AVI Amathuluzi

Ngenxa yokuthi idlulele ngamashumi amabili. AVI iyifayela le-RIFF chunk: ukulandelana okuqinile kwe-audio nevidiyo exhunywe nge-index exhunywe ekugcineni. Akukho mibono ye-frame rate eshintshayo, akukho indawo yokubeka umsindo wesihloko, futhi i-index iyisizathu sokuthi ifayela elicushiwe lizohlala lingazithola ngaso sonke isikhathi. Konke okubi mayelana nefomethi libuyela emuva kulolu hlelo. AVI Microsoft Audio Video Interleave, isungulwe ngo-1992 phezu RIFF chunk format - eyodwa yezinto eziphilayo ezidala kakhulu okwamanje e circulation. I-AVI ayinaso isixhaso esisemthethweni se-codecs yamanje, isilinganiso sefreyimu esiguqukayo, izihloko ezithambile noma amafayela angaphezu kuka-4 GB ngaphandle kokuhlaselwa, futhi i-chunk ngayinye i-overhead ibhoboza ifayela.

Ngenxa yokuthi ifomu lilula ngokwanele ukubhalela ngesikhathi sangempela ku-hardware encane, futhi ngenxa yokuthi umndeni wezinto zokuqapha ukhishwe ngaso futhi awunakubuyekezwa. Idivayisi ayisebenzisi ukuhlolwa kokhwalithi, ibhala lokho i-firmware yayo ikwazi. Lokhu futhi kusho ukuthi kungani lezi fayela zikhulu ngento equkethwe kuzo nokuthi kungani ukushintshana kuzo kuyinto yokuqala umuntu oyenzayo.

Amabhuleki athumela ama-decoders kuluhlu oluncane lwefomethi, futhi AVI ayikho kulo — ilayisense, i-codec ehlukene evumela, noma nje ubudala bayo bugcina bungaphandle. Ihele alilahlekile futhi umdlali wedesktop uzovula, kodwa akukho okwenziwayo kukhasi kuzokwenza ibhuleki liyibonise. Ukushintsha ukuguqula kube nendawo yokugcinwa ye-web-native kuyindlela ethembekile kuphela yokudlala ngaphakathi.

Ngenxa yokuthi i-interlaced. Izinto ezingaphakathi kulolu hlobo zivela emidlalweni ye-DVD, lapho ifreyimu ngayinye igcinwa njengezindawo ezimbili ezingu-half-height ezithathwe ngengxenye engu-50 yesikhathi. Isikrini esiqhubekayo sibonisa zombili ngasikhathi sinye, ngakho-ke ukuhamba phakathi kwezimo ezimbili kubukeka sengathi kuzoba kuphindwe kabili. Ukususa i-interlacing kushintsho kuveza izimo zibe amafreyimu aphelele futhi i-artefact iphela.

I-format-level ceiling, hhayi iphutha ku-recorder. AVI ine-file-single-limit esebenzayo esebenza kahle ehamba phambili noma i-bitrate-high material, ngakho-ke isofthiwe yokuqapha ihlukanise ukurekhodwa ngaphezu kokukhishwa kwefayela alikwazi ukulibonisa. Ukudlulisa ku-container ngaphandle komkhawulo onjalo kwenza ama-pieces aphinde axhunywe kuvidiyo eyodwa eqhubekayo, okuvame ukuba yisizathu esingokoqobo abantu abaguqula le-format.

Ngenxa yokuthi i-software ifakazela. Ama-hardware video decoders afakazela kuphela uhlu oluqinile lwefomethi, futhi AVI ungaphandle kwayo kumadivayisi amaningi, ngakho-ke yonke ifreyimu ivuselelwa yi-CPU endaweni. Kudesktop yamanje elahlekile; ku-smartphone, i-laptop edala noma i-smart TV ivela njengefreyimu elahlekile, umsindo we-fan nebhethri eliphumayo. Ukudlulisa ku-hardware-supported format isusa izinkinga zonke. Amafayela we-AVI adlule ama-codecs amanje: cabanga i-MPEG-4 Part 2 (DivX/Xvid), Motion JPEG noma amafreyimu amnyama angacindezelwa ngaphandle kwe-H.264.

Uma nje kukhona okuthile okudingayo. Ifomethi ivuliwe, futhi akukho sidingo sokushintsha ingobo yomlando ongeke ukwenze kube nzima, kodwa akuyona indawo lapho ithuluzi noma umphumela uhamba khona. Kunoma yini entsha, ifomethi yamanje ayidingi lutho olungeziwe futhi ivimbela ukulandelana kwesifundo seminyaka eminingana kusukela manje.

Gcina AVI MP4 uma ufuna ukulalela jikelele - amabhuleki web, amadivayisi mobile, smart TVs kanye nokuhlela amathuluzi wonke adlala MP4 natively. Gcina WebM for web embedding lapho ncane ifile ubukhulu izinto. Gcina MOV uma usebenza Final Cut noma ezinye Apple-native pipelines.

Uma umsuka codec ngaphakathi AVI ihambisana nenjongo ibhokisi si remux ngaphandle kabusha-encoding (fast, lossless). Uma codec kufanele ushintshe (umzekelo HEVC to H.264) ividiyo is re-encoded — slower, nge umkhawulo oncane ukukhiqizwa quality izindleko.