MPG → PNG

Sinthani Yanu MPG ku PNG mafayilo mosavuta

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Kukweza

Momwe mungasinthire MPG ku PNG

Gawo 1: Kwezani yanu MPG mafayilo pogwiritsa ntchito batani lomwe lili pamwambapa kapena pokoka ndi kugwetsa.

Gawo 2: Dinani batani la 'Convert' kuti muyambe kusintha.

Gawo 3: Tsitsani pulogalamu yanu yosinthidwa PNG mafayilo

MPG ku PNG Mafunso Ofunsidwa Kawirikawiri Okhudza Kusintha kwa Anthu

Kodi ndingagwiritse ntchito ma frame amodzi kuchokera ku MPG ngati PNG zithunzi?

Kutsitsa fayilo ya MPG ndi wosinthira amatulutsa chisankho cha frame-extraction: chilichonse cha Nth frame, ma frame panthawi yofunikira, kapena chiwonetsero chimodzi pasecond.Katundu uliwonse wosankhidwa umasunthidwa kuchokera ku MPG video stream, amasinthidwa kukhala fayilo ya PNG yosiyana, ndipo imaphatikizidwa ngati ZIP yotsitsa. MPG ndi chimodzimodzi MPEG pulogalamu mtsinje monga.mpeg - atatu-alemba kuwonjezeka ndi DOS-era kugwa, si mtundu wina. PNG anapangidwa mu 1996 monga patent-free kuchotsa kwa GIF, ndi anayamba webusaiti default lossless chithunzi mtundu.

N’chifukwa chiyani ma frame anga ochokera m’mabuku ali ndi ma liwiro ozungulira omwe amapita mwa iwo?

Chifukwa cha zomwe zimachokera. MPG zomwe zili ndi zofalitsa ndi DVD zimasunga madera awiri apakati pa chipinda, zomwe zimatha kuwonetsedwa ndi chikwi chachiwiri, ndipo chosatha chosatha chikuwonetsa kuti chimapangidwa mogwirizana ndi chosatha pa chilichonse chomwe chikuyenda. Kukhazikitsa deinterlacing pambuyo potulutsa ndi chilichonse chosatha chimapangidwa kuchokera ku chipinda chokha chosatha chosatha.

Kodi ndingapeze ma frame a PNG osagwiritsa ntchito mawu oyamba?

Ngati MPG siyimagwiritsa ntchito, chifukwa MPG siyimagwiritsa ntchito mawu osakira omwe angasankhidwe kuti azimitsa. Chomwecho MPG chikuwonetsa pazenera ndi chithunzicho, choncho ndicho chilichonse PNG chotulutsa chimapanga ndipo palibe chosankha chomwe chimachotsa pambuyo pake. Mukapeza fayilo yosiyana ya mawu osakira pamodzi ndi kanema, chotsani kuchokera kuzinthu zomwe zidatenga ma frame awiri osiyana. MPG amalandira zonse MPEG-2 kuletsa - heavy bitrate, interlacing, palibe soft subtitle - kuphatikizapo kusokonezeka kwa awiri zowonjezera kwa mtundu wina.

Kodi PNG imathandizira kuwala?

Format imagwira ntchito, koma chiyambicho sichimakhala ndi alpha kuti ipereke - ma frame a video ndi masamba opangidwa ndi mawonekedwe owoneka bwino, kotero kuti ma pixel onse amafika molimba. Chingwe cha alpha chimakhala chothandiza pambuyo pake: kumatanthauza kuti mutha kuchotsa chinthu kuchokera ku PNG pambuyo pake popanda kusintha mtundu. PNG ndi kusankha koyenera kwa zithunzi, malogo, line art ndi chilichonse ndi zosalimba mapiko kapena kuwala - palibe kuyimba, palibe kuwala band.

Kodi ndi chiyani chofunikira pa PNG mafayilo?

Kukula kwakukulu kuposa momwe mungayembekezere, chifukwa PNG imasunga ma pixel onse moyenera kuposa kuyerekezera. 1080p imakhalabe pafupi ndi 2-5 MB ndipo 4K imakhalabe pafupi ndi 6-15 MB, kotero kutulutsa kwanthawi yayitali kumawonjezera mwachangu. Izi ndi malonda abwino pamene zithunzi zimatha kutulutsa kuwongolera, ndipo zoyipa pamene zikuyenda mozungulira patsamba la webusaiti. PNG amagwiritsa ntchito DEFLATE kusamvana pa scanlines zofiltered, choncho aliyense pixel amapulumuka moyenera, kuphatikizapo 8-bit alpha channel.

Kodi ndi yankho liti lomwe limatuluka PNG zithunzi zosadziwika?

Kuwala kofanana ndi choyamba MPG: 1080p MPG kumabweretsa 1920x1080 PNG ma frame, 4K MPG kumabweretsa 3840x2160 PNG ma frame. Wosinthayo sasintha kapena kuchepetsa - ma pixels amachokera pa frame yosinthidwa. Musanagwiritse ntchito /resize-image/ ngati mukufuna zithunzi zochepa.

Kodi ndingagwiritse ntchito chilichonse cha MPG ngati PNG?

Ndino, koma ganizirani kuchuluka kwa fayilo - 30 fps 1-mphindi MPG imapanga 1,800 PNG mafremu. Timawapaka m'chigawo chimodzi cha ZIP mwamsanga. Kwa mavidiyo ochepa, yesani "1 pa mphindi" (60 mafremu pa mphindi) kapena kusankha nthawi yoyenera. Ora la MPG pa mafremu onse lidzapanga ~100,000 PNG zithunzi.

Kodi PNG ma frame adzasunga MPG kujambula kwa mtundu?

Ndikoyenera - mtundu umasinthidwa ndi mapangidwe omwewo omwe amapezeka patsamba la MPG (BT.709 kwa HD, BT.2020 kwa 4K HDR). Mafuta a HDR amasinthidwa ku SDR pamene akugwiritsidwa ntchito ku PNG omwe sangathe kusungira ma pixel a HDR mwanjira yachibadwa (JPG, PNG-8).

Kodi ndi chiyani chosapanga dzimbiri chosapanga dzimbiri PNG pa diski?

Kutengera pa resolution ndi PNG codec kusankhidwa: 1080p PNG frame ndi 2-5 MB yopanda kusowa, 1080p JPG pa 85 quality ndi 200-500 KB. Kuwonjezeka kwa mitengo ya frame kuti muchepetse ZIP - pamapeto pake, kutulutsa kwa PNG kwa 10-1080p MPG kwa 10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-10-1

Kodi PNG yosakira imasunga metadata ya EXIF ya kamera?

MPG chonyamula sichimangokhala ndi EXIF pa frame momwe kamera ikugwirira ntchito, kotero mafayilo a PNG amatuluka ndi ma blocks EXIF opanda pake. Wosintha amagwiritsa ntchito `creation_time` field yomwe imasonyeza nthawi yoyambira ya frame, kuti muthe kubwezeretsa bundle m'njira yoyenera kapena kugwirizana ndi masamba a subtitle / chapter.

Kodi nthawi yayitali bwanji kuti mutenge chiwonetsero cha MPG mpaka PNG?

Kusintha kwa frame ndi kosavuta - nthawi zambiri 20-30% ya nthawi yochokera. 5-mphindi MPG -> PNG bundle imatha m'miphindi 1 popanda kutengera kuti ndi mapazi angati omwe mumasankha, chifukwa chingwe ndi PNG encoder kulemba mafayilo ambiri ochepa mofanana, osati MPG demuxer.

Kodi ndingagwiritse ntchito ma frame panthawi yoyenera m'mavidiyo a MPG?

Ndiyo — njira yowonjezera ya timestamp imavomereza mndandanda wogawidwa ndi koma (mwachitsanzo `00:01:23, 00:05:00, 00:10:42.5`) ndipo imapanga fayilo imodzi PNG pa timestamp. Ndikothandiza kwa thumbnails ya chapter, zithunzi zokhudzana ndi scene, kapena kulenga bokosi la mauthenga kuti lifufutidwe.

MPG

MPG ndi fayilo yowonjezera ya mafayilo amakanema a MPEG-1 kapena MPEG-2. Nthawi zambiri amagwiritsidwa ntchito posewera ndi kugawa makanema.

PNG

PNG mafayilo amagwiritsa ntchito kuwala kwazithunzi ndi kuchepetsa kuwala kwazithunzi, zomwe zimawapangitsa kukhala abwino kwa zithunzi, malogo, ndi zithunzi zazithunzi.