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 isebenza kahle kakhulu kuma-clip angaphansi kwamasekondi angama-10. Ngaphesheya kwalokhu amafayela aqala ukushaya (i-GIF ivame ukucindezelwa nge-frame ngayinye). Izithombe eziphilayo ezide zidinga i-animated WebP noma i-APNG, zombili zisebenzisa ukucindezelwa kwevidiyo-codec-grade futhi zilinganiselwe kahle kakhulu.

I-GIF ephilayo: 2 kuya ku-8 MB ku-480p ngokuya ngezinkinga zokushayela. I-WebP ephilayo: 200 KB kuya ku-1 MB ku-resolutio / quality efanayo. I-WebP ephilayo i-5 kuya ku-10x ingcono kune-GIF ku-quality ebonakalayo efanayo. I-WebP inikeza izimo ezilahlekile nezingenalahlekile, ngokukhanya kwe-alpha nokubukeka okutholakalayo kunoma yikuphi.

Ngokungajwayelekile sikhuphula isampula ku-15 fps ye-GIF ephilayo (ibhekana ngokubona ngaphezu kuka-25 fps) kanye no-24 fps ye-WebP / APNG ephilayo (ephatha ama-rate aphezulu ngokuhlanzekile). Nciphisa nge-frame-rate option uma umbukeli wakho uxhasa i-source rate.

Akuna — amafomethi WebP aphilayo (GIF, WebP, APNG) angagcina umsindo. Uma ufuna umsindo, bheka ibhokisi levidiyo (MP4, WebM) endaweni yefomethi yesithombe esiphilayo.

Yebo - isinqumo sokubala isixhumi silawula ukuthi ngabe WebP sixhuma ngokugcwele (isiphutha), sidlala izikhathi N, noma sidlala ngokugcwele kabili. Ukubalwa kwesixhumi kugcinwa kwi WebP i-metadata yesihlungi futhi kuhlonishwa yinoma iyiphi imboniso yamanje.

Izizathu ezimbili ezivamile. Okuqala, ukuncipha kwesampula yefreyimu-rate: 15 fps WebP kusuka ku-60 fps MP4 ikhuphula i-75% yefreyimu; lungisa nge-slider yefreyimu-rate. Okulandelayo, ukulinganiselwa kwephaleti: i-GIF iphele kuma-256 amamibala futhi i-gradient-heavy MP4 i-dithers ngokubonakalayo. Tshintsha ku-WebP ephilayo ukuze kube nombala ogcwele.

Yebo — ukhetho lokushintsha ubukhulu luyihlanganiswa i-MP4 ngezansi ngaphambi kokukhipha ifreyimu, okunciphisa kakhulu ubukhulu befayela WebP. I-480p WebP kusuka ku-4K MP4 incane ngama-16x kuna-4K WebP. Sebenzisa /video-cutter/ ukugoqa ngenyathelo elilodwa.