MP4 → WebP

Vula kumdlali, fumana ixesha kwaye uqaphele ikhowudi yexesha, kuba MP4 ayisoloko ithatha uphawu lwesithuba sokuhamba. Ncamathisela kulo mhlaba wexesha lokuqalisa, yongeza ixesha elithathayo, kwaye umguquli ukhangela kulo mfanekiso kwaye ukhupha ikhowudi kuphela kwinqanaba olumkileyo. Ukukhangela kulungile kwisakhelo, kodwa kunokuba kulungileyo kuphela njengenani elinikezelwa - khangela ngokuchasene nokujonga phambi koshicilelo phambi kokufaka ikhonkco elide. I-MP4 ixhasa kuphela ifomati enye ethandwayo yesihloko esingaphantsi (mov_text), nesandi esininzi esingenakuthembeka ngaphandle kwabadlali be-desktop.

I-MP4 yifayili ye-ISO esekelwe kwi-media, kwaye eli sapho lirekhoda ujikelezo njengeflegi kwisiqulathi seefayili kunokuba lijikeleze ii-pixels - oko kukuthi, iclip ethathwe ngokuthe nkqo kwifowuni ingabonakaliyo kwi-player enye kwaye ihlale kwicala lenye. Umfanekiso ophilayo ukhiwa kwi-pixels ezifihliweyo, ngoko ke i-flegi kufuneka ihlolwe phambi kokuba i-frame yokuqala ibhalwe; ukuba ukujonga ngaphambili kubuyela umva, ujikeleze umthombo uguqule kwakhona. Zonke izinto ezingaphezulu malunga nekhamera okanye umhleli woshicilelo ziyimeko elula: umkhondo wevidiyo omnye, umsinga oqinileyo we-frames. I-MP4 eninzi eluhlaza yi-H.264 yevidiyo enesandi se-AAC; isiqulathi seefayili sigcina ngokusemthethweni i-HEVC, i-AV1 ne-VP9.

Ewe, xa ufumana ifayile. I MP4 yiyo esetyenziswa yi web kwividiyo ekwilayini ecacileyo kuba ibrowser idlala ngaphandle koplugin, ngoko iclip edlala kwi tab ihlala i MP4 eqhelekileyo egcina kwaye ikhupha apha njenge nayiphi na enye ifayile. Ukungafaniyo kumdlalo osasazayo onika iziqendu ezifutshane ezilinganisayo endaweni yefayile enye - ezi kufuneka ziphinde zidityaniswe phambi kokuba nantoni na iguqulwe. Iimvume ziyinto enye ekufuneka iqinisekiswe: ukukwazi ukulayisha ezantsi ividiyo ayifani nokuba uvunyelwe ukushicilela kwakhona udweliso oluyenziweyo. I-MP4 yindawo ekhuselekileyo yokunikezelwa kweenkqubo ezifumanekayo - yonke ifowuni, ibrowser, i-console, umhleli kunye neSmart TV eyenziwe kwiminyaka elishumi edlulileyo idlala ngaphandle kwesoftware engaphezulu.

Ilahlekile, nantoni na eyaqala njengevidiyo. I-WebP ephefumlelweyo ingakhowudisa iframes zayo ngayiphi na indlela: indlela engalahlekiyo igcina yonke i-pixel kwaye ilungele imifanekiso ethe tyaba kunye nombhalo wekhusi, ngelixa indlela engalahlekiyo isebenzisa umbono osekelwe kwibloki wohlobo lwe-codec yevidiyo esebenzisayo kwaye ilungele imifanekiso ebonakalayo. Iiframe zekhamera zigcwele i-grain elungileyo kunye ne-gradients apho uxinzelelo olungalahlekiyo lufumananga umzobo, ngoko ke ubugcisa olungalahlekiyo lweclip erekhodiweyo luya kusebenza amaxesha amaninzi ubungakanani be-lossy one ebonakala ngathi ifana. Yishiye ilahlekile ngaphandle kokuba umthombo wawungurekhodo lwekhusi lombhalo ocacileyo. I-WebP ihlala ikwinqanaba lesithathu ngaphandle komkhangeli zincwadi — ushicilelo lokuhamba komsebenzi, i-Office edala i-Office edala i-Office kunye nezinye ii-galeri zefowuni aziyi kuxhaswa.

I-animated WebP isebenza kakuhle kwii-clip ezingaphantsi kwee-seconds ezili-10. Kungaphezulu kwee-balloons zefayili (i-GIF ibalulekile kwi-frame nganye engacinezelwanga). Kwi-animations ezide injongo i-animated WebP okanye APNG, zombini zisebenzisa i-video-codec-grade compression ne-scale kakhulu.

I-GIF ephefumlelweyo: 2 ukuya 8 MB kwi-480p kuxhomekeke kunzima kokuhamba. I-WebP ephefumlelweyo: 200 KB ukuya kwi-1 MB kwi-resolution / umgangatho ofanayo. I-WebP ephefumlelweyo i-5 ukuya kwi-10x ingcono kune-GIF kumgangatho ofanayo wokubona. I-WebP inikezela zombini iimeko ezilahlekileyo nezingalahlekileyo, ngokubonisa ngokucacileyo kwe-alpha noopopayi abafumanekayo kumnye.

Ngokungagqibekanga siyikhupha i-sample ukuya kwi-15fps ye-GIF ejikelezayo (isebenza ngokubonakalayo ngaphezulu kwe-25fps) kunye ne-24fps ye-WebP / APNG ejikelezayo (ephatha i-rate ephezulu ngokucocekileyo). Nciphisa ngokugqithiseleyo nge-frame-rate option ukuba umbonisi wakho uxhasa i-source rate.

Hayi — iifomati WebP eziphilayo (i-GIF, i-WebP, i-APNG) azigcinwanga isandi. Ukuba ufuna isandi, misela isiqulathi sevidiyo (i-MP4, i-WebM) endaweni yefomati yomfanekiso ophilayo.

Ewe - ukhetho lokubala iilophu lulawula ukuba i WebP iilophu liphela (elimiselweyo), idlala i-N amaxesha, okanye idlala ngokuchanekileyo kabini. Ubalo lwelophu lugcinwa kwi WebP i-metadata yesiqulathi seefayili kwaye luhlolwe ngazo zonke izibonisi zexesha elidlulileyo.

Izizathu ezimbini eziqhelekileyo. Eyona, i-frame-rate downsampling: 15 fps WebP ukusuka kwi-60 fps MP4 ikhupha i-75% ye-frames; ilungisa nge-frame-rate slider. Eyona, i-palette quantification: i-GIF imiselwe kwimibala emi-256 kunye ne-gradient-heavy MP4 dithers ebonakalayo. Tshintsha kwi-WebP ejikelezayo yobuxoki bombala opheleleyo.

Ewe - ukhetho lokuguqula ubungakanani luyikhupha i-MP4 ezantsi phambi kokukhupha isakhelo, oluyikhupha ngokugqithisileyo ubungakanani befayili ye-WebP. I-480p WebP ukusuka kwi-4K MP4 incinci nge-16x kune-4K WebP. Sebenzisa /video-cutter/ ukutywina kwinyathelo elahlukileyo.