Tomas Chlebek M'mbuyomu masiku angapo Netflix potsiriza yalola kutsitsa zinthu kuti ziziwoneka popanda intaneti. Chimodzi mwazifukwa zazikulu zomwe njira iyi idabwera yokhayo idanenedwa kuti ndizovuta kupeza mtundu wabwino komanso mtundu.
Magawo awiri apamwamba amaperekedwa kuti atsitsidwe - "Standard" ndi "Wapamwamba". Sizikudziwika kuti ndi zotani zenizeni ndi ma bitrate omwe ali nawo, zomwe zimachitika chifukwa chosiyana malinga ndi zomwe zili. Netflix inkafuna kupereka chiŵerengero chabwino kwambiri pakati pa mtundu ndi kukula kwa fayilo yotsitsa.
Zotsatira zake zimakhala zabwino kwambiri pakukula kochepa
Wakhala akugwiritsa ntchito kusuntha kwa data kwanthawi yayitali, koma adafuna kupeza njira yotsika mtengo yotsitsa. Choncho, pamene kukhamukira kwagwiritsidwa ntchito mpaka pano H.264/AVC Main profile (AVCMain) codec (mtundu wa compression data), Netflix for mobile yayambitsa chithandizo kwa ena awiri - H.264 / AVC High profile (AVCi) ndi VP9, yoyamba ikugwiritsidwa ntchito ndi zida za iOS ndi chipangizo chachiwiri cha Android.
VP9 ili bwino potengera chiŵerengero pakati pa khalidwe ndi chiwerengero cha deta; koma ngakhale ilipo kwaulere, Apple sichigwirizana ndi codec iyi yopangidwa ndi Google, ndipo sizikuwoneka ngati izi zisintha posachedwa. Ichi ndichifukwa chake Netflix adasankha AVHi. Anaganiza zogwiritsa ntchito njira yatsopano yopondereza deta. Izi zimakhala ndi kusanthula zochitika zapayekha ndikuzindikira zovuta zazithunzi zake (mwachitsanzo, mawonekedwe abata osasunthika pang'ono poyerekeza ndi zochitika zokhala ndi zinthu zambiri zoyenda).
Malinga ndi iye, filimuyo / mndandanda wonsewo "umadulidwa" m'zigawo zapakati pa mphindi imodzi ndi zitatu muutali, ndipo pagawo lililonse chigamulo ndi kayendedwe ka deta kofunikira kuti mukwaniritse zofunikira zimawerengedwa payekha. Njirayi idagwiritsidwanso ntchito pa VP9 codec, ndipo Netflix ikukonzekera kuigwiritsa ntchito ku library yake yonse ndikuigwiritsa ntchito osati kungotsitsa, komanso kukhamukira.
Ma codec osiyanasiyana ndi njira zoponderezera zimakhala ndi zotsatira ziwiri: kuchepetsa kusuntha kwa deta pamene mukusunga khalidwe lapachiyambi, kapena kuonjezera khalidwe pamene mukusunga deta yofanana. Mwachindunji, owona ndi moona yemweyo fano khalidwe angafune 19% zochepa danga ndi AVChi codec ndi mpaka 35,9% danga zochepa ndi VP9 codec. Kanema wamakanema wokhala ndi mayendedwe amtundu womwewo (post pa Netflix blog imapereka chitsanzo cha 1 Mb/s) poyerekeza ndi AVCMain yawonjezeka ndi 7 mfundo za AVCHi molingana ndi mayeso Chithunzi cha VMAF, ndi VP9 kenako ndi 10 points. "Kuwonjezeka uku kumapereka chithunzithunzi chabwinoko chosinthira mafoni," ikutero blog.
