M4V → JPG

Guqula Eyakho M4V ukuba JPG iifayile ngokulula

Khetha iifayile zakho

okanye rhuqa uze ushiye iifayile zakho apha

Inkqubo ekhululekileyo: 1 IiNguqulelo/iyure · Yiya ngaphandle komda →

Guqula iifayile ezifikelela kwi-1 GB simahla, abasebenzisi bePro banokuguqula iifayile ezifikelela kwi-100 GB; Bhalisa ngoku

Iyalayisha

Indlela yokuguqula M4V ukuba JPG

Inyathelo 1: Layisha eyakho M4V iifayile usebenzisa iqhosha elingasentla okanye ngokutsala nokuwisa.

Inyathelo lesi-2: Cofa iqhosha elithi 'Guqula' ukuze uqalise ukuguqula.

Inyathelo lesi-3: Khuphela i-converted yakho JPG iifayile

M4V ukuba JPG Imibuzo Ebuzwa Rhoqo Ngokuguqula

Ndizikhuphele njani iifayili nganye kwi M4V njenge JPG imifanekiso?

Layisha phezulu ifayili M4V kwaye umguquli ubonisa umkhethi we-frame-extraction: i-frame nganye ye-Nth, i-frames kwi-timestamps ekhankanyiweyo, okanye i-frame enye ngesekondi. I-frame nganye ekhethiweyo i-decoded ukusuka kwi-M4V video stream, i-encoded njengefayili ehlukileyo ye JPG, kwaye i-bundled njenge-ZIP yokukhuphela ezantsi.

Yiyiphi i-resoluton ephuma kuyo imifanekiso ekhutshwe JPG?

Ugqibo olufanayo njengomthombo M4V: i-1080p M4V ivelisa i-1920x1080 JPG ii-frames, i-4K M4V ivelisa i-3840x2160 JPG ii-frames. Umguquli awukhuphi ubungakanani okanye awukhuphi i-sample — ubungakanani be-pixel butsalwa ngqo kwi-frame eyenziwe ukuba isebenze. Sebenzisa /resize-image/ emva kokukhupha ukuba ufuna ii-thumbnails ezincinci.

Ndingayikhupha isakhelo ngasinye se M4V njenge JPG?

Ewe, kodwa uqaphele inani lefayili - i-30 fps 1-minute M4V ivelisa i-1,800 JPG iifayili. Sizifaka kwi-ZIP archive epheleleyo ngokuzenzekelayo. Kwiiclip ezide, khetha "1 ngesekondi" emiselweyo (i-60 iifayili ngesekondi) okanye ukhethe iziqinisekiso zexesha ezikhethekileyo. Iyure ye M4V kwi-frame nganye iza kwenza ~100,000 JPG imifanekiso.

Ingaba i-JPG igcina umbala ophakamileyo we-M4V?

Ewe - umbala uguqulwa kwikhowudi nge-matrix efanayo ebonisa umthombo M4V (BT.709 ye-HD, BT.2020 ye-4K HDR). Amacebo e-HDR afana ne-tone-mapped kwi-SDR xa ekhutshwa kwi-JPG engagcinanga amanqanaba e-HDR pixels ngokusemthethweni (JPG, PNG-8). I-high-bit PNG-16 okanye TIFF i target ukuba ufuna ukugcina uluhlu olubanzi olunamandla.

Ingaba i-JPG isakhelo esikhuphiweyo sikhulu kangakanani na kwi-disk?

Kuxhomekeke kwisisombululo kunye nokhetho lwe-JPG codec: i-1080p PNG frame yi-2-5 MB engenakulahleka, i-1080p JPG kwi-quality 85 yi-200-500 KB. Yahlula nge-frame count ukuze ubungakanani be-ZIP — kwinqanaba eliphezulu, i-PNG ephuma kwi-frame nganye ye-10-minute 1080p M4V imalunga ne-50 GB kwaye ihlukaniswe phakathi kwe-ZIPs ezininzi.

Ingaba i-JPG ekhutshweyo igcina i-EXIF metadata yekhamera?

I M4V ibhokisi ayithabathanga i-EXIF yesakhelo ngasinye ngendlela ikhamera ehlala isenza ngayo, ngoko ke i JPG iifayili ziphuma zingenazinto eziqhotyoshelweyo ze-EXIF. Umguquli ufaka `creation_time` indawo ebonisa kwi-source frame timestamp, ukuze uphinde ulungelelanise i-bundle ngokulandelana kwexesha okanye uqhagamshelane nesihloko esingaphantsi / nabaphawuli besahluko.

Ithatha ixesha elingakanani ukususwa kwesakhelo ukusuka ku M4V ukuya ku JPG?

Isakhelo sokukhupha ikhowudi sikhawulezayo - ngokuqhelekileyo 20- 30% yobude bomthombo. Imini emihlanu M4V -> JPG iqela ligqiba malunga nemizuzu emi- 1 ngaphandle kokuba iframes ezininzi ukhetha, kuba ibhotile yengxowa ye JPG encoder ibhala iifayile ezininzi ezincinci ngokuthe tye, hayi i M4V demuxer.

Ndingazikhuphela iifayili kwixesha elichanekileyo elingaphakathi kwi-M4V yevidiyo?

Ewe - ukhetho oluphambili lwesiqinisekiso sexesha livuma uluhlu oluhlukaniswe nge-comma (umzekelo `00:01:23, 00:05:00, 00:10:42.5`) kwaye luvelisa ifayile enye JPG ngesiqinisekiso sexesha. Isetyenziswa kwiziqendu ezincinci, iziganeko ezibhekisa kwimifanekiso, okanye ukwakha iphepha loqhagamshelwano lokujonga kwakhona.

Ingaba i M4V yam ifihlakeleyo xa ikhutshwa isakhelo?

Ewe - imodeli yobumfihlo efanayo njengengguqulo nganye. Umsuka M4V kunye ne JPG ekhutshweyo iqhutywa kubasebenzi ababekwe ngokukodwa kwaye icinywe kwimizuzu yokuphela.

Kutheni i-JPG isakhelo sam esikhutshweyo simnyama?

I-motion blur ihlala i-baked kwi-source M4V (ikhamera okanye into ejikelezayo yayingumsebenzi xa isakhelo sathathwa). Zama ukukhetha i-timestamps ukusuka kwimiboniso ehlala ikhona, okanye uthathe ii-frames ezininzi ezidibeneyo uze ukhethe ezicacileyo. I-pipeline ayiqwalaseli inkcukacha ezingakhoyo kwi-original M4V.

Ingaba umguquli ukhetha isakhelo esinye ngasinye sotshintsho lwendawo ebonakalayo kwi M4V?

Akukho kutyibiliko olusisiseko - sebenzisa "1 ngomzuzwana" omiselweyo njengentsingiselo ecacileyo kwaye ujonge ngokubonakalayo i-bundle yezinto eziguqukayo zendawo. I-scene-detect extractor ekhethekileyo (isebenza nge-ffmpeg select=gt(indawo)) ikwi-roadmap kwaye izakuwela kwi-JPG yorhwebo lwangaphandle kamva kule nyanga.

Ndingasebenzisa i-JPG isakhelo esikhutshweyo ngokurhweba?

Ewe, ngokuxhomekeke kwilayisensi elawula umthombo M4V umxholo. Ukuguqulwa kukutshintsha kwefomati - ilungelo lokushicilela kwizinto eziquletheyo lihlala nomnini wayo kwi M4V. Sidibanisa akukho phawu lwamanzi, akukho phawu olufakelweyo, kwaye sicela akukho layisensi ngaphezulu kwe JPG iqela.

M4V

I-M4V yifomati yefayile yevidiyo ephuhliswe nguApple. Iyafana neMP4 kwaye iqhele ukusetyenziselwa ukudlala ividiyo kwizixhobo zeApple.

JPG

Iifayili ze-JPG zisebenzisa ukucinezela okulahlekileyo okulungelelanisiweyo kwiimifanekiso, zibonisa ubungakanani befayili encinci ngelixa zigcina inqanaba elibonakalayo.