2008 goda.
- | ISO. ISO Base Media File Format white paper - Proposal. -- chiariglione.org, 2009. -- Oktiabr'. Arkhivirovano 29 aprelia 2021 goda.
- | Apple Computer. MPEG-4 Fact Sheet . Arkhivirovano 26 avgusta 2012 goda.
Ssylki
[pravit' | pravit' kod]- The MP4 registration authority
- RFC 4337 - MIME Type Registration for MPEG-4