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Kutulutsidwa kwa dav1d 0.7, decoder ya AV1 kuchokera kumapulojekiti a VideoLAN ndi FFmpeg

Magulu a VideoLAN ndi FFmpeg lofalitsidwa kutulutsidwa kwa laibulale ya dav1d 0.7.0 ndikukhazikitsa njira ina yaulere yosungira makanema AV1. Khodi ya polojekitiyi idalembedwa mu C (C99) yokhala ndi zoyikapo (NASM/GAS) ndi wogawidwa ndi pansi pa layisensi ya BSD. Kuthandizira kwa zomangamanga za x86, x86_64, ARMv7 ndi ARMv8, ndi Linux, Windows, macOS, Android ndi iOS opareting'i sisitimu imayendetsedwa.

Laibulale ya dav1d imathandizira zonse za AV1, kuphatikiza zowonera zapamwamba zitsanzo ndi magawo onse owongolera kuya kwamitundu omwe adanenedwa muzofotokozera (8, 10 ndi 12 bits). Laibulale yayesedwa pagulu lalikulu la mafayilo mumtundu wa AV1. Chofunikira chachikulu cha dav1d ndikuyika kwake pakukwaniritsa magwiridwe antchito apamwamba kwambiri ndikuwonetsetsa kuti ntchito zamtundu wapamwamba zimagwira ntchito mwamitundu yambiri.

Π’ Baibulo latsopano:

  • Kuchita kwa refmv (Dynamic Reference Motion Vector Prediction) kukhazikitsidwa kumawonjezeka ndi pafupifupi 12% pamene kuchepetsa kukumbukira kukumbukira ndi pafupifupi 25%;
  • Kukhazikitsa kwa kukhathamiritsa kwa kamangidwe ka ARM64 kwatsala pang'ono kutha, kumagwira ntchito zambiri mukamagwira ntchito ndi kuya kwamitundu 8, 10 ndi 12;
  • Wowonjezera CDEF fyuluta pogwiritsa ntchito malangizo a AVX-512;
  • Anawonjezera kukhathamiritsa kwatsopano kutengera malangizo a AVX2 ndi SSSE3;
  • Chida cha dav1dpla chathandizira chithandizo chogwira ntchito ndi kuya kwa mtundu wa 10-bit, mawonekedwe osakhala a 4: 2: 0 pixel ndi kupondereza kwa digito pa GPU.

Kumbukirani kuti kanema codec AV1 opangidwa ndi mgwirizano Tsegulani Media (AOMedia), yomwe ili ndi makampani monga Mozilla, Google, Microsoft, Intel, ARM, NVIDIA, IBM, Cisco, Amazon, Netflix, AMD, VideoLAN, Apple, CCN ndi Realtek. AV1 ili m'malo ngati mawonekedwe a kanema opezeka pagulu, opanda malipiro aulere omwe ali patsogolo pa H.264 ndi VP9 potengera kuchuluka kwa kukanikiza. Pazosankha zosiyanasiyana zoyesedwa, pafupifupi AV1 imapereka mulingo womwewo wamtundu pomwe imachepetsa ma bitrate ndi 13% poyerekeza ndi VP9 ndi 17% kutsika kuposa HEVC. Pa ma bitrate apamwamba, kupindula kumawonjezeka kufika 22-27% kwa VP9 ndi 30-43% kwa HEVC. M'mayesero a Facebook, AV1 inaposa mbiri yayikulu H.264 (x264) ndi 50.3% potengera msinkhu wa kukakamiza, mbiri yapamwamba ya H.264 ndi 46.2%, ndi VP9 (libvpx-vp9) ndi 34.0%.

Source: opennet.ru

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