MP4 → WebP

Vula kumdlali, fumana ixesha kwaye uqaphele ikhowudi yexesha, kuba i 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), 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 kwelinye. 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 omnye wevidiyo, umsinga omnye ozinzileyo 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 zidityaniswe kwakhona 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.

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 lufumana akukho mzobo, 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 isebenza kakuhle kwiiklipi ezingaphantsi kwee-10 zeesekondi. Ngapha koko iifayili zijikeleza (i-GIF ibalulekile kwi-frame nganye engacinezelwanga). Kwii-animations ezide injongo i-animated WebP okanye APNG, zombini zisebenzisa i-video-codec-grade compression ne-scale engcono kakhulu.

I-GIF ekhoyo: 2 ukuya kwi-8 MB kwi-480p kuxhomekeke kunzima kokuhamba. I-WebP ekhoyo: 200 KB ukuya kwi-1 MB kwisisombululo esifanayo / ubunjani. I-WebP ekhoyo 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-15 fps ye-GIF ephilileyo (isebenza kakuhle ngaphezulu kwe-25 fps) kunye ne-24 fps ye-WebP / APNG ephilileyo (ephatha i-rate ephezulu ngokucocekileyo). Nciphisa nge-frame-rate option ukuba umbonisi wakho uxhasa i-source rate.

Hayi — iifomati eziboniswayo WebP (GIF, WebP, APNG) azigcinanga isandi. Ukuba ufuna isandi, misela isiqulathi seefayili sevidiyo (MP4, WebM) endaweni yefomati yomfanekiso obonisiweyo.

Ewe - ukhetho lokubala iilophu lulawula ukuba i WebP iilophu iphela (imiselweyo), idlala i-N amaxesha, okanye idlala ngokuchanekileyo kabini. Ubalo lwelophu lugcinwa kwi-WebP i-metadata yesiqulathi seefayili kwaye luhlonishwa ngumbukeli wonke wexesha elidlulileyo.

Izizathu ezimbini eziqhelekileyo. Eyona, ukunyuka kwesampulu ye-frame-rate: 15 fps WebP ukusuka kwi-60 fps MP4 ikhupha i-75% ye-frames; lungisa nge-frame-rate slider. Eyona, ukunyuka kwesampulu yengqokelela yezixhobo: i-GIF imiselwe kwimibala engama-256 kunye ne-gradient-heavy MP4 dithers ngokubonakalayo. Tshintsha kwi-WebP eyenziweyo yobuxoki obupheleleyo bombala.

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