3GP → JPG

Guqula Eyakho 3GP 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 3GP kuya JPG

Isinyathelo 1: Layisha eyakho 3GP 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

3GP kuya JPG Imibuzo Evame Ukubuzwa Yokuguqulwa

Ngiyikhipha kanjani ifreyimu ngayinye kusuka ku 3GP njenge JPG izithombe?

Layisha phezulu ihele 3GP futhi umguquli ubonisa isikhethi sefreyimu-sokukhipha: nganoma iyiphi ifreyimu ye-Nth, amafreyimu ezikhathini ezicacisiwe, noma ifreyimu eyodwa ngesekondi. Ifreyimu ngayinye ekhethiwe ikhishwa ku-3GP umsinga wevidiyo, ibhalwe njengehele JPG elilodwa, futhi iqoqwe njenge-ZIP yokulayisha ngezansi. I-3GP iyibhokisi le-3GPP elijwayelekile lefoni ephathekayo, lapho ividiyo idinga ukuhambisana ne-176x144 screen ne-2G data plan. I-JPG iyisimo se-JPEG esijwayelekile kusukela ngo-1992, futhi ngemuva kweminyaka emithathu ihlala iyisimo esisetshenziswa amakhamera amaningi namanye amawebhusayithi asebenzisa ama-photos.

Ingabe ngithola ama-JPG amafreyimu ngaphandle kwesihloko esingezansi?

Uma nje i 3GP ayizange itshetshezwe, ngoba 3GP ayinaso isingeniso esikhethiwe sohluzo esikhethiwe sokuvala. Noma yini e3GP ebonisa esigabeni isithombe, ngakho i JPG ngayinye ikhiqiza ukukhishwa futhi akukho sinqumo esisusayo ngemuva. lapho ihele elihlukile lesihloko likhona eduze kwevidiyo, khipha kusuka emthonjeni ogcina ama-2 ahlukene futhi ama-frames aphuma ahlanzekile. I-3GP iphele ngezinhlamvu eziphansi kanye nesandi sokukhuluma esisezingeni eliphansi; ukuphakama kwayo ngeke kubuyisele imingwane engazange ithathwe.

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 izithombe ezikhishwayo JPG ziphuma khona?

Isinqumo esifanayo njengesisuka ku 3GP: 1080p 3GP ikhiqiza amafreyimu angama-1920x1080 JPG, 4K 3GP ikhiqiza amafreyimu angama-3840x2160 JPG. Umguquli awukhuphuli noma awukhuphuli isampula — ama-pixel alinganiselwa ngokuqondile kusuka ku-frame e-decoded. Sebenzisa /resize-image/ ngemuva kokukhishwa uma ufuna amathumbnails amancane.

Ingabe ngizokhipha ifreyimu ngayinye ye 3GP njenge JPG?

Yebo, kodwa qaphela inani lefayela - i-30 fps 1-minithi 3GP ikhiqiza amafreyimu angama-1,800 JPG. Siwafaka ngaphakathi kohele olulodwa lwe-ZIP ngokuzenzakalela. Kweziclips ezide, khetha "1 ngesekondi" esisetshenzisiwe (amafreyimu angama-60 ngomzuzu) noma khetha ama-timestamps athile. Ihora lama-3GP nganoma iyiphi ifreyimu lizokhiqiza izithombe ezingu-~100,000 JPG.

Ingabe ama-JPG amafreyimu azogcina umbala 3GP wokuhlanganiswa?

Yebo — umbala uqokwa nge-matrix efanayo etholakalayo 3GP umsuka we-stream ubonisa (BT.709 for HD, BT.2020 for 4K HDR). Ama-HDR asuka ku-tone-mapped ku-SDR uma ekhishwa ku-JPG angagcina ama-HDR pixel ranges ngokusemthethweni (JPG, PNG-8). Cindezela i-high-bit PNG-16 noma i-TIFF uma ufuna ukugcina ubukhulu obubanzi be-dynamic range.

Ingabe incane ifreyimu ekhishwayo JPG kwidiski?

Kuxhomekeka kusinqumo kanye nokukhetha kwe-JPG codec: ifreyimu ye-1080p PNG iyisi-2-5 MB engalahleki, i-1080p JPG esezingeni le-85 iyisi-200-500 KB. Yandisa ngokubalwa kwefreyimu ukuze usize i-ZIP — ekugcineni, ukukhipha i-PNG ngayinye yefreyimu yemizuzu engu-10 1080p 3GP kulinganiselwa ku-50 GB futhi kuhlukaniswe ngezi-ZIPs eziningi.

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

I 3GP i Container ayihambisani ne-EXIF ye-frame ngayinye ngendlela ikhamera ehlala khona eyenza ngayo, ngakho i JPG amafayela aphuma nge-EXIF blocks engenanto. Umguquli ufaka `creation_time` indawo ekhombisa i-source frame timestamp, ngakho ungaphinde uhlela i-bundle ngendlela ye-chronological noma ulinganise nesihloko esingezansi / izihloko zezinkomba.

Ithatha isikhathi esingakanani ukukhishwa kwefreyimu kusuka ku 3GP kuya ku JPG?

Ukususa ifreyimu kushesha - 20-30% yesikhathi somthombo. Iminithi engu-5 i 3GP -> JPG iphele ngeminithi engu-1 kungakhathaliseki ukuthi ifreyimu eminingi ukhetha, ngoba ibhodlela liyi JPG encoder libhala amafayela amancane ambalwa ngokufanayo, hhayi i 3GP demuxer.

Ingabe ngizokhipha amafreyimu ngesikhathi esifanele ngaphakathi kwe-3GP video?

Yebo - isinqumo sesikhathi esiphakeme sivuma uhlu oluhlukaniswe nge-comma (isibonelo `00:01:23, 00:05:00, 00:10:42.5`) futhi sikhiqiza ihele elinye JPG ngesikhathi. Kusetshenziswa kumathumbnail esiga-nyezi, ama-shots endawo yokubhekisa, noma ukuthuthukisa ikhasi lokuxhumana lokubuyekeza.

Ingabe 3GP yami imfihlo ngesikhathi sokukhishwa kwefreyimu?

Yebo — imodeli yobumfihlo efanayo njengezo zonke iziguquli. Umsuka 3GP kanye ne-JPG ekhishwayo iqhutshwa kubasebenzi abahlukanisiwe futhi isuswa ngaphakathi kwemizuzu yokuqedwa.

Kungani ama-JPG amafreyimu ami akhishwa amnyama?

Kuyinto evamile kakhulu ukuthi ukungqubuzana kokuhamba kwe-motion kufakwe emthonjeni 3GP (ikhamera noma okuxoxwa ngawo kwahamba ngesikhathi ifreyimu ithathwa). Zama ukukhetha ama-timestamps kusuka emibonweni ehlala njalo, noma ukhiphe amafreyimu ambalwa azungeze futhi ukhethe ocacile kakhulu. Ipayipi alihlanganiseli imininingwane engasekho ku-3GP.

3GP

I-3GP iyifomethi yesitsha semultimedia eyenzelwe omakhalekhukhwini be-3G. Ingagcina idatha yomsindo nevidiyo futhi ivamise ukusetshenziselwa ukudlalwa kwevidiyo yeselula.

JPG

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