MP4 → GIF

Yambitsani mu wosewera, peza nthawi ndi kukumbukira nthawi, chifukwa MP4 sichimangokhala ndi zilembo za kapitoli kuti mupite. Pezani kuti mu gawo la nthawi yoyamba, wonjezera nthawi yotha, ndipo wosintha amafuna kumapeto kwa nthawiyo ndipo amachotsa malire omwe mwafunsidwa. Kufuna ndi koyenera kwa frame, koma kumatha kukhala koyenera ngati idadi yomwe imaperekedwa - onetsetsani kuti ndi yoyenera panthawi yoyamba ya kanemayo. MP4 amathandiza okha imodzi yotchuka subtitle mtundu (mov_text), ndi multi-traka audio ndi osati olimba m'mphepete mwa desiki osewera.

A MP4 ndi fayilo ya ISO base-media, ndipo izi zitha kusinthidwa ngati chiwonetsero chazithunzi mu chotengera, osati posintha ma pixels - chifukwa chake clip yomwe ikugwiritsidwa ntchito mozungulira pafoni ikhoza kuwonekera m'modzi mwa osewera ndikukhala pambali pamodzi. Animation imapangidwa kuchokera ku pixels yosinthidwa, kuti chiwonetserocho chiyenera kuvomerezedwa pambuyo polemba chiwonetsero choyamba; ngati chithunzicho chimabwerera m'mbali, sinthani malo ochokera ndikusinthanso. Zonse zina za kamera kapena wolemba wolemba ndi nkhani yovuta: kanema wa kanema, mzere wokhazikika wa ma frame. Zikuoneka kuti pafupifupi aliyense MP4 m'munda ndi H.264 kanema ndi AAC audio; chidebenso mwalamulo ali HEVC, AV1 ndi VP9.

Yai, pamene muli ndi fayiloyo. A MP4 ndi zomwe webusaitiyi imagwiritsa ntchito kwa kanema wophatikizidwa chifukwa mabrowser amasewera popanda plugin, kotero clip yomwe imasewera mu tabu nthawi zambiri ndi MP4 yokhayo yomwe imasunga ndi kutsitsa pano monga fayilo ina iliyonse. Kulephera ndi wosewera wosewera yemwe amapatsa ma segments ofupi omwe amawerengedwa m'malo mwa fayilo imodzi - omwe ayenera kusinthidwanso pambuyo poti chilichonse chitha kusinthidwa. Malamulo ndi chinthu china chomwe chimayenera kutsimikiziridwa: kutsitsa kanema sichifanana ndi kuloledwa kufalitsanso animation yomwe idapangidwa kuchokera ku izo. MP4 ndi otetezeka zotheka kutumiza zolinga - aliyense foni, browser, console, wolemba ndi Smart TV anamanga mu zaka zapitazi amasewera izo popanda mapulogalamu zowonjezera.

Sichoncho - GIF ndi fayilo ya chithunzi, ndipo imayamba nthawi yomwe imatha kusinthidwa ndipo siyimayendetsa kusewera, kuletsa kapena kuwongolera komweko. Izi ndi ziweto za mtunduwo kuposa tsamba lomwe limasungidwa, ndipo ndichifukwa chake chiwonetsero choyamba chimafunikira kwambiri pankhaniyi kuposa momwe chimakhalira pavidiyo: owerenga omwe akufuna kuchepetsa kuyendetsa, ndi maimelo omwe amatumiza mafayilo, amawona kuti fayiloyo ndi yokha. Sankhani malo oyamba omwe fayilo yoyamba imawerenga moyenera.

Animated GIF imagwira ntchito bwino kwambiri pazolemba pansi pa 10 masekondi. Kuwonjezera pa zomwe mafayilo amapanga (GIF ndizomwe zimapangidwa ndi frame). Kwa ma animations ochepa, amagwiritsa ntchito WebP kapena APNG, omwe amagwiritsa ntchito kutsitsa kwa video-codec-grade ndi kukula bwino.

GIF yokhala ndi ma animations: 2 mpaka 8 MB pa 480p malinga ndi kuvuta kwa kuyendetsa. WebP yokhala ndi ma animations: 200 KB mpaka 1 MB pamodzi ndi kuwonekera / kudalirika. WebP yokhala ndi ma animations ndi 5 mpaka 10x yothandiza kuposa GIF pokhala ndi kuwala kofanana. GIF ndi lossless koma ndi 256-color palette pa frame, pogwiritsa ntchito LZW kusamvana ndi imodzi-kolo binary kuwala.

Mwachidule timalowetsa mpaka 15 fps kwa GIF yoanima (yokhala ndi mavuto owoneka bwino kuposa 25 fps) ndi 24 fps kwa WebP / APNG yoanima (yoyang'anira bwino kwambiri). Chotsani mwa kusankha kwa frame-rate ngati woyang'anira wanu amathandizira kuchuluka kwa chiyambi.

Sichoncho — mavidiyo a GIF (GIF, WebP, APNG) sasunga mawu. Ngati mukufuna mawu, yesani kujambula kanema (MP4, WebM) m'malo mwa kujambula zithunzi zosaoneka.

Yes - njira yowerengera loop-count imawongolera ngati GIF imayenda mopanda malire (default), imasewera nthawi N, kapena imasewera nthawi imodzi. Kuwerengera kwa loop kusungidwira mu metadata ya GIF yonyamula ndipo imalemekeza aliyense woonera wamakono.

Zifukwa ziwiri zofala. Choyamba, kuchepetsa kuchuluka kwa ma frame: 15 fps GIF kuchokera ku 60 fps MP4 kumachepetsa 75% ya ma frame; kuchotsa ndi slider ya kuchuluka kwa ma frame. Chachiwiri, kuchepetsa kwa palette: GIF imathamanga mpaka ku 256 colors ndi gradient-heavy MP4 dithers.

Yes — the resize option scales the MP4 down before frame extraction, which dramatically shrinks GIF file size. A 480p GIF from a 4K MP4 is roughly 16x smaller than a 4K GIF. Use /video-cutter/ for cropping in a separate step.