WebM → PNG

Guqula Eyakho WebM ukuba PNG iifayile ngokulula

Khetha iifayile zakho

okanye rhuqa uze ushiye iifayile zakho apha

Inkqubo ekhululekileyo: 1 IiNguqulelo/iyure · Yiya ngaphandle komda →

Guqula iifayile ezifikelela kwi-1 GB simahla, abasebenzisi bePro banokuguqula iifayile ezifikelela kwi-100 GB; Bhalisa ngoku

Iyalayisha

Indlela yokuguqula WebM ukuba PNG

Inyathelo 1: Layisha eyakho WebM iifayile usebenzisa iqhosha elingasentla okanye ngokutsala nokuwisa.

Inyathelo lesi-2: Cofa iqhosha elithi 'Guqula' ukuze uqalise ukuguqula.

Inyathelo lesi-3: Khuphela i-converted yakho PNG iifayile

WebM ukuba PNG Imibuzo Ebuzwa Rhoqo Ngokuguqula

Ndizikhuphele njani iifayili nganye kwi WebM njenge PNG imifanekiso?

Layisha phezulu ifayili WebM kwaye umguquli ubonisa umkhethi we-frame-extraction: i-frame nganye ye-Nth, i-frames kwi-timestamps ekhankanyiweyo, okanye i-frame enye ngesekondi. I-frame nganye ekhethiweyo i-decoded ukusuka kwi-WebM video stream, i-encoded njengefayili ehlukileyo ye PNG, kwaye i-bundled njenge-ZIP yokukhuphela ezantsi. I-WebM yinxalenye encinci eqinileyo ye-Matroska epapashwe yiGoogle ngo-2010 ekhethekileyo ukunika i-HTML5 ividiyo isiqulathi seefayili esingenazo iirhafu. I-PNG yaphuhliswa ngowe-1996 njengento engekhoyo kwipateni ye-GIF, kwaye yayiyifomati yomfanekiso ongekhoyo kwi-web.

Ingaba izihloko ezingaphantsi ziya kubonakala kwi PNG iifayili endizikhuphayo?

Ayinjalo ukuba ziyindawo ebonakalayo yokulandela umbhalo osezantsi ephepheni. I WebM igcina umbhalo osezantsi ephepheni njengendlela yabo yokuhamba kwaye umdlali uzoba phezu komfanekiso ngexesha lokudlala, ngoko ke isakhelo esikhowudiweyo umguquli ubhala ngaphandle njenge PNG inee-pixels ezicocekileyo ezantsi. Isihloko esingaphantsi esikhutshwe kwividiyo phambi kokuba ibe yi WebM siyinto eyahlukileyo - ngoko ziyinxalenye yomfanekiso kwaye yonke isakhelo esikhutshwe sigcina ezi.

Ingaba i-PNG ixhasa ukubonakaliswa ngokucacileyo?

Ifomati isebenza, kodwa umbhali akafuni i-alpha ukunika - ii-frames zevidiyo kunye neephepha ezibonisiweyo zicacile ngokupheleleyo, ngoko ke zonke ii-pixels zifika ziqinile. Isiqhagamshelanisi se-alpha sihlala sisetyenziswa emva koko: kuthetha ukuba ungacima into ephuma kwi-PNG kamva ngaphandle kokuguqula i-format kwakhona. I-PNG yinketho efanelekileyo yokuthatha imifanekiso yekhusi, ilogos, umzobo womgca nantoni na enemiphetho eqinileyo okanye ebonisa ngaphaya — akukho cingo, akukho mbala obandayo.

Ingaba iifayili PNG ziya kuba zikhulu kangakanani?

Ikhulu kunalo lonke ulindeleyo, kuba PNG igcina i-pixel nganye ngokuchanekileyo kunokuba ilinganise. I-1080p ihlala iwela ngaphantsi kwe-2-5 MB kwaye i-4K ihlala ngaphantsi kwe-6-15 MB, ngoko ke ukuphuma okude kudibanisa ngokukhawuleza. Oku kurhwebo oluchanekileyo xa imifanekiso i feed iqhubekeka, kwaye okubi xa zihamba ngqo kwiphepha le-web. I-PNG isebenzisa uxinzelelo lwe-DEFLATE ngaphezulu kwamagqabantshintshi okuskena acociweyo, ngoko ke i-pixel nganye ihlala ngokuchanekileyo, kunye ne-8-bit epheleleyo ye-alpha channel.

Yiyiphi i-resoluton ephuma kuyo imifanekiso ekhutshwe PNG?

Ugqibo olufanayo njengomthombo WebM: i-1080p WebM ivelisa i-1920x1080 PNG ii-frames, i-4K WebM ivelisa i-3840x2160 PNG ii-frames. Umguquli awukhuphi ubungakanani okanye awukhuphi i-sample — ubungakanani be-pixel butsalwa ngqo kwi-frame eyenziwe ukuba isebenze. Sebenzisa /resize-image/ emva kokukhupha ukuba ufuna ii-thumbnails ezincinci.

Ndingayikhupha isakhelo ngasinye se WebM njenge PNG?

Ewe, kodwa uqaphele inani lefayili - i-30 fps 1-minute WebM ivelisa i-1,800 PNG iifayili. Sizifaka kwi-ZIP archive epheleleyo ngokuzenzekelayo. Kwiiclip ezide, khetha "1 ngesekondi" emiselweyo (i-60 iifayili ngesekondi) okanye ukhethe iziqinisekiso zexesha ezikhethekileyo. Iyure ye WebM kwi-frame nganye iza kwenza ~100,000 PNG imifanekiso.

Ingaba i-PNG igcina umbala ophakamileyo we-WebM?

Ewe - umbala uguqulwa kwikhowudi nge-matrix efanayo ebonisa umthombo WebM (BT.709 ye-HD, BT.2020 ye-4K HDR). Amacebo e-HDR afana ne-tone-mapped kwi-SDR xa ekhutshwa kwi-PNG engagcinanga amanqanaba e-HDR pixels ngokusemthethweni (JPG, PNG-8). I-high-bit PNG-16 okanye TIFF i target ukuba ufuna ukugcina uluhlu olubanzi olunamandla.

Ingaba i-PNG isakhelo esikhuphiweyo sikhulu kangakanani na kwi-disk?

Kuxhomekeke kwisisombululo kunye nokhetho lwe-PNG codec: i-1080p PNG frame yi-2-5 MB engenakulahleka, i-1080p JPG kwi-quality 85 yi-200-500 KB. Yahlula nge-frame count ukuze ubungakanani be-ZIP — kwinqanaba eliphezulu, i-PNG ephuma kwi-frame nganye ye-10-minute 1080p WebM imalunga ne-50 GB kwaye ihlukaniswe phakathi kwe-ZIPs ezininzi.

Ingaba i-PNG ekhutshweyo igcina i-EXIF metadata yekhamera?

I WebM ibhokisi ayithabathanga i-EXIF yesakhelo ngasinye ngendlela ikhamera ehlala isenza ngayo, ngoko ke i PNG iifayili ziphuma zingenazinto eziqhotyoshelweyo ze-EXIF. Umguquli ufaka `creation_time` indawo ebonisa kwi-source frame timestamp, ukuze uphinde ulungelelanise i-bundle ngokulandelana kwexesha okanye uqhagamshelane nesihloko esingaphantsi / nabaphawuli besahluko.

Ithatha ixesha elingakanani ukususwa kwesakhelo ukusuka ku WebM ukuya ku PNG?

Isakhelo sokukhupha ikhowudi sikhawulezayo - ngokuqhelekileyo 20- 30% yobude bomthombo. Imini emihlanu WebM -> PNG iqela ligqiba malunga nemizuzu emi- 1 ngaphandle kokuba iframes ezininzi ukhetha, kuba ibhotile yengxowa ye PNG encoder ibhala iifayile ezininzi ezincinci ngokuthe tye, hayi i WebM demuxer.

Ndingazikhuphela iifayili kwixesha elichanekileyo elingaphakathi kwi-WebM yevidiyo?

Ewe - ukhetho oluphambili lwesiqinisekiso sexesha livuma uluhlu oluhlukaniswe nge-comma (umzekelo `00:01:23, 00:05:00, 00:10:42.5`) kwaye luvelisa ifayile enye PNG ngesiqinisekiso sexesha. Isetyenziswa kwiziqendu ezincinci, iziganeko ezibhekisa kwimifanekiso, okanye ukwakha iphepha loqhagamshelwano lokujonga kwakhona.

Ingaba i WebM yam ifihlakeleyo xa ikhutshwa isakhelo?

Ewe - imodeli yobumfihlo efanayo njengengguqulo nganye. Umsuka WebM kunye ne PNG ekhutshweyo iqhutywa kubasebenzi ababekwe ngokukodwa kwaye icinywe kwimizuzu yokuphela.

WebM

I-WebM yenzelwe iwebhu, inikezela ngokusasazwa kwevidiyo ngaphandle kwemali yokuhlawula ngeekhowudi ze-VP8/VP9.

PNG

Iifayili ze-PNG ziqhubekeka ngokucacileyo kwaye zisebenzisa ukucinezela okungalahleki, zenza ukuba zilungele amagrafiki, ilogos, kunye nemifanekiso yekhusi.