Tshintsha M4V kuya PNG

Tshintsha M4V kuya PNG amadokhumende ngokulula

Khetha amafayela akho

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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 Ukushintsha

Ngiyisusa kanjani ifreyimu kusuka ku M4V ividiyo njenge PNG izithombe?

Layisha phezulu ihele M4V futhi umguquli ubonisa isikhethi sefremu-sokuzisusa: nganoma iyiphi ifremu ye-Nth, amafremu ezikhathini ezicacisiwe, noma ifremu eyodwa ngomzuzu. Ifremu ngayinye ekhethiwe ikhodwe njengehele PNG elilodwa futhi lihlukaniswe njenge-ZIP yokulayisha.

Ngabe isithombe esikhishwayo PNG siphuma ngesinqumo esingakanani?

Ukulungiswa okufanayo njenge M4V ividiyo — umsuka we-1080p ukhiqiza amafreyimu we-1920×1080 PNG; umsuka we-4K ukhiqiza amafreyimu we-3840×2160 PNG. Buyisela ubukhulu ngemuva kokukhishwa uma ufuna amathumbnail amancane.

Ingabe ngizokhipha yonke ifreyimu kusuka kuhele M4V njenge PNG?

Yebo, kodwa qaphela ngokubalwa kwefayela — i-30fps 1-minute video ikhiqiza amafreyimu angu-1,800. Siwafaka ngokuzenzakalela kwi-ZIP archive. Ukusebenzisa ama-clip ade kakhulu sebenzisa "1 per second" (60 frames) noma ama-timestamps athile.

Ingabe izithombe PNG zizogcina umbala M4V olinganiselwe?

Yebo — umbala uqokwa nge-matrix efanayo esetshenziswa umsuka M4V (BT.709 ku-HD, BT.2020 ku-4K HDR). Umsuka we-HDR u-tone-map ku-SDR uma ukhishwa ku-PNG (i-PNG / JPG ayikwazi ukugcina ama-pixels we-HDR ngokujwayelekile).

Yini ubukhulu behele lwesiphequluli esisodwa esikhishwayo PNG?

Kuya ngokuthi usinqumo kanye nokhetho lwe-codec. I-1080p PNG frame yi-2-5 MB; i-1080p JPG quality-85 frame yi-200-500 KB. Ukuphindaphinda nge-frame count ukuze usize i-ZIP — ku-extreme, yonke-frame extracting of a 10-min 1080p video at PNG is ~50 GB.

Ingabe i-PNG ekhishwayo igcina ikhamera EXIF metadata?

I M4V iqoqo aligcinanga i-EXIF yefreyimu 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.

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

Ukukhishwa kwefremu kushesha - 20-30% yosuku lokusuka ku-standard pipeline. Iminithi engu-5 M4V → PNG iqoqo liphele ngo-1 min ngaphandle kokulinganiselwa kwefremu, ngoba i-bottleneck yi-PNG encoder, hhayi i-demuxer.

Ingabe ngizokhipha amafreyimu ezikhathini ezikhethekile kwi M4V ividiyo?

Yebo - ukhetho oluthuthukisiwe luyamukela uhlu oluhlukaniswe nge-comma lwesikhathi sesikhathi (isibonelo `00:01:23,00:05:00,00:10:42`) futhi lukhiqiza ihele elinye PNG ngesikhathi sesikhathi. Kuhle kuma-thumbnails wesigaba noma izikhangiso zokubhekisa.

Ingabe i-M4V yami yevidiyo ifihlakele ngesikhathi sokukhipha ifreyimu?

Yebo — imodeli yobumfihlo efanayo nezo zonke iziguqulo. Ividiyo yomthombo kanye nefreyimu ekhishwayo iphathwa abasebenza ngokuzimela futhi isuswa ngaphakathi kwemizuzu.

Kungani amafreyimu ami akhishwayo PNG amnyama?

Kuyinto evamile ukushaya umsindo ovela emthonjeni M4V (ikhamera ihamba lapho ifreyimu ithathwa). Zama ukukhetha ama-timestamps kusuka emibonweni ehlala njalo, noma khipha amafreyimu ambalwa azungeze futhi ukhethe ocacile. Ipayipi alikhiqizi ucacile.

Ingabe le thuluzi lixhasa ukukhishwa kwefremu eyodwa ngeshintsho lendawo yokubukela?

Ayikho emfushaneni oyinhloko - sebenzisa "1 ngomzuzwana" njengenketho efana nokulinganiselwa, bese ukhetha ngokubonakalayo amafreyimu oshintsho lwesizinda. Umqolisi okhethekile wokuthola isizinda ukhona kwindlela yokuhamba.

Ingabe ngisebenzisa amafreyimu akhishwayo PNG ngokuhweba?

Yebo, ngaphansi kwelayisense elawula umsuka M4V. Ushintsho lwefomethi alukho ubufakazi — sifaka akukho phawu lwamanzi futhi sicela akukho bufakazi belayisense ku PNG.

M4V

M4V is a popular file format.

PNG

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