{"id":114343,"date":"2024-03-15T18:25:48","date_gmt":"2024-03-15T16:25:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-kodirovshhika-svt-av1-2-0-i-dekodirovshhika-dav1d-1-4-dlya-formata-video-av1"},"modified":"2024-03-15T18:25:48","modified_gmt":"2024-03-15T16:25:48","slug":"vypusk-kodirovshhika-svt-av1-2-0-i-dekodirovshhika-dav1d-1-4-dlya-formata-video-av1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/vypusk-kodirovshhika-svt-av1-2-0-i-dekodirovshhika-dav1d-1-4-dlya-formata-video-av1","title":{"rendered":"Megjelent az SVT-AV1 2.0 k\u00f3dol\u00f3 \u00e9s a dav1d 1.4 dek\u00f3der az AV1 vide\u00f3form\u00e1tumhoz","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent az SVT-AV1 2.0 k\u00f6nyvt\u00e1r kiad\u00e1sa (Scalable Video Technology AV1) az AV1 k\u00f3dol\u00f3 \u00e9s dek\u00f3dol\u00f3 megval\u00f3s\u00edt\u00e1saival, amelyek gyors\u00edt\u00e1s\u00e1hoz a modern Intel CPU-kban megtal\u00e1lhat\u00f3 hardveres p\u00e1rhuzamos\u00edt\u00e1si eszk\u00f6z\u00f6ket haszn\u00e1lj\u00e1k. A projektet az Intel ind\u00edtotta a Netflix-szel val\u00f3 partners\u00e9g keretein bel\u00fcl, a c\u00e9lja, hogy olyan teljes\u00edtm\u00e9nyszintet \u00e9rjen el, amely alkalmass\u00e1 teszi a vide\u00f3k val\u00f3s idej\u0171 \u00e1tk\u00f3dol\u00e1s\u00e1ra \u00e9s az on-demand vide\u00f3 szolg\u00e1ltat\u00e1sokban val\u00f3 alkalmaz\u00e1sra. Jelenleg a fejleszt\u00e9s az Open Media Aliansz (AOMedia) \u00e9gisze alatt folyik, amely az AV1 videok\u00f3dol\u00e1si szabv\u00e1ny fejleszt\u00e9s\u00e9t ir\u00e1ny\u00edtja. A projekt kor\u00e1bban az OpenVisualCloud keretein bel\u00fcl zajlott, amely szint\u00e9n fejleszti az SVT-HEVC \u00e9s SVT-VP9 k\u00f3dol\u00f3kat. A k\u00f3d BSD licenc alatt \u00e9rhet\u0151 el.     <\/p>\n<p>Az SVT-AV1 b\u00e1rmilyen architekt\u00far\u00e1j\u00fa rendszerekhez \u00f6sszeszerelhet\u0151, ahol van C99 szabv\u00e1nyt t\u00e1mogat\u00f3 ford\u00edt\u00f3, de a legjobb teljes\u00edtm\u00e9ny az x86_64 rendszereken \u00e9rhet\u0151 el, ahol SIMD utas\u00edt\u00e1sokon alapul\u00f3 assembly optimaliz\u00e1ci\u00f3kat alkalmaznak (az optim\u00e1lis CPU t\u00e1mogat\u00e1s az AVX2, de legal\u00e1bb az SS2 el\u00e9g). A mem\u00f3riafogyaszt\u00e1s a k\u00f3dol\u00e1s sor\u00e1n haszn\u00e1lt processzormagok sz\u00e1m\u00e1t\u00f3l f\u00fcgg, amelyet a &#171;&#8212;lp&#187; opci\u00f3 szab\u00e1lyoz. Az AV1 algoritmusainak bonyolults\u00e1ga miatt ennek a form\u00e1tumnak a k\u00f3dol\u00e1sa l\u00e9nyegesen t\u00f6bb er\u0151forr\u00e1st ig\u00e9nyel, mint m\u00e1s form\u00e1tumok\u00e9, ami nem teszi lehet\u0151v\u00e9 az AV1 be\u00e9p\u00edtett k\u00f3dol\u00f3 haszn\u00e1lat\u00e1t val\u00f3s idej\u0171 \u00fajrak\u00f3dol\u00e1sra. P\u00e9ld\u00e1ul az AV1 projekt be\u00e9p\u00edtett k\u00f3dol\u00f3ja 5721, 5869 \u00e9s 658-szoros sz\u00e1m\u00edt\u00e1si kapacit\u00e1st ig\u00e9nyel az x264 (&#171;main&#187; profil), x264 (&#171;high&#187; profil) \u00e9s libvpx-vp9 k\u00f3dol\u00f3khoz k\u00e9pest.     <\/p>\n<p>Az \u00faj SVT-AV1 verzi\u00f3ban t\u00f6rt\u00e9nt v\u00e1ltoz\u00e1sok k\u00f6z\u00fcl:  <\/p>\n<ul>\n<li class=\"l\"> \u00c1t\u00e1lltunk az \u00faj verzi\u00f3sz\u00e1moz\u00e1sra, amely szerint az els\u0151 sz\u00e1mjegy a verzi\u00f3ban minden API\/ABI v\u00e1ltoz\u00e1skor m\u00f3dosul.\n<li class=\"l\"> V\u00e1ltoz\u00e1sok t\u00f6rt\u00e9ntek az API-ban, amelyek a folyamat befejez\u00e9s\u00e9nek jelz\u00e9s\u00e9re (EOS &#8212; End Of Stream) vonatkoznak az utols\u00f3 k\u00e9pkock\u00e1ban, ahelyett, hogy \u00fcres k\u00e9pkock\u00e1t haszn\u00e1ln\u00e1nk, ez lehet\u0151v\u00e9 tette a felesleges k\u00e9pkocka megv\u00e1r\u00e1s\u00e1b\u00f3l fakad\u00f3 k\u00e9sleltet\u00e9s kiiktat\u00e1s\u00e1t. Az API m\u00f3dos\u00edt\u00e1sa m\u00e1r t\u00fckr\u00f6z\u0151dik a FFmpeg k\u00f3dalapj\u00e1ban.\n<li class=\"l\"> Elt\u00e1vol\u00edtottuk a h\u00e1rompasszos v\u00e1ltoz\u00f3 bitr\u00e1t\u00e1s k\u00f3dol\u00e1si m\u00f3dot (3-pass VBR), amely helyett most a t\u00f6bbsz\u00f6r\u00f6s VBR mechanizmusa ker\u00fclt alkalmaz\u00e1sra. A t\u00f6bbsz\u00f6r\u00f6s VBR m\u00f3dot k\u00e9t passzusra cs\u00f6kkentett\u00fck a FFmpeg-gel val\u00f3 integr\u00e1ci\u00f3 \u00e9rdek\u00e9ben.\n<li class=\"l\"> A k\u00f3dol\u00f3ba optimaliz\u00e1l\u00e1sok ker\u00fcltek bevezet\u00e9sre, amelyek k\u00f6vetkezt\u00e9ben a M9-M13 presetek t\u00f6m\u00f6r\u00edt\u00e9si hat\u00e9konys\u00e1ga 1-4%-kal n\u0151tt, m\u00edg az M5 preset mem\u00f3riafogyaszt\u00e1sa 20-35%-kal cs\u00f6kkent az LP 8 m\u00f3dban \u00e9s 1-5%-kal m\u00e1s m\u00f3dokban. A t\u00f6bbi preset mem\u00f3riafogyaszt\u00e1sa 1-5%-kal cs\u00f6kkent.\n<li class=\"l\"> Optimaliz\u00e1lt\u00e1k a min\u0151s\u00e9g\/gyorsas\u00e1g kompromisszumokat a magas szint\u0171 min\u0151s\u00e9get ny\u00fajt\u00f3 presetek sz\u00e1m\u00e1ra. Az MR preset, amely referencia min\u0151s\u00e9get biztos\u00edt, 100%-kal gyorsabb\u00e1 v\u00e1lt.\n<li class=\"l\"> A kiz\u00e1r\u00f3lag C nyelven \u00edrt f\u00fcggv\u00e9nyekhez ARM architekt\u00far\u00e1kra vonatkoz\u00f3 optimaliz\u00e1l\u00e1sok ker\u00fcltek bevezet\u00e9sre.        <\/ul>\n<p>Tov\u00e1bb\u00e1 megeml\u00edthet\u0151 a dav1d 1.4.1 projekt kiad\u00e1sa, amelyben a VideoLAN \u00e9s a FFmpeg k\u00f6z\u00f6ss\u00e9gei az AV1 videok\u00f3dol\u00e1si form\u00e1tum alternat\u00edv, szabad dek\u00f3dol\u00f3 k\u00f6nyvt\u00e1r\u00e1t fejlesztik. A dav1d k\u00f6nyvt\u00e1r t\u00e1mogatja az AV1 \u00f6sszes funkci\u00f3j\u00e1t, bele\u00e9rtve a kib\u0151v\u00edtett aldiszkr\u00e9tel\u00e9si t\u00edpusokat \u00e9s az \u00f6sszes, a specifik\u00e1ci\u00f3ban megadott sz\u00ednm\u00e9lys\u00e9g-kezel\u00e9si param\u00e9tert (8, 10 \u00e9s 12 bit). A dav1d kulcsfontoss\u00e1g\u00fa tulajdons\u00e1ga a lehet\u0151 legjobb dek\u00f3dol\u00e1si teljes\u00edtm\u00e9ny el\u00e9r\u00e9se \u00e9s a t\u00f6bb sz\u00e1las m\u0171k\u00f6d\u00e9s biztos\u00edt\u00e1sa. A projekt k\u00f3dja C nyelven (C99) k\u00e9sz\u00fclt, assembler besz\u00far\u00e1sokkal (NASM\/GAS) \u00e9s BSD licenc alatt terjesztik. T\u00e1mogatja az x86, x86_64, ARMv7 \u00e9s ARMv8 architekt\u00far\u00e1kat, valamint a FreeBSD, Linux, Windows, macOS, Android \u00e9s iOS oper\u00e1ci\u00f3s rendszereket.    <\/p>\n<p>A dav1d 1.4 verzi\u00f3 a Loongarch \u00e9s RISC-V architekt\u00far\u00e1k t\u00e1mogat\u00e1s\u00e1val, valamint az AVX-512 utas\u00edt\u00e1sokra alapozott tov\u00e1bbi optimaliz\u00e1l\u00e1sokkal, az ARM rendszereken a 6tap sz\u0171r\u0151k teljes\u00edtm\u00e9ny\u00e9nek n\u00f6vel\u00e9s\u00e9vel, a t\u00f6bb sz\u00e1las munka hat\u00e9konys\u00e1g\u00e1nak jav\u00edt\u00e1s\u00e1val \u00e9s a bin\u00e1ris adatok m\u00e9ret\u00e9nek cs\u00f6kkent\u00e9s\u00e9vel az ARM64, ARM32 \u00e9s RISC-V rendszereken figyelemre m\u00e9lt\u00f3. Megsz\u00fcntett\u00e9k a CVE-2024-1580 sebezhet\u0151s\u00e9get, amely \u00f3ri\u00e1si m\u00e9ret\u0171 k\u00e9pek feldolgoz\u00e1sa sor\u00e1n eg\u00e9szs\u00e9gtelen mem\u00f3riater\u00fcletre \u00edr\u00e1st eredm\u00e9nyezett a t\u00falfoly\u00e1s miatt.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60788\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 SVT-AV1 2.0 (Scalable Video Technology AV1) c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0438 \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0434\u0435\u043e AV1, \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u044b \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0432 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 CPU Intel \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439. \u041f\u0440\u043e\u0435\u043a\u0442 \u0441\u043e\u0437\u0434\u0430\u043d \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Intel \u0432 \u043f\u0430\u0440\u0442\u043d\u0451\u0440\u0441\u0442\u0432\u0435 \u0441 Netflix \u0441 \u0446\u0435\u043b\u044c\u044e \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u0440\u0438\u0433\u043e\u0434\u043d\u043e\u0433\u043e \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0434\u0435\u043e \u043d\u0430 \u043b\u0435\u0442\u0443 \u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0441\u0435\u0440\u0432\u0438\u0441\u0430\u0445, \u043e\u0442\u0434\u0430\u044e\u0449\u0438\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-114343","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 SVT-AV1 2.0 (Scalable Video Technology AV1) c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0438 \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0444\u043e\u0440\u043c\u0430\u0442\u0430 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