AVI → FLV

Idzachitika ngati simukusintha, ndipo AVI 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. AVI ndi Microsoft Audio Video Interleave, anayambitsa mu 1992 pamwamba pa RIFF chunk mtundu - imodzi mwa zaka zakale zinyalalabe m'madera.

Sichoncho, ndipo ndi imodzi mwazinthu zabwino kwambiri zosamukira. Konteni ya AVI ili ndi bokosi lokha lokha lomwe limatha kuyendetsa mavidiyo ochepa kapena otsika kwambiri, chifukwa chake makamera oyambirira amafika ngati gawo1, gawo2, gawo3. FLV silimagwirizana, chifukwa chake masamba amatha kuphatikizidwanso mu fayilo imodzi yopitilira. AVI alibe native thandizo kwa codecs zamakono, kusinthasintha framerate, softsubs kapena owona kuposa 4 GB popanda hacks, ndi zake per-chunk overhead bloats fayilo.

Sizotsimikizika. AVI 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. AVI ndi trivially yosavuta, amene ndi chifukwa chake kale camcorders, kusonkhana kagawo, DVD ripping zipangizo ndi Windows-era mapulogalamu onsebebe kutulutsa izo. No msakatuli watsopano, foni kapena TV angagwiritse ntchito FLV - chilichonse choterobe mu bokosi lachitsulo ayenera kunyamula kunja kwa izo kuti azikhala watchable.

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.

Ndikoyenera - zonse zolemba za audio mu AVI (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 AVI 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 AVI kupita ku FLV kumachotsa ma attachments pamene FLV si MKV - ma streams elementary amasinthidwa, koma payload ophatikizidwa amakhala m'malo ochokera. Tengani AVI 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 AVI nthawi zambiri amapulumuka okha ku MKV ndi HEVC; kusinthidwa ku FLV kontena lomwe silitha kunyamula gawo la DV limatha ku HDR10.

MKV ndi WebM amalemba ma timestamps a real-frame ndi kuwongolera VFR mwanjira yachibadwa, kotero kuti AVI VFR imatha kukhala ndi FLV ya mafomuwa popanda kubwezeretsa. MP4 imasunga nthawi yowonjezerapo koma ena osewera amaganiza kuti CFR; wosintha amatulutsa "kulepheretsa CFR" kuti abwezeretse VFR AVI ku 24 / 30 / 60 fps FLV kwa zolinga zosatheka.