{"id":32804,"date":"2019-10-31T21:48:59","date_gmt":"2019-10-31T18:48:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/tretij-vypusk-dav1d-dekodirovshhika-av1-ot-proektov-videolan-i-ffmpeg\/"},"modified":"2019-10-31T21:48:59","modified_gmt":"2019-10-31T18:48:59","slug":"tretij-vypusk-dav1d-dekodirovshhika-av1-ot-proektov-videolan-i-ffmpeg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/tretij-vypusk-dav1d-dekodirovshhika-av1-ot-proektov-videolan-i-ffmpeg","title":{"rendered":"Kolmas v\u00e4ljaanne dav1d'ist, VideoLAN-i ja FFmpeg-i AV1 dekooderist.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

VideoLAN ja FFmpeg kogukonnad avalikustasid<\/a><\/noindex> kolmas v\u00e4ljaanne (0.3) dav1d teegi alternatiivse vabadekooderiga video kodeerimise formaadi rakendusega AV1<\/a><\/noindex>. Projekti kood on kirjutatud C keeles (C99) koos assembleri sisestustega (NASM\/GAS) ja GNU \u00dcldine Avaliku litsentsi alusel.<\/a><\/noindex> BSD litsentsi all. Toetatakse x86, x86_64, ARMv7 ja ARMv8 arhitektuure ning operatsioonis\u00fcsteeme Linux, Windows, macOS, Android ja iOS.<\/p>\n

dav1d teek toetab k\u00f5iki AV1 v\u00f5imalusi, sealhulgas laiendatud alamdisreatsioone ja k\u00f5iki spetsifikatsioonis m\u00e4\u00e4ratud v\u00e4rvis\u00fcgavuse juhtimisparameetreid (8, 10 ja 12 bitti). Teegi t\u00f6\u00f6 on testitud suurel hulgal AV1 formaadis failidest. dav1d peamine omadus on suunatus maksimaalse dekodeerimise j\u00f5udluse saavutamisele ja kvaliteetse t\u00f6\u00f6 tagamisele mitme l\u00f5ime re\u017eiimis.<\/a><\/noindex> k\u00f5ik spetsifikatsioonis deklareeritud v\u00e4rvis\u00fcgavuse juhtimisparameetrid (8, 10 ja 12 bitti). Teegi t\u00f6\u00f6 on testitud suure AV1 formaadis failide kogu peal. dav1di peamine omadus on suunatus v\u00f5imalikult suure dekompresseerimise j\u00f5udluse saavutamisele ja kvaliteetsete toimingute tagamisele mitme l\u00f5ime re\u017eiimis.<\/p>\n

Uues versioonis on lisatud t\u00e4iendavad optimeerimised video dekompresseerimise kiirusel SSSE3, SSE4.1 ja AVX2 k\u00e4skude abiga. Dekodeerimise kiirus SSSE3-toega protsessoritel on kasvanud 24%, samas kui AVX2 s\u00fcsteemides on see suurenenud 4%. Lisatud on assemblerikood kiiruse suurendamiseks SSE4.1 k\u00e4skude abil, mille kasutamine on v\u00f5imaldanud saavutada 26% suurema j\u00f5udluse v\u00f5rreldes optimeerimata versiooniga (SSSE3 k\u00e4skude alusel tehtud optimeerimistega v\u00f5rreldes on v\u00f5it 1.5% tasemel). <\/p>\n

\"Kolmas<\/a><\/noindex><\/center><\/p>\n

Samuti on mobiilseadmete ARM64 arhitektuuril baseeruvate protsessorite dekoodri j\u00f5udlus suurenenud. NEON-i juhiseid kasutavate operatsioonide rakendamisega on j\u00f5udlus suurenenud umbes 12% v\u00f5rreldes eelmise versiooniga.
\n

\"Kolmas<\/a><\/noindex><\/center><\/p>\n

Aomdec'i (libaom) v\u00f5rdluskodeerijaga v\u00f5rreldes on dav1d eelis k\u00f5ige rohkem tuntav mitme l\u00f5ime kasutamise korral (m\u00f5nedes testides on dav1d kiirem 2-4 korda). \u00dche l\u00f5ime re\u017eiimis erineb j\u00f5udlus 10-20% ulatuses.<\/p>\n

\"Kolmas<\/a><\/noindex><\/center>
\n
\"Kolmas<\/a><\/noindex><\/center><\/p>\n

Dav1di rakendamise osas teistes projektides on saavutatud edusamme. Vaikimisi kasutatud<\/a><\/noindex> on dav1d n\u00fc\u00fcd Chromium\/Chrome 74 ja Firefox 67-s (varem oli dav1d kaasa l\u00fclitatud<\/a><\/noindex> Windowsile, kuid n\u00fc\u00fcd lipuke \u00absame-site-by-default-cookies\u00bb, mis, kui Set-Cookie p\u00e4ises ei ole SameSite atribuuti, seab vaikimisi v\u00e4\u00e4rtuseks \u00abSameSite=Lax\u00bb, piirates k\u00fcpsiste edastamist kolmandate osapoolte saitidelt (kui saitidel on endiselt v\u00f5imalik piirangut t\u00fchistada, seades k\u00fcpsiste loomisel selges\u00f5naliselt atribuudi SameSite=None).<\/a><\/noindex> ka Linuxile ja macOS-ile). Dav1di kasutamist FFmpegis ja VLC-s j\u00e4tkatakse, kavandatud on \u00fcleminek dav1d dekooderile Handbrake<\/a><\/noindex>.<\/p>\n

Meenutame, et videokooder AV1<\/a><\/noindex> on v\u00e4lja t\u00f6\u00f6tatud alliansi Open Media<\/a><\/noindex> (AOMedia), kus osalevad sellised ettev\u00f5tted nagu Mozilla, Google, Microsoft, Intel, ARM, NVIDIA, IBM, Cisco, Amazon, Netflix, AMD, VideoLAN, CCN ja Realtek. AV1 on tuntud kui tasuta ja litsentsimisvaba video kodeerimisvorm, mis \u00fcletab H.264 ja VP9 kompressioonitaseme osas. K\u00f5ikidest testitud resolutsioonidest keskmiselt tagab AV1 sama kvaliteeditaseme, v\u00e4hendades bitikiirusest 13% v\u00f5rreldes VP9 ja 17% v\u00f5rreldes HEVC-ga. K\u00f5rgetel bitikiirusel ulatub v\u00f5it 22-27% VP9 puhul ja 30-43% HEVC puhul. Facebooki testides \u00fcletas AV1 kompressioonitaseme poolest main profile H.264 (x264) 50,3%, high profile H.264 46,2% ja VP9 (libvpx-vp9) 34,0%. <\/p>\n

<\/a><\/noindex><\/p>\n

Allikas: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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