M4V → JPG

Guqula Eyakho M4V kuya JPG amafayela kalula

Khetha amafayela akho

noma cindezela bese ususa amafayela akho lapha

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Guqula amafayela afinyelela ku-1 GB mahhala, abasebenzisi be-Pro bangaguqula amafayela afinyelela ku-100 GB; Bhalisa manje

Ukulayisha

Indlela yokuguqula M4V kuya JPG

Isinyathelo 1: Layisha eyakho M4V amafayela usebenzisa inkinobho engenhla noma ngokuhudula bese uphonsa.

Isinyathelo 2: Chofoza inkinobho ethi 'Guqula' ukuze uqale ukuguqulwa.

Isinyathelo 3: Landa i-version yakho JPG amafayela

M4V kuya JPG Imibuzo Evame Ukubuzwa Yokuguqulwa

Ngizokhipha kanjani amafreyimu kusuka ku M4V ividiyo njenge JPG izithombe?

Layisha phezulu i-M4V futhi umguquli ubonisa isikhethi sefreyimu-sokukhipha: nganoma iyiphi ifreyimu ye-Nth, amafreyimu ezikhathini ezicacisiwe, noma ifreyimu eyodwa ngesekondi. Ifreyimu ngayinye ekhethiwe ikhodwe njengehele JPG elilodwa futhi isethulo esigcwele sifakwe kwi-ZIP archive yokulayisha phezulu. M4V Apple's uhlobo MP4, esetshenziswa iTunes kanye Apple TV app for movies kanye TV iziqephu. I-JPG iyisimo se-JPEG esijwayelekile kusukela ngo-1992, futhi ngemuva kweminyaka emithathu ihlala iyisimo esisetshenziswa amakhamera amaningi namanye amawebhusayithi asebenzisa ama-photos.

Ingabe izihloko ezingezansi zizovela kuma-JPG amafreyimu engikhiphayo?

Akunakwenzeka uma beyi-subtitle track engokoqobo. M4V igcina izihloko ezingezansi njenge-stream yabo futhi umdlali uzobasusa phezu kwesithombe ngesikhathi sokudlala, ngakho ifreyimu eqoshiwe umguquli ubhala ngaphandle njenge-JPG ine-pixels ehlanzekile ngaphansi. Izihloko ezingezansi eziboshwe kwividiyo ngaphambi kokuba ibe yi-M4V ziyinkinga ehlukile — lapho ziyingxenye yesithombe futhi yonke ifreyimu ekhishwa igcina izithombe.

Ingabe ngizokhipha i JPG kusuka kusiqephu ngasinye se-M4V?

Akunakunqoba, kodwa i M4V iyenza kube lula: amaphawu esigaba agcinwa ebhokisini njengezipho zosuku, ngakho funda uhlu lwesigaba ngaphandle kwefayela bese ufaka amahora ezindaweni zesiqephu. Uthola JPG ngasinye sesigaba, ngokulandelelana, okuyindlela ejwayelekile yokwakha izithonjana zokurekhoda okude. Ama-sources anezimpawu zesigaba azishiya ukhetha izimo ngemehlo endaweni. I-M4V igcina izibonisi zesigaba, umsebenzi wobuciko kanye nezingcingo zesihloko esingezansi ngendlela i-Apple TV app elindele ngayo, okujwayelekile MP4 kuvame ukulahlekelwa.

Yini isilungiselelo sekhwalithi okufanele ngisebenzise ku-JPG?

Umgangatho 85 ulungile futhi usetshenziswa uma ungashintshanga - ubukeka ungafani nomthombo kude kakhulu, kuncane kakhulu kuncane kunesithupha sesimo esifanayo. Chofoza ku 95 nganoma yini ezoguqulwa noma iphrintwe, bese ukhuphuka ku 70 ngezithombe ezincane lapho ubukhulu bulawula khona. I-JPG ilahlekelwa yisimo: isithombe siguqulwa nge-DCT, silinganiselwe, futhi sikhonjiswa nge-entropiya, nge-nobhu wobude olawula ukuthi yini elahlekile.

Ngasiphi isixazululo siphuma kuso sonke ifreyimu ekhishwayo JPG?

Isinqumo esifanayo njenge M4V ividiyo — 1080p M4V ikhiqiza amafreyimu angama-1920×1080 JPG; 4K M4V ikhiqiza amafreyimu angama-3840×2160 JPG. Sebenzisa ukuguqula usayizi ngemuva kokukhipha uma ufuna amathumbnail amancane noma ama-social-media-size crops.

Ingabe ngizokhipha ifreyimu ngayinye kusuka ku M4V njenge JPG?

Yebo, kodwa uqaphele ngokubalwa kwefayela - i-30fps 1-minithi M4V ikhiqiza amafreyimu angama-1,800 JPG. Siwafaka ngokuzenzakalela ku-ZIP. Kweziclips ezide, "1 ngesekondi" (ifreyimu engu-60) noma ama-timestamps athile anikeza imiphumela elawulwayo.

Ingabe izithombe ezikhishwayo JPG zizogcina umbala olinganiselwe M4V?

Yebo — umbala uqoshwe nge-matrix esetshenziswa umsuka M4V (BT.709 for HD, BT.2020 for 4K HDR). Ama-HDR asuka ku-tone-mapped ku-SDR uma ekhishwa ku-JPG ngoba ama-JPG ahlukahlukene (PNG, JPG) angagcina ama-pixels we-HDR ngokusemthethweni.

Yini ubukhulu behele lwesiphequluli esikhishwayo JPG?

Kuxhomekeka kusinqumo kanye ne-JPG codec. Ifreyimu ye-1080p PNG ivame ukuba yi-2 kuya ku-5 MB; i-1080p JPG esezingeni-85 i-200 kuya ku-500 KB; i-4K PNG i-6 kuya ku-15 MB. Ekugcineni, ukukhipha i-PNG nganoma iyiphi ifreyimu yemizuzu engu-10 1080p M4V kukhiqiza ~50 GB jikelele.

Ingabe i-JPG ekhishwayo igcina i-EXIF camera metadata?

I M4V i Container ayigcinanga i-EXIF nge-frame ngendlela ikhamera ehlala isebenza ngayo, ngakho i JPG ifaka amafayela ngaphandle nge-EXIF engenanto. Sifaka i-`creation_time` field ekhombisa i-source frame timestamp ukuze uphinde uhlanganise i-bundle ngokulandelelana kokuthatha.

Ithatha isikhathi esingakanani ukukhishwa kwefreyimu kusuka ku M4V kuya ku JPG?

Ukukhishwa kwefreyimu kushesha — 20 kuya ku-30% yesikhathi somthombo ku-pipeline ejwayelekile. Iminithi engu-5 M4V → JPG iqoqo liphelela cishe ngomzuzu owodwa kungakhathaliseki inani lefreyimu, ngoba ibhodlela liyi-JPG encoder, hhayi i-M4V demuxer.

Ingabe ngizokhipha amafreyimu eziqephuni ezikhethekile zesikhathi ku M4V?

Yebo - ukhetho oluphezulu lu accepts a comma-separated list of timestamps (e.g. `00:01:23,00:05:00,00:10:42`) and produces one JPG file per timestamp. Useful for chapter thumbnails, scene reference shots, or thumbnailing long lectures.

Ingabe i-M4V yami yevidiyo imfihlo ngesikhathi sokukhishwa kwefreyimu?

Yebo — imodeli yobumfihlo efanayo nezo zonke iziguqulo. Ividiyo yomsuka kanye nefreyimu ekhishwayo JPG ziqhubekelwa ngabasebenza ngokuzimela futhi zicishwe ngaphakathi kwemizuzu; akukho kuhlolwa komuntu, akukho kuhlolwa kokuzivocavoca, akukho ukungena kwengxenye yesithathu.

M4V

I-M4V ifomethi yefayela levidiyo eyakhiwe i-Apple. Ifana ne-MP4 futhi ijwayele ukusetshenziselwa ukudlalwa kwevidiyo kumadivayisi we-Apple.

JPG

Amafayela we-JPG asebenzisa ukucindezeleka okulahlekile okuhlanganisiwe ngezithombe, okunikeza ubukhulu befayela elincane ngenkathi kugcinwa isixazululo esibonakalayo.