{"id":7395,"date":"2026-04-30T00:00:00","date_gmt":"2026-04-29T21:00:00","guid":{"rendered":"https:\/\/elmeistrai.lt\/?p=7395"},"modified":"2026-01-14T14:56:41","modified_gmt":"2026-01-14T12:56:41","slug":"kaip-nustatyti-x264-encoder-nustatymus","status":"publish","type":"post","link":"https:\/\/elmeistrai.lt\/ru\/kaip-nustatyti-x264-encoder-nustatymus\/","title":{"rendered":"Kaip nustatyti x264 encoder nustatymus"},"content":{"rendered":"<h2>Kod\u0117l x264 nustatymai i\u0161 tikr\u0173j\u0173 svarb\u016bs<\/h2>\n<p>Kai pirm\u0105 kart\u0105 atidariau x264 enkoderio nustatymus, pajutau tikr\u0105 \u0161ok\u0105 \u2013 tiek daug parametr\u0173, keist\u0173 termin\u0173 ir pasirinkim\u0173! Bet \u0161tai ko nesupratau i\u0161 karto: \u0161ie nustatymai yra kaip automobilio grei\u010di\u0173 d\u0117\u017e\u0117. Galite va\u017eiuoti tik pirma pavara, bet tikrai nepasieksite maksimalaus efektyvumo. x264 yra vienas populiariausi\u0173 H.264\/AVC vaizdo enkoderio \u012fgyvendinim\u0173, kuris leid\u017eia suspausti vaizdo failus i\u0161laikant puiki\u0105 kokyb\u0119. Problema ta, kad numatytieji nustatymai retai b\u016bna optimal\u016bs konkre\u010diai j\u016bs\u0173 situacijai.<\/p>\n<p>\u0160is enkoderis naudojamas visur \u2013 nuo YouTube vaizdo \u012fra\u0161\u0173 iki profesionali\u0173 film\u0173 gamybos. Tod\u0117l verta suprasti, kaip j\u012f tinkamai sukonfig\u016bruoti. Nesvarbu, ar koduojate asmenin\u012f vaizdo archyv\u0105, ar ruo\u0161iate turin\u012f internetui \u2013 teisingi nustatymai gali sutaupyti valand\u0173 valandas laiko ir gigabaitus vietos.<\/p>\n<h2>Preset sistema \u2013 j\u016bs\u0173 atspirties ta\u0161kas<\/h2>\n<p>Pirmiausia tur\u0117tum\u0117te suprasti preset sistem\u0105. Tai kaip pasirinkti recept\u0105 prie\u0161 pradedant gaminti \u2013 duoda ger\u0105 pagrind\u0105, kur\u012f v\u0117liau galite pritaikyti. x264 si\u016blo devynis pagrindinius preset&#8217;us: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower ir veryslow. Dar yra placebo, bet atvirai kalbant, jo naudoti neverta \u2013 skirtumas nuo veryslow yra mikroskopinis, o kodavimo laikas i\u0161auga astronomi\u0161kai.<\/p>\n<p>Kiekvienas preset&#8217;as i\u0161 esm\u0117s nustato, kiek laiko enkoderis skiria ie\u0161koti geriausio b\u016bdo suspausti kiekvien\u0105 vaizdo kadr\u0105. Medium yra numatytasis variantas ir puikus pasirinkimas daugumai situacij\u0173. Jei koduojate archyvui ar galutiniam platinimui, rekomenduo\u010diau slow arba slower \u2013 kokyb\u0117s skirtumas tikrai pastebimas, ypa\u010d \u017eemesniais bitrate&#8217;ais.<\/p>\n<p>Asmeni\u0161kai da\u017eniausiai naudoju slow preset&#8217;\u0105. Taip, kodavimas trunka ilgiau, bet kai koduoji film\u0105, kur\u012f \u017emon\u0117s \u017ei\u016br\u0117s daug kart\u0173, verta investuoti papildom\u0105 laik\u0105. Jei koduojate tiesiogin\u0119 transliacij\u0105 ar reikia greit\u0173 rezultat\u0173, veryfast ar faster bus j\u016bs\u0173 draugai.<\/p>\n<h2>CRF ir bitrate \u2013 kokyb\u0117s valdymo \u0161irdis<\/h2>\n<p>Dabar pereikime prie vieno svarbiausi\u0173 sprendim\u0173: kaip kontroliuoti kokyb\u0119? Turite du pagrindinius metodus \u2013 CRF (Constant Rate Factor) ir tiesioginis bitrate&#8217;o nustatymas. CRF yra protingesnis b\u016bdas daugumai atvej\u0173.<\/p>\n<p>CRF veikia skal\u0117je nuo 0 iki 51, kur 0 yra beveik be nuostoli\u0173 kokyb\u0117 (ir mil\u017eini\u0161ki failai), o 51 \u2013 siaubinga kokyb\u0117. Auksin\u0117 viduriukas yra tarp 18 ir 23. Asmeni\u0161kai da\u017eniausiai naudoju:<\/p>\n<ul>\n<li><b>CRF 18<\/b> \u2013 labai auk\u0161ta kokyb\u0117 archyvams ar \u0161altinio failams<\/li>\n<li><b>CRF 20-21<\/b> \u2013 puiki kokyb\u0117 kasdieniniam naudojimui<\/li>\n<li><b>CRF 23<\/b> \u2013 gera kokyb\u0117, ma\u017eesni failai<\/li>\n<li><b>CRF 26-28<\/b> \u2013 priimtina kokyb\u0117 mobiliam per\u017ei\u016brai ar ribotam pralaidumui<\/li>\n<\/ul>\n<p>Kod\u0117l CRF geresnis u\u017e fiksuot\u0105 bitrate&#8217;\u0105? Nes skirtingi kadrai reikalauja skirtingo duomen\u0173 kiekio. Ramios scenos su m\u0117lynu dangumi gali b\u016bti puikiai suspaustos su ma\u017eu bitrate&#8217;u, o intensyvios veikimo scenos su daug detali\u0173 reikalauja daugiau duomen\u0173. CRF automati\u0161kai prisitaiko, skirdamas daugiau bit\u0173 sud\u0117tingiems kadrams ir ma\u017eiau \u2013 paprastiems.<\/p>\n<p>Ta\u010diau yra situacij\u0173, kai reikia fiksuoto bitrate&#8217;o \u2013 pavyzd\u017eiui, kai koduojate DVD ar Blu-ray diskui su grie\u017etais dyd\u017eio apribojimais. Tokiu atveju naudokite dviej\u0173 pra\u0117jim\u0173 (2-pass) kodavim\u0105, kuris pirm\u0105 kart\u0105 analizuoja vis\u0105 vaizdo \u012fra\u0161\u0105, o antr\u0105 \u2013 koduoja optimaliai paskirstydamas bitus.<\/p>\n<h2>Tune parametrai specifin\u0117ms situacijoms<\/h2>\n<p>Tune parametrai yra kaip special\u016bs priedai prie j\u016bs\u0173 pagrindinio preset&#8217;o. Jie optimizuoja enkoderio elges\u012f konkre\u010diam turinio tipui. \u0160tai patys naudingesnieji:<\/p>\n<p><b>Film<\/b> \u2013 skirtas \u012fprastam film\u0173 turiniui. Tai numatytasis variantas ir tinka daugumai situacij\u0173. Jei ne\u017einote, k\u0105 pasirinkti, tiesiog nesinaudokite jokiu tune parametru.<\/p>\n<p><b>Animation<\/b> \u2013 puikiai tinka animacijai, anime, animaciniams filmams. Animacija turi kitokias charakteristikas nei tikras vaizdas \u2013 da\u017enai yra a\u0161tri\u0173 kra\u0161t\u0173, plok\u0161\u010di\u0173 spalv\u0173 sri\u010di\u0173 ir ma\u017eiau nat\u016bralaus triuk\u0161mo. \u0160is tune&#8217;as tai atsi\u017evelgia ir gali sutaupyti nema\u017eai vietos i\u0161laikant kokyb\u0119.<\/p>\n<p><b>Grain<\/b> \u2013 kai j\u016bs\u0173 \u0161altinis turi daug filminio gr\u016bdo ar triuk\u0161mo, ir norite j\u012f i\u0161saugoti. \u012esp\u0117ju \u2013 failai bus didesni, nes gr\u016bdas yra sunkiai suspaud\u017eiamas. Bet jei tai svarbi vaizdo dalis (pavyzd\u017eiui, senesni filmai), \u0161is parametras pad\u0117s i\u0161vengti nemaloni\u0173 artefakt\u0173.<\/p>\n<p><b>Stillimage<\/b> \u2013 ekrano \u012fra\u0161ams ar slideshow, kur kadrai kei\u010diasi retai arba visai nesikei\u010dia. Optimizuoja kodavim\u0105 tokiam turiniui.<\/p>\n<p><b>Fastdecode<\/b> \u2013 suma\u017eina kodavimo sud\u0117tingum\u0105, kad vaizdo \u012fra\u0161as b\u016bt\u0173 lengviau atkuriamas silpnesn\u0117se sistemose. Naudokite, jei \u017einote, kad turinys bus \u017ei\u016brimas senuose \u012frenginiuose.<\/p>\n<p>Prakti\u0161kai a\u0161 naudoju animation tune&#8217;\u0105 bet kokiam animuotam turiniui \u2013 skirtumas tikrai pastebimas. O film tune&#8217;\u0105 (arba jokio) viskam kitam.<\/p>\n<h2>Profile ir level \u2013 suderinamumo garantai<\/h2>\n<p>\u010cia tampa \u0161iek tiek techni\u0161kai, bet svarbu suprasti. H.264 standartas turi skirtingus profilius ir lygius, kurie nustato, kokias funkcijas galima naudoti. Pagrindiniai profiliai:<\/p>\n<p><b>Baseline<\/b> \u2013 seniausias ir papras\u010diausias. Veikia visur, bet neefektyvus. \u0160iandien retai naudojamas, nebent koduojate labai seniems \u012frenginiams.<\/p>\n<p><b>Main<\/b> \u2013 vidutinis variantas. Geras balansas tarp suderinamumo ir efektyvumo.<\/p>\n<p><b>High<\/b> \u2013 modernus standartas, kur\u012f palaiko beveik visi \u0161iuolaikiniai \u012frenginiai (nuo ~2010 met\u0173). Leid\u017eia naudoti visas efektyviausias x264 funkcijas. Tai tur\u0117t\u0173 b\u016bti j\u016bs\u0173 numatytasis pasirinkimas.<\/p>\n<p>Level nustato maksimal\u0173 bitrate&#8217;\u0105, rai\u0161k\u0105 ir kitus techninius parametrus. Pavyzd\u017eiui:<\/p>\n<ul>\n<li>Level 3.0 \u2013 iki 720p 30fps<\/li>\n<li>Level 3.1 \u2013 iki 1080p 30fps<\/li>\n<li>Level 4.0 \u2013 iki 1080p 60fps<\/li>\n<li>Level 4.1 \u2013 iki 1080p 60fps su didesniu bitrate&#8217;u<\/li>\n<li>Level 5.0 \u2013 iki 4K 30fps<\/li>\n<li>Level 5.1 \u2013 iki 4K 60fps<\/li>\n<\/ul>\n<p>Da\u017eniausiai x264 automati\u0161kai pasirenka tinkam\u0105 level&#8217;\u012f pagal j\u016bs\u0173 vaizdo parametrus, tod\u0117l rankiniu b\u016bdu nustatyti nereikia. Ta\u010diau jei koduojate konkre\u010diam \u012frenginiui (pvz., PlayStation, Apple TV), patikrinkite jo specifikacijas ir nustatykite atitinkam\u0105 profil\u012f bei level&#8217;\u012f.<\/p>\n<h2>Pa\u017eang\u016bs parametrai, kurie tikrai veikia<\/h2>\n<p>Dabar pereikime prie parametr\u0173, kurie gali reik\u0161mingai paveikti kokyb\u0119 ir dyd\u012f, bet n\u0117ra akivaizd\u016bs pradedantiesiems.<\/p>\n<p><b>Reference frames (ref)<\/b> \u2013 kiek ankstesni\u0173 kadr\u0173 enkoderis gali naudoti kaip nuorod\u0105. Daugiau reference frames = geresn\u0117 kompresija, bet l\u0117tesnis dekodavimas. Numatytai medium preset&#8217;as naudoja 3, slow \u2013 5. Galite pakelti iki 8-16 archyviniams kodavimams, bet atsiminkite, kad kai kurie \u012frenginiai (ypa\u010d mobilieji) gali tur\u0117ti problem\u0173 su >4 reference frames.<\/p>\n<p><b>B-frames (bframes)<\/b> \u2013 dvikryp\u010diai kadrai, kurie gali naudoti informacij\u0105 i\u0161 praeities IR ateities kadr\u0173. Labai efektyv\u016bs kompresijai. x264 numatytai naudoja 3, bet galite pakelti iki 8-16. Prakti\u0161kai >8 retai duoda daug naudos.<\/p>\n<p><b>Deblock filter<\/b> \u2013 filtras, kuris suma\u017eina blokinius artefaktus. Numatytai \u012fjungtas su reik\u0161m\u0117mis 0:0, ir da\u017eniausiai taip ir tur\u0117t\u0173 likti. Kai kas m\u0117gsta \u0161iek tiek suma\u017einti (pvz., -1:-1) animacijai, bet b\u016bkite atsarg\u016bs \u2013 per daug suma\u017einus gali atsirasti nemaloni\u0173 artefakt\u0173.<\/p>\n<p><b>Motion estimation (me)<\/b> \u2013 kaip enkoderis ie\u0161ko jud\u0117jimo tarp kadr\u0173. Variantai: dia (grei\u010diausias), hex, umh, esa (l\u0117\u010diausias, bet tiksliausias). Preset&#8217;ai jau nustato protingas reik\u0161mes, bet jei norite i\u0161spausti maksimali\u0105 kokyb\u0119, slow preset&#8217;e pakeiskite \u012f umh arba net esa.<\/p>\n<p><b>Subpixel refinement (subme)<\/b> \u2013 jud\u0117jimo \u012fvertinimo tikslumas. Skal\u0117 nuo 1 iki 11. Auk\u0161tesn\u0117s reik\u0161m\u0117s = geresn\u0117 kokyb\u0117, bet l\u0117tesnis kodavimas. Slow preset&#8217;as naudoja 8, veryslow \u2013 10. Asmeni\u0161kai retai kei\u010diu \u0161\u012f parametr\u0105 \u2013 preset&#8217;ai jau nustato gerai.<\/p>\n<h2>Praktiniai komand\u0173 pavyzd\u017eiai realiems scenarijams<\/h2>\n<p>Teorija teorija, bet kaip tai atrodo praktikoje? \u0160tai keletas komand\u0173, kurias pats da\u017enai naudoju:<\/p>\n<p><b>Universalus auk\u0161tos kokyb\u0117s kodavimas:<\/b><\/p>\n<pre>\nx264 --preset slow --crf 20 --profile high --input input.y4m --output output.h264\n<\/pre>\n<p><b>Animacijos kodavimas:<\/b><\/p>\n<pre>\nx264 --preset slow --tune animation --crf 19 --profile high --input anime.y4m --output anime.h264\n<\/pre>\n<p><b>Greitas kodavimas, priimtina kokyb\u0117:<\/b><\/p>\n<pre>\nx264 --preset veryfast --crf 23 --profile high --input input.y4m --output output.h264\n<\/pre>\n<p><b>Maksimali kokyb\u0117 archyvui (l\u0117tas!):<\/b><\/p>\n<pre>\nx264 --preset veryslow --crf 18 --ref 8 --bframes 8 --me umh --profile high --input input.y4m --output output.h264\n<\/pre>\n<p><b>Dviej\u0173 pra\u0117jim\u0173 kodavimas su tiksliniu bitrate&#8217;u:<\/b><\/p>\n<pre>\nx264 --preset slow --pass 1 --bitrate 5000 --stats stats.log --profile high --input input.y4m --output \/dev\/null\nx264 --preset slow --pass 2 --bitrate 5000 --stats stats.log --profile high --input input.y4m --output output.h264\n<\/pre>\n<p><b>Ekrano \u012fra\u0161as su tekstu:<\/b><\/p>\n<pre>\nx264 --preset medium --tune stillimage --crf 22 --profile high --input screen.y4m --output screen.h264\n<\/pre>\n<p>Pastaba: \u0161ie pavyzd\u017eiai naudoja .y4m \u012fvest\u012f, nes x264 tiesiogiai dirba su nesupaustais vaizdo formatais. Praktikoje da\u017eniausiai naudosite x264 per FFmpeg ar kit\u0105 \u012frank\u012f, kuris konvertuoja \u012fvest\u012f automati\u0161kai.<\/p>\n<h2>Da\u017eniausios klaidos ir kaip j\u0173 i\u0161vengti<\/h2>\n<p>Per metus eksperimentavimo su x264 padariau nema\u017eai klaid\u0173. \u0160tai ko tur\u0117tum\u0117te vengti:<\/p>\n<p><b>Klaida #1: Naudoti per \u017eem\u0105 CRF archyviniams \u012fra\u0161ams.<\/b> Kart\u0105 koduojau vis\u0105 savo \u0161eimos vaizdo archyv\u0105 su CRF 25, manydamas, kad sutaupysiu vietos. V\u0117liau, per\u017ei\u016br\u0117damas dideliame ekrane, pasteb\u0117jau artefaktus, kuri\u0173 nebepa\u0161alinsi. Dabar archyvams naudoju CRF 18-20.<\/p>\n<p><b>Klaida #2: Manyti, kad ultrafast sutaupys daug laiko.<\/b> Taip, kodavimas greitas, bet failai b\u016bna 2-3 kartus didesni nei su medium preset&#8217;u. Jei vis tiek reikia vaizdo \u012fra\u0161\u0105 \u012fkelti \u012f internet\u0105, sutaupytas kodavimo laikas prarandamas laukiant, kol \u012fkels did\u017eiul\u012f fail\u0105.<\/p>\n<p><b>Klaida #3: Ignoruoti \u0161altinio kokyb\u0119.<\/b> Jei j\u016bs\u0173 \u0161altinis jau yra prastos kokyb\u0117s ar stipriai suspaustas, naudoti CRF 18 ir veryslow preset&#8217;\u0105 neturi prasm\u0117s. Geriau naudokite CRF 21-23 \u2013 vis tiek negausite geresn\u0117s kokyb\u0117s, o failas bus ma\u017eesnis.<\/p>\n<p><b>Klaida #4: Naudoti per daug pa\u017eangi\u0173 parametr\u0173 nesuprantant.<\/b> Kart\u0105 radau internete &#8222;optimalius nustatymus&#8221; su daugybe egzoti\u0161k\u0173 parametr\u0173. Rezultatas? Kodavimas truko am\u017einyb\u0119, o kokyb\u0117 buvo vos vos geresn\u0117 nei su paprastu slow preset&#8217;u.<\/p>\n<p><b>Klaida #5: Nepatikrinti suderinamumo.<\/b> Jei koduojate vaizdo \u012fra\u0161\u0105, kur\u012f \u017ei\u016br\u0117s kiti \u017emon\u0117s senuose \u012frenginiuose, nesinaudokite High 5.1 profiliu su 16 reference frames. Jie tiesiog negal\u0117s jo atkurti. Main profile su Level 4.0 yra saugesnis pasirinkimas.<\/p>\n<h2>Kai viskas susid\u0117lioja \u012f viet\u0105<\/h2>\n<p>x264 nustatymai i\u0161 prad\u017ei\u0173 atrodo kaip beproti\u0161kas parametr\u0173 chaosas, bet i\u0161 tikr\u0173j\u0173 viskas sukasi apie kelet\u0105 pagrindini\u0173 sprendim\u0173: kokios kokyb\u0117s norite (CRF), kiek laiko turite (preset), kokio tipo turin\u012f koduojate (tune), ir kam skirtas rezultatas (profile\/level).<\/p>\n<p>Mano asmenin\u0117 rekomendacija pradedantiesiems: prad\u0117kite nuo <code>--preset slow --crf 20<\/code> ir eksperimentuokite i\u0161 ten. Jei failai per dideli, padidinkite CRF iki 22-23. Jei kokyb\u0117 nepakankama, suma\u017einkite iki 18-19. Jei kodavimas per l\u0117tas, pakeiskite \u012f medium ar fast preset&#8217;\u0105. Koduojate animacij\u0105? Prid\u0117kite <code>--tune animation<\/code>. \u0160tai ir viskas.<\/p>\n<p>Neu\u017esiciklinkit ant tobul\u0173 nustatym\u0173. Skirtumas tarp &#8222;labai ger\u0173&#8221; ir &#8222;ideali\u0173&#8221; nustatym\u0173 da\u017enai yra vos pastebimas, bet gali kainuoti dvigubai daugiau laiko. Geriau sukoduoti su gerais nustatymais ir \u017ei\u016br\u0117ti turin\u012f, nei praleisti valandas optimizuojant parametrus, kuri\u0173 skirtum\u0105 pamatysite tik lyginant kadrus vienas \u0161alia kito.<\/p>\n<p>Ir paskutinis patarimas: visada i\u0161saugokite original\u0105. Vaizdo kodavimas yra nuostolinga operacija \u2013 kart\u0105 sukoduota negalima &#8222;atkoduoti&#8221; atgal \u012f originali\u0105 kokyb\u0119. Jei v\u0117liau pasirodys geresni enkodavimo metodai ar suprasite, kad reikia kitoki\u0173 nustatym\u0173, tur\u0117site i\u0161 ko koduoti i\u0161 naujo.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kod\u0117l x264 nustatymai i\u0161 tikr\u0173j\u0173 svarb\u016bs Kai pirm\u0105 kart\u0105 atidariau x264 enkoderio nustatymus, pajutau tikr\u0105 \u0161ok\u0105 \u2013 tiek daug parametr\u0173,&#8230;<\/p>","protected":false},"author":1,"featured_media":7394,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-7395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kompiuteriu-remontas-kompiuteriai-naujienos-patarimai","wpcat-7-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kaip nustatyti x264 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