M4V → PNG

Guqula Eyakho M4V kuya PNG amafayela kalula

Khetha amafayela akho

noma cindezela bese ususa amafayela akho lapha

I-Free Plan: 1 Ukushintsha/ihora · Iya ngaphandle komkhawulo →

Tshintsha amafayela mahhala, Pro abasebenzisi bangaguqula amafayela amakhulu kakhulu; Bhala manje

Ukulayisha

Indlela yokuguqula M4V kuya PNG

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 PNG amafayela

M4V kuya PNG Imibuzo Evame Ukubuzwa Yokuguqulwa

Ngiyikhipha kanjani ifreyimu kusuka ku M4V ividiyo njenge PNG izithombe?

Layisha phezulu i M4V futhi umguquli ubonisa isikhethi sefremu-sokuzisusa: yonke ifremu ye-Nth, amafremu ezikhathini ezikhethekile, noma ifremu eyodwa ngesekondi. Ifremu ngayinye ekhethiwe ikhodwe njengehele PNG elilodwa futhi isethulo esigcwele siqoqwe kwi-ZIP archive yokulayisha. M4V Apple's uhlobo MP4, esetshenziswa iTunes kanye Apple TV app for movies kanye TV iziqephu. I-PNG yakhiwa ngo-1996 njengento eshintshayo engekho emthethweni ye-GIF, futhi yashintsha ibe yifomethi yesithombe esingasebenzisi iphutha ye-web.

Ingabe izihloko ezingezansi zizovela kuma-PNG amafreyimu engikhiphayo?

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

Ingabe ngizokhipha i PNG kusuka kusiqephu ngasinye se-M4V?

Akunakungathi inkinobho eyodwa, kodwa M4V yenza kube lula: amaphawu esigaba agcinwa ebhokisini njengezipho zosuku, ngakho funda uhlu lwesigaba ngaphandle kwefayela bese ufaka amahora ezindaweni zesiqephu. Uthola PNG eyodwa ngesigaba ngasinye, ngokulandelelana, okuyindlela ejwayelekile yokwakha izithonjana zokurekhoda okude. Amacebo angenamagama esigaba ashiya ukukhetha 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.

Ingabe i-PNG ixhasa ukubukhali?

Ifomethi ikhona, kodwa umsuka awuna-alpha ukuwunika - amafreyimu wevidiyo namakhasi ashicilelwe agcwele ukucasuka, ngakho wonke ama-pixel afika aqinile. Isixhumanisi se-alpha sisebenza ngemuva: kusho ukuthi ungasakaza isiqephu se PNG ngemuva ngaphandle kokushintsha ifomethi futhi. I-PNG iyisinqumo esifanele sezithombe-skrini, amalogo, umdwebi we-line kanye nanoma yini eneziphetho eziqinile noma ezicacile — akukho ukusakaza, akukho umbala obandayo.

Ingabe amafayela PNG azokhula kangako?

Okuningi kunalokho okubonayo, ngoba PNG igcina wonke ama-pixel ngokugcwele kungafani nokulinganisela. I-1080p ihlala ifinyelela ku-2-5 MB futhi i-4K ihlala ifinyelela ku-6-15 MB, ngakho-ke ukukhishwa okude kusebenza ngokushesha. Lokhu kuyibhizinisi elilungile uma izithombe zidla ukukhiqizwa okuqhubekayo, futhi okubi uma zihamba ngqo kwikhasi le-web. I-PNG isebenzisa ukucindezelwa kwe-DEFLATE phezu kwemigqa yokuskena ehlolwe, ngakho wonke ama-pixel ahlala ngokugcwele, kanye ne-8-bit alfa channel ephelele.

Ngabe usinqumo sinjani uma ifreyimu ngayinye ekhishwayo PNG iphuma?

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

Ingabe ngizokhipha ifreyimu ngayinye esuka ku M4V njenge PNG?

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

Ingabe izithombe ezikhishwayo PNG zizogcina umbala M4V olinganiselwe?

Yebo — umbala uqokwa nge-matrix esetshenziswa umsuka M4V (BT.709 ku-HD, BT.2020 ku-4K HDR). Umsuka we-HDR u-tone-map ku-SDR uma ukhishwa ku-PNG ngoba amafomethi amaningi PNG (PNG, JPG) angagcina ama-pixels we-HDR ahlukene ngokusemthethweni.

Yini ubukhulu behele lwesiphequluli esisodwa esikhishwayo PNG?

Kuxhomekeka kusinqumo kanye ne PNG codec. Ifreyimu ye-1080p PNG ivame ukuba 2 kuya ku-5 MB; i-1080p JPG esezingeni-85 ivame ukuba 200 kuya ku-500 KB; i-4K PNG ivame ukuba 6 kuya ku-15 MB. Kunzima kakhulu, ukukhishwa kwefreyimu ngayinye ye-PNG yemizuzu engu-10 1080p M4V kukhiqiza ~50 GB jikelele.

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

I M4V iqoqo aligcinanga i-EXIF nge-frame ngayinye ngendlela ikhamera ehlala isebenza ngayo, ngakho i PNG amafayela aphuma nge-EXIF engenalutho. Sifaka `creation_time` indawo ekhombisa i-source frame timestamp ukuze uphinde uhlanganise i-bundle ngokulandelelana kokuthatha.

Ingabe ithatha isikhathi esingakanani ukukhishwa kwefremu kusuka ku M4V kuya ku PNG?

Ukukhishwa kwefremu kushesha — 20 kuya ku-30% yomthombo wesikhathi sokuphila ku-standard pipeline. Iminithi engu-5 M4V → PNG iqoqo liphelela ku-minithi eyodwa noma ngabe ifremu ibalwa, ngoba i-bottleneck yi PNG encoder, hhayi M4V demuxer.

Ingabe ngizokhipha amafreyimu ezikhathini ezikhethekile ku M4V?

Yebo - ukhetho oluthuthukisiwe luthatha uhlu oluhlukaniswe nge-comma lwesikhathi (isibonelo `00:01:23,00:05:00,00:10:42`) futhi lukhiqiza ihele elinye PNG ngesikhathi. Kuhle kuma-thumbnails wesigaba, ama-scene reference shots, noma ukuthumbnailing izifundo ezide.

M4V

M4V yi Apple uhlobo MP4 ukuthi kungase kube FairPlay DRM, okuyinto okuthi ivimbela abanye abadlali kusukela ukuvula.

PNG

Amafayela e-PNG asekela ukucaca futhi asebenzisa ukucindezela okungenakulahlekelwa, okwenza afaneleke kakhulu kuma-graphics, ama-logo, kanye nezithombe-skrini.