MPEG (Moving Picture Experts Group) ndi banja la makanema ndi makanema ophatikizika omwe amagwiritsidwa ntchito kwambiri posungira mavidiyo ndi kusewera.
Ntchito Zofala
Video distribution
Broadcast media
DVD video
MPEG Mafunso Ofunsidwa Kawirikawiri Okhudza Kusintha kwa Anthu
Kodi ndi MPEG kanema wapamwamba?
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MPEG ndi video chidebe kuti ali ndi imodzi kapena zambiri video ma streams, audio nyimbo, ndi optional subtitle. Zosiyana chidebe kugwirizana zosiyanasiyana codecs, kotero kugwirizana zimadalira onse wrapper ndi zimene zili m'gulu lake.
Kodi ndi MPEG pulogalamu mtsinje, ndi chifukwa chiyani ndi wanga fayilo imodzi?
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Ndi multiplex yopangidwa kuti ikhale yosinthidwa ndi zida zamagetsi zamagetsi zamagetsi, sizosinthidwa pakompyuta. Mapaketi a audio ndi video amaphatikizidwa ndi ma markers a nthawi kuti set-top box ikhoza kusewera kuchokera kulikonse m'madzi, popanda index ndi popanda kusungira fayilo yonse. Chithunzicho ndichifukwa chake MPEG zolemba zimasewera pa zida zakale mosasamala kanthu komanso zimasokoneza mapulogalamu amakono nthawi zonse. Video ndi MPEG-1 kapena MPEG-2 ndi MP2 kapena AC-3 Audio, multiplexed mu mtsinje wopangidwa kuti ayambe kusinthidwa ndi fixed-function hardware.
Nchifukwa chiyani pulogalamu yofalitsa ndi yolemba ima insist pa MPEG?
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Chifukwa cha zonse mzere anapangidwa pa izo. Playout ma seva, DVD authoring zipangizo ndi ingest machitidwe anafotokozedwa m'munsimu format pamene izo zinali zatsopano, ndi zida ndi zaka makumi awiri ntchito moyo sitimalandira re-anafotokozedwa. Fayilo kutuluka mwa iwo machitidwe ndi format dongosolo anapangidwa kuti emit, si kusankha aliyense anachita posachedwapa. MPEG pulogalamu ma streams ndi decoded ndi literally aliyense DVD wosewera mpira, set-top bokosi ndi kufalitsa mzere kale anamanga, ndipo iwo kulola bit zoipa graciously.
Kodi MPEG ndi mtundu umodzi monga momwe zimakhalira?
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Yes.
Nchifukwa chiyani msakatuli wanga sadzasewera fayilo ya MPEG?
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Mawebusayiti amatumiza decoders kwa mndandanda wocheperako wa mafomu, ndipo MPEG siyipatsidwa - lisensi, mtundu wa codec womwe umalola, kapena nthawi yake imatenga. Fayilo siyimawonongeka ndipo wosewera wa desktop adzatsegula, koma palibe chomwe mungachite patsambalo kuti mupange msakatuli. Kusintha kwa webusaitiyi ndi njira yokha yotsimikizika yosewera. MPEG-2 amafuna pafupifupi 4 mpaka 6 nthawi ya bitrate ya H.264 kwa chithunzi chimodzi, ndipo zinthu zake nthawi zambiri zimaphatikizidwa, zomwe zimawoneka zosapanga dzimbiri pazowonera zamakono.
Nchifukwa chiyani mavidiyo anga a MPEG amasonyeza makompyuta a comb pa chilichonse chomwe chimayenda?
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Chifukwa chake ndi interlaced. Zolemba mu mtunduwu nthawi zambiri zimachokera ku broadcast ndi DVD era, komwe chilichonse chimasunga ngati madera awiri a half-height omwe amatenga gawo la 50 la theka la mphindi. Progressive screen ikuwonetsa zonse ziwiri pamodzi, kotero kuyendetsa pakati pa ma exposition awiri amawoneka ngati kukongoletsa kwa horizontal. Deinterlacing pa kusintha kumapanga madera kukhala ma frame onse ndipo artefact imatha kutuluka bwinobwino. MPEG pano kumatanthauza MPEG-1 kapena MPEG-2 pulogalamu mtsinje, mtundu standardized kwa Video CD ndi kenako kwa DVD ndi kufalitsa TV.
Kodi MPEG idzasewera pafoni kapena TV popanda kutulutsa batri?
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Nthawi zambiri ndi choncho, chifukwa ma chips mu mafoni, ma tablet ndi ma televisions amachotsa ma code a ma payloads amtunduwu m’ma silicon osankhidwa osati pa main processor. Izi ndi zosiyana pakati pa kanema womwe umasewera bwino kwa maola awiri ndi wina amene umatentha chipangizocho ndipo umachisiya m’maola asanu ndi awiri. Pamene mtunduwo umagwa pansi ndi kuthandizira kwa app kuposa kuchotsa ma code – codec ndi bwino, wrapper ndi zomwe gallery app ingakane.
Kupatulapo ngati zinthu zina zimafuna kuti zichotsedwe. Formatiyo imangotsegula, ndipo palibe vuto la kusintha archive yomwe siyikuyambitsa mavuto, koma sikuti ndi komweko kumene ma tool kapena efficiencies akuyenda. Kwa chilichonse chokhudzana ndi zinthu zatsopano, formati yatsopano siyimawononga ndalama zowonjezera ndipo imateteza ku mafunso ena a zaka zingapo zapitazo.
N'chifukwa chiyani atembenuke MPEG kuti wina video mtundu?
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Kusintha MPEG kuti MP4 pamene mukufuna universal playback - webusaiti owerenga, zipangizo zamakono, smart TV ndi kusintha mapulogalamu onse kusewera MP4 natively. Kusintha kwa WebM kwa webusaiti embedding pamene ochepa wapamwamba kukula zinthu. Kusintha kwa MOV pamene ntchito mu Final Cut kapena ena Apple-native ma pipelines.
Kodi MPEG kusintha re-encode kanema?
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Ngati codec yochokera m’mavidiyo a MPEG ndi yogwirizana ndi mavidiyo a m’mavidiyo ena, titha kuwonjezera mavidiyowa popanda kuwonjezera ma codec ena (m’mavidiyo a H.264, HEVC, ndi ena) ndipo titha kuwonjezera ma codec ena (m’mavidiyo a MPEG-4, MPEG-3, ndi ena) popanda kuwonjezera ma codec ena.
