MP4 → WebP

Vula kulo mdlali, thola isikhathi futhi uqaphele ikhodi lesikhathi, ngoba MP4 ayikho i-node ejwayelekile yokukhomba. Chofoza ku-start-time field, ngeza isikhathi, futhi umguquli uthola kuleyo ndawo futhi uthola ikhodi kuphela lendawo oyifunayo. Ukuthola kulungile kwifreyimu, kodwa kungalungile kuphela njengenani elinikezwayo — hlola ngokubheka ngaphambi kokudlulisa kwi-clip ende. I-MP4 isekela kuphela ifomu elilodwa lesihloko esihlonishwa kakhulu (mov_text), futhi umsindo we-multi-track awuthembeki ngaphandle kwama-players wedesktop.

Ngokuyinhloko ulungele ukuqondiswa. A MP4 yifayela le-ISO base-media, futhi le mindeni irekhoda ukujikeleza njengeflegi ebhokisini ngaphezu kokujikeleza ama-pixels — ngakho-ke iclip ethweswe phansi ngefoni ingabonakalela ekudlaleni futhi ihlale ecaleni layo elinye. Ukuphila kukhiwa kusuka kuma-pixels aqoshiwe, ngakho-ke i-flegi kufanele ihlolwe ngaphambi kokuba ifreyimu yokuqala ibhalwe; uma ukubukela kuqala kubuyela emuva, jikelezisa umsuka futhi uyiguqule futhi. Konke okuthile mayelana nekhamera noma umhleli wokurekhoda kuyinkinga elula: i-video track eyodwa, umsinga owodwa oqinile wefreyimu. Kuyinto encane kakhulu ukuthi wonke ama-MP4 aphilayo ayizividiyo ze-H.264 ezinesandi se-AAC; isiqoqi sigcina ngokusemthethweni i-HEVC, AV1 ne-VP9.

Yebo, uma unefayela lakho. I MP4 yilokho i-web esebenzisayo ngevidiyo engaphakathi kwelayini ngokucacile ngoba iziphequluli zidlala ngaphandle kweplugin, ngakho-ke i-clip edlalayo kwi-tab ivame ukuba yi-MP4 elula egcina futhi ikhuphula lapha njengenoma iyiphi enye ifayela. Ukukhishwa kuyisidlali esisakazayo esinikeza iziqephu ezincane ezinamanani ngaphezu kwefayela elilodwa — lezi zidinga ukubuyiselwa emuva ngaphambi kokuba noma yini iguqulwe. Ilungelo liyinto ehlukile efanele ukubheka: ukukwazi ukufaka ividiyo akuyona into efanayo negunya lokushicilela kabusha i-animation eyenziwe kuyo. MP4 yindawo ephephile yokufinyelela ekhona — yonke ifoni, i-browser, i-console, umhleli ne-Smart TV eyenziwe eminyakeni eyisithupha edlule idlala ngaphandle kwesoftware engeziwe.

Ukulahleka, nganoma yini eqala njengevidiyo. I-WebP ephilayo ingafaka ifreyimu yayo ngendlela eyodwa noma enye: indlela engalahleki igcina wonke ama-pixel futhi ilungele izithombe ezicacile kanye nombhalo we-screen, ngenkathi indlela elahlekile isebenzisa ukubikezela okusekelwe ebhodini lohlobo lwe-codec yevidiyo esebenzisayo futhi ilungele i-footage engokoqobo. Ifreyimu yekhamera igcwele i-grain encane ne-gradients ukuthi ukucindezela okungalahleki akutholakali kunoma iyiphi imodeli, ngakho-ke i-animation engalahleki yevidiyo erekhodiwe ingasebenza izikhathi eziningi ubukhulu be-lossy one ebukekayo. Yishiye ilahlekile ngaphandle kokuthi umsuka ube ukurekhodwa kwe-screen kwe-text crisp. I-WebP ihlala iyisikole sesithathu ngaphandle kwesiphequluli — ukuphrinta komsebenzi, ama-Office adala futhi ezinye izimboni zefoni azikwazi ukuwuvuma.

I-animated WebP isize ama-clip angaphansi kwamasekondi angama-10. Okude kunalokho futhi i-output ikhula ngokushesha — i-GIF ayicindezelwanga-nge-frame, ngakho-ke ngisho nama-clip aphansi asebenza kuma-megabytes amaningi. I-animations ende, i-target animated WebP noma APNG, zombili zicindezela njenge-codecs yevidiyo yamanje.

I-GIF ephilayo ku-480p, imiphumela ejwayelekile yi-2-8 MB ngokuya ngezinkinga zokushaya. I-WebP ephilayo esinqumweni/umgangatho ofanayo, cabanga u-200 KB kuya ku-1 MB — i-WebP ephilayo isebenza kahle kakhulu kune-GIF ngekhwalithi yokubuka efanayo. I-WebP inikeza izimo ezilahlekile nezingenalahlekile, ngokukhanya kwe-alpha nokubukeka okutholakalayo kunoma yikuphi.

Ngephutha sikhuphula isampula ku-15 fps ye-GIF ephilayo (i-GIF isebenza kahle kakhulu ngaphezu kuka-25 fps kulabo ababukeli abaningi) kanye no-24 fps ye-WebP / APNG ephilayo (ephatha ama-rate aphezulu kahle). Ukhetho lwe-frame-rate ludlula iphutha ukuze lugcine i-rate yomsuka kusuka ku MP4 yakho uma umbukeli wakho olindelekile uxhasa lokhu.

Akunalutho — amafomethi WebP aphilayo (GIF, WebP, APNG) agcinanga umsindo ngaso sonke isikhathi. Uma ufuna umsindo nge-clip yakho, bheka ibhokisi levidiyo (MP4, WebM, MKV) endaweni ye-WebP. Ama-embeds amaningi emphakathini (Twitter, Discord) aguqula ukuthunyelwa kwe-MP4 zibe ama-loops wokudlala ngokuzenzakalela we-GIF-style, akunika wena okungcono kwezimbili.

Yebo - isinqumo sokubala isixhumi silawula ukuthi ngabe i WebP ixhuma ngokugcwele (iphutha), idlala izikhathi N, noma idlala kabili futhi i stop. Ukubalwa kwesixhumi kugcinwa ku WebP i-metadata yesihlungi futhi kuhlonishwa yinoma iyiphi imbonisi yamanje, isiphequluli sewebhu, kanye ne-embed surface.

Izizathu ezimbili ezivamile: ukuncipha kwesampula yefreyimu-rate (sisusa i-30 fps MP4 kuya ku-15 fps GIF ngokuzenzakalela — sicindezela i-freyimu-rate option ukubuyisela ubuhle) kanye ne-palette quantification (i-GIF iphele kuma-256 amamibala ngefreyimu, engeza ama-gradients ngendlela ehlukile ku-MP4 okuqala akwenzenga). Guqula isiphetho ku-WebP ephilayo ukuqinisekisa umbala ophelele.

Yebo — ukhetho lokushintsha ubukhulu lukhuphula isingeniso ngezansi ngaphambi kokukhipha ifreyimu, okunciphisa kakhulu ubukhulu besikhathi esidlule WebP. I-480p WebP eyenziwe kusuka ku-4K MP4 incane ngama-16x ku-diski kune-4K WebP. Ukunqunywa kuphathwa nge- /trim/ noma /crop/ isikhashana esihlukile sokuqhuba ngaphambi kokuguqulwa.