Tso tawm dav1d 0.7, AV1 decoder los ntawm VideoLAN thiab FFmpeg tej yaam num

VideoLAN thiab FFmpeg zej zog luam tawm tso tawm dav1d 0.7.0 tsev qiv ntawv nrog rau kev siv ntawm lwm txoj kev dawb video encoding hom decoder AV1. Txoj haujlwm code yog sau rau hauv C (C99) nrog cov khoom sib dhos (NASM / GAS) thiab faib los ntawm nyob rau hauv BSD daim ntawv tso cai. Kev them nyiaj yug rau x86, x86_64, ARMv7 thiab ARMv8 architectures, thiab Linux, Windows, macOS, Android thiab iOS operating systems yog siv.

Lub tsev qiv ntawv dav1d txhawb nqa tag nrho AV1 nta, suav nrog kev pom siab subsampling thiab tag nrho cov xim qhov tob tswj tsis tau teev nyob rau hauv specification (8, 10 thiab 12 khoom). Lub tsev qiv ntawv tau raug sim ntawm cov ntaub ntawv loj hauv AV1 hom ntawv. Qhov tseem ceeb ntawm dav1d yog nws txoj kev tsom mus rau kev ua tiav qhov ua tau zoo tshaj plaws ntawm kev txiav txim siab thiab ua kom muaj kev ua haujlwm zoo hauv ntau txoj xov.

В tshiab version:

• Kev ua tau zoo ntawm refmv (Dynamic Reference Motion Vector Prediction) kev siv yog nce li ntawm 12% thaum txo kev nco txog kwv yees li 25%;
• Kev siv ntawm ARM64 kev ua kom zoo nkauj tshwj xeeb yog yuav luag tiav, suav nrog ntau cov haujlwm thaum ua haujlwm nrog cov xim tob ntawm 8, 10 thiab 12 khoom;
• Ntxiv CDEF lim siv AVX-512 cov lus qhia;
• Ntxiv kev ua kom zoo dua tshiab raws li AVX2 thiab SSSE3 cov lus qhia;
• Lub dav1dpla qhov hluav taws xob tau txhim kho kev txhawb nqa rau kev ua haujlwm nrog 10-ntsis xim qhov tob, tsis yog-4: 2: 0 pixel hom thiab cov suab nrov digital ntawm GPU.

Nco qab tias video codec AV1 tsim los ntawm alliance Qhib Media (AOMedia), uas muaj cov tuam txhab xws li Mozilla, Google, Microsoft, Intel, ARM, NVIDIA, IBM, Cisco, Amazon, Netflix, AMD, VideoLAN, Apple, CCN thiab Realtek. AV1 tau muab tso rau hauv kev tshaj tawm rau pej xeem, tsis muaj nuj nqis tsis pub dawb video encoding hom ntawv uas pom tau ua ntej ntawm H.264 thiab VP9 hais txog qib compression. Thoob plaws hauv ntau qhov kev daws teeb meem tau sim, qhov nruab nrab AV1 muab tib theem zoo thaum txo cov bitrates los ntawm 13% piv rau VP9 thiab 17% qis dua HEVC. Ntawm cov bitrates siab, qhov nce mus rau 22-27% rau VP9 thiab mus rau 30-43% rau HEVC. Hauv kev ntsuam xyuas Facebook, AV1 ua tau zoo tshaj qhov profile H.264 (x264) los ntawm 50.3% nyob rau hauv cov nqe lus ntawm compression theem, siab profile H.264 los ntawm 46.2%, thiab VP9 (libvpx-vp9) los ntawm 34.0%.

Tau qhov twg los: opennet.ru