WebM → GIF

Vula kulo mdlali, thola isikhathi futhi uqaphele ikhodi lesikhathi, ngoba WebM 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. WebM ilungile encane noma kuphi ngaphandle kwe-browser - ama-video editors, amafoni 'ama-galleries asekhaya nama-Smart TVs ahlala engaziboni.

A WebM yi-Matroska-family container, futhi le mindeni igcina ibhokisi ne-codec ngokuhlukile—ihele ligcina lokho okuhlobene nento ebhalwe futhi alikho emqoka nge-extension. Umguquli ufaka ikhodi noma yini etholayo emuva ku-frames amnyama kuqala, futhi ama-frames afana nanoma iyiphi i-codec ekhiqiza. Ukufaka ikhodi kuthatha imali engafani: ama-codecs amasha, asebenza kahle kakhulu athatha isikhathi eside ukukhishwa kunalawo adala, ngakho-ke amafayela amabili WebM anesikhathi esifanayo angathatha isikhathi esihlukile ukufinyelela ku-GIF. WebM idinga ukucophelela: VP8 noma VP9 ividiyo (AV1 manje) nge Vorbis noma Opus umsindo, futhi akukho okuthile okuningi.

Yebo, uma unefayela lakho. I WebM yilokho i-web esebenzisayo ngevidiyo engaphakathi kwelayini ngokucacile ngoba iziphequluli zidlala ngaphandle kweplugin, ngakho-ke i-clip edlalayo kwi-tab ivame ukuba yi-WebM 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. I-WebM idlala ngokusemthethweni kuwo wonke umsakazi omusha ngaphandle kweplugin, ngaphandle kwelayisense yemali kanye nokungabonisi kwepatent, okuyenza ibe yiphutha levidiyo efakwe kwi-web.

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 WebM ikhuphula i-75% yefreyimu; lungisa nge-slider yefreyimu-rate. Okulandelayo, ukulinganiselwa kwephaleti: i-GIF iphele kuma-256 amamibala futhi i-gradient-heavy WebM i-dithers ngokubonakalayo. Tshintsha ku-WebP ephilayo ukuze kube nombala ogcwele.

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