MP4 → GIF

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.

Akukho — a GIF iyifayela lesithombe, ngakho iqala ngesikhathi ikhishwa futhi ayihambisani nokudlala, ukuyeka noma ukulawula okugqwala nganoma yikuphi. Lokhu kuyinto yefomethi ngaphezu kwekhasi elihlala kulo, futhi yilokho okubangela ukuthi ifreyimu yokuqala ibaluleke kakhulu lapha kunalokho okuzokwenzeka kwividiyo: abafundi abacela ukuhamba okuncishisiwe, nabangani be-imeyili abaveza ifreyimu eyodwa kuphela, bona lefreyimu futhi akukho okuningi. Khetha indawo yokuqalisa lapho ifreyimu yokuvala ifunda khona ngokunengqondo.

I-animated GIF 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-GIF ayilahleki kodwa iphele kumbala we-256-palette ngefremu ngayinye, usebenzisa ukucindezeleka kwe-LZW nombala owodwa ocacile.

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 GIF 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 GIF sixhuma ngokugcwele (isiphutha), sidlala izikhathi N, noma sidlala ngokugcwele kabili. Ukubalwa kwesixhumi kugcinwa kwi GIF i-metadata yesihlungi futhi kuhlonishwa yinoma iyiphi imboniso yamanje.

Izizathu ezimbili ezivamile. Okuqala, ukuncipha kwesampula yefreyimu-rate: 15 fps GIF 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 GIF. I-480p GIF kusuka ku-4K MP4 incane ngama-16x kuna-4K GIF. Sebenzisa /video-cutter/ ukugoqa ngenyathelo elilodwa.