MP4 → WebP

Vula kumdlali, fumana ixesha kwaye uqaphele ikhowudi yexesha, kuba i MP4 ayisoloko ithatha uphawu lwesithuba sokuhamba. Cola oko kwindawo yexesha lokuqalisa, yongeza ixesha elithathayo, kwaye umguquli ukhangela kuloo ndawo kwaye ukhupha ikhowudi kuphela kwinqanaba ofunayo. 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), kwaye i-multi-track audio ayithembeki ngaphandle kwee-desktop players.

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 kumdlali omnye kwaye ihlale kwicala lakhe kwinye. Umfanekiso ophilayo ukhiwa kwi-pixels ezifihliweyo, ngoko ke i-flegi kufuneka ihlolwe phambi kokuba i-frame yokuqala ibhalwe; ukuba imboniso ibuyela umva ngasecaleni, jikelezisa umthombo uze uyiguqule 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 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 akufana nokwazi ukupapasha 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.

Ulahleko, 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 uyilo olungenalahleko lomshicileli orekhodiweyo unokusebenza amaxesha amaninzi ubungakanani be-lossy one ebonakala ngathi ifana. Yishiye ilahlekiyo 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 ilingana neeklipi ezingaphantsi kwee-10 zeesekondi. Ii-clip ezide kunezo zikhupha i-balloons ngokukhawuleza — i-GIF ayicinyiswanga-nge-frame nganye, ngoko ke nakwi-clip ezincinci ziqhuba kwi-megabytes ezininzi. Kwii-animations ezide, khangela i-animated WebP okanye APNG, zombini ezizicinyise ngokufana nee-codecs zevidiyo zakudala.

I-GIF ekhoyo kwi-480p ifumana 2-8 MB ngokuxhomekeka kwi-motion complexity. I-WebP ekhoyo kwi-resolution / umgangatho ofanayo, ilindele 200 KB ukuya kwi-1 MB — i-WebP ekhoyo isebenza 5-10x kakuhle kune-GIF kwi-visual quality efanayo. I-WebP inikezela zombini iimeko ezilahlekileyo nezingalahlekileyo, ngokubonisa ngokucacileyo kwe-alpha noopopayi abafumanekayo kumnye.

Ngokungagqibekanga siyikhupha i-sample ukuya kwi-15 fps ye-GIF ephilileyo (i-GIF isebenza kakubi ngaphezulu kwe-25 fps kwizibonisi ezininzi) kunye ne-24 fps ye-WebP / APNG ephilileyo (ephatha i-rate ephezulu kakuhle). Ukhetho lwe-frame-rate lugqitha okumiselweyo ukulondoloza i-rate yombhalo ovela kwi-MP4 yakho ukuba i-target viewer yakho ixhasa loo nto.

Hayi — iifomati eziboniswayo WebP (GIF, WebP, APNG) azigcinanga isandi. Ukuba ufuna isandi neclip yakho, cwangcisa isiqulathi sevidiyo (MP4, WebM, MKV) endaweni ye WebP. Ii-embeds ezininzi zezentlalo (Twitter, Discord) ziguqula ngokusesikweni ukufaka i-MP4 kwi-GIF-style autoplay loops, zikunika okulungileyo kwezi zimbini.

Ewe - ukhetho lokubala i-loop lulawula ukuba i-WebP ijikeleza kungekho kuphela kwayo (okungagqibekanga), idlala i-N amaxesha, okanye idlala kabini kwaye i stops. Ubalo lwe-loop lugcinwa kwi-WebP i-metadata yesiqulathi seefayili kwaye luhlonishwa ngumbonisi wonke omtsha, umkhangeli wewebhu, kunye nokufaka umgangatho.

Izizathu ezimbini eziqhelekileyo: ukunyuka kwesampulu ye-frame-rate (sikhupha i-30 fps MP4 ukuya kwi-15 fps GIF ngokumiselweyo — sikhuphe ukhetho lwe-frame-rate ukuze sibuyisele ulusu) kunye nokunyuka kwesampulu yengqokelela yezixhobo (i-GIF imiselwe kuma-256 amibala nge-frame, eyenza i-posterize iithayile ngendlela eyenziwe ngayo i-MP4 yokuqala). Tshintsha isiphelo kwi-WebP ephefumlelweyo ukuqinisekisa umbala opheleleyo.

Ewe - ukhetho lokuguqula ubungakanani lunyusa ingxelo ezantsi phambi kokukhupha isakhelo, esenza ukuba ubungakanani besiphelo WebP bube ngaphantsi kakhulu. I-480p WebP eyenziwe kwi-4K MP4 incinci nge-16x kwidiski kune-4K WebP. Ukutywina kuphathwa kwi /trim/ okanye /crop/ inkqubo yokuhamba yenyathelo ehlukileyo phambi kokuguqulwa.