MPG → FLV

Idzachitika ngati simukusintha, ndipo MPG zolemba nthawi zambiri zimasinthidwa chifukwa mtunduwo umachokera kunthawi ya mafilimu ndi DVD. Ma frame ophatikizidwa amasunga madera awiri apakati omwe amatenga masentimita asanu ndi awiri; pafoni kapena monitor ya progressive-scan yomwe imawerenga ngati chotchinga chozungulira pa chilichonse chomwe chimayenda. Ikani njira yosinthira ndipo encoder imapanga madera onse m'ma frame opitilira muyeso pambuyo polemba FLV. MPG ndi chimodzimodzi MPEG pulogalamu mtsinje monga.mpeg - atatu-alemba kuwonjezeka ndi DOS-era kugwa, si mtundu wina.

Sizotsimikizika. MPG imasunga ma audio ambiri monga ma tracks achiwiri, koma FLV kusewera kuthandizira pambuyo pa gawo loyamba ndilopanda malire, kotero ambiri osewera adzawonetsa imodzi. Sankhani gawo lomwe mukufuna poyamba; ena amaphunzitsidwa bwino ku mafayilo awo oyambirira kuposa kuchoka m'chipinda chokhala ndi ma CD omwe amawateteza. MPG ndi kuwonjezeka DVD authoring mapulogalamu, older camcorders ndi kufalitsa ingest zipangizo kuzindikira, kotero kuti imakhala zothandiza kwa iwo ma pipelines. No msakatuli watsopano, foni kapena TV angagwiritse ntchito FLV - chilichonse choterobe mu bokosi lachitsulo ayenera kunyamula kunja kwa izo kuti azikhala watchable.

Sichingakhale choncho. MPG imasinthidwa ndi silicon yoperekedwa pafoni, ma tablet ndi ma TV, chifukwa chake imasewera popanda kutulutsa batri. FLV nthawi zambiri imabwerera ku decoding ya mapulogalamu pa hardware yomweyo - kulemera kwa CPU, chipangizo chotentha, ndi ma frame osunthika pa 4K. Kwa chipangizo chofunikira, MPG ndi chotetezeka chokhalamo.

Idzalowetsedwa ku stereo, chifukwa FLV siyimakhala ndi njira yodalirika ya multichannel. Kulowetsedwa kumagwiritsa ntchito ITU standard coefficients kuti mauthenga m'malo ozungulira azitha kumvetsedwa bwino ndipo ma surrounds amafika pamalo otsika kuposa kugwa. Chomwecho chilichonse chomwe chimadalirika pa malo osiyana a ma channels chimapita pambuyo pake.

Ngati chinthu chokhacho cha zida chikufunikira kukwaniritsa zolingazo. Mafomu awiriwa amachokera kunthawi yomweyo ya H.264, kotero palibe kusintha komwe kumagula chitetezo, kudalirika kapena kutsimikizika kwatsogolo - kumagula kugwirizana ndi chipangizo chimodzi chokha. Ngati cholinga ndicho kuteteza zithunzi zogwiritsa ntchito nthawi yayitali, kusintha kwa kontena latsopano, osati kumbuyo. MPG amalandira zonse MPEG-2 kuletsa - heavy bitrate, interlacing, palibe soft subtitle - kuphatikizapo kusokonezeka kwa awiri zowonjezera kwa mtundu wina.

Ndikoyenera - zonse zolemba za audio mu MPG (kuwunika kwa woyang'anira, mabungwe osiyanasiyana, mawu ofotokoza) amasungidwa mu FLV pamene chikwama chofunikira chimathandizira ma audio ambiri. MKV ndi MOV amayendetsa ma audio osatha; MP4 amathandizira ambiri koma ena osewera a hardware amawona kokha track 1; WebM imatha pa Opus / Vorbis track. FLV ndi Flash Video Container yomwe idabweretsa zonse zomwe zili pa intaneti kuchokera pa 2003 mpaka pomwe Flash idalephera pamapeto pa 2020.

Ma subtitle olimba (ma tracks osankhika) amapulumuka pamene FLV angawagwiritse ntchito: MKV amagwiritsa ntchito SRT, ASS, SSA, PGS, VobSub mwachilengedwe; MP4 amagwiritsa ntchito mov_text (format yosasinthasintha). Kusintha MKV ndi subs a ASS ku MP4 kumawawononga kuti akhale mov_text kapena kuwalemba. Hardsubs (olembana mu kanema) amagwiritsa ntchito ngakhale.

Metadata ya bokosi limasintha pakati pa MPG ndi FLV pamenepo onse awiri amapereka bokosi la atomu (MKV, MP4, MOV). WebM imasunga bokosi m'ma block ogwirizana ndi Matroska, choncho MKV <-> WebM bokosi limayenda molimba. AVI sichimakhala ndi bokosi la spec, choncho kusintha kwa AVI ku FLV kumabweretsa fayilo yosasinthika ngati simuwonjezera ma markers m'manja.

MKV ndi yokha mainstream yokhala ndi ma fayilo ophatikizidwa (TTF fonts for ASS subs, JPG cover art, fan-translated PDF inserts). Kuchokera ku MPG kupita ku FLV kumachotsa ma attachments pamene FLV si MKV - ma streams elementary amasinthidwa, koma payload ophatikizidwa amakhala m'malo ochokera. Tengani MPG ngati chitetezo ngati mumatengera ma fonts ophatikizidwa.

Kodiyi ya default imasankhidwa kuti igwirizane ndi FLV yokhala ndi katundu: MKV imasinthidwa kukhala H.265 (HEVC) kuti ikhale yolimba kwambiri; MP4 imasinthidwa kukhala H.264 kuti ikhale yolimba kwambiri; WebM imasinthidwa kukhala VP9; AVI imagwiritsa ntchito MPEG-4 ASP (DivX / Xvid linage). FLV ya pansi pa-packet overhead anachititsa izo zabwino pa streaming pa unreliable kugwirizana wa nthawi yake, ndi mabuku akuluakulu a izobe zilipo.

HDR static metadata (HDR10 mastering display values, max content light level) imatha kupita ku FLV pamene ma kontena awiri ndi codec osankhidwa amathandizira (HEVC, AV1 mu MKV / MP4). Dolby Vision ndi wolimba kwambiri - DV profile 5 / 7 / 8.1 mu MPG nthawi zambiri amapulumuka okha ku MKV ndi HEVC; kusinthidwa ku FLV kontena lomwe silitha kunyamula gawo la DV limatha ku HDR10.