MP4 vs WAV
MP4 thiab WAV yog ob hom ntaub ntawv siv hauv khoos phis tawj, khaws cov ntaub ntawv tawm. Lawv tau tsim nyob rau xyoo 1990's thiab thaum ntxov 2000's, tab sis tseem yog cov ntaub ntawv tawm suab nrov. MP4 yog siv rau ob lub suab thiab yees duab thaum WAV tsuas yog siv tau rau suab.
MP4
MP4 yog hom ntawv ntim cov ntaub ntawv tsim los ntawm Moving Pictures Experts Group rau International Standards Organization, thiab nws yog raws li QTFF. Qhov tseeb qhov kev tso tawm thawj zaug ntawm hom ntawv yog ze li zoo ib yam rau QTFF. Tseem lawv muab cov qauv zoo ib yam, tab sis MP4 tau txav mus rau ncua sij hawm thiab tsim rau hauv lub thawv siab dua. Tam sim no nws yog ib feem tseem ceeb ntawm ISO hauv paus xov xwm cov ntaub ntawv hom qauv.
Widely used data streams in the MP4 file format is MPEG-4 Part 10 (H.264) and MPEG-4 Part for video and Advanced Audio Coding for audio streams. Sub titles siv MPEG-4 Timed Text cov ntaub ntawv ntws.
Txij li thaum pib txoj kev loj hlob raws li QTFF, ntau tus qauv ntawm MPEG-4 yog tib yam. Hauv Apple ib puag ncig (MacOS lossis iOS), cov ntaub ntawv no tuaj yeem siv sib hloov. Cov ntaub ntawv hom tuaj yeem hloov pauv yam tsis tau rov encoding video. Lub MP4 muaj qhov zoo ntawm kev muaj peev xwm tshaj tawm hauv internet thaum QTFF tsis txhawb qhov no. Tsis tas li ntawd, MP4 yog txaus siab los ntawm feem ntau ntawm cov OS platforms thiab video editing software. Cov zej zog nyob ib ncig ntawm tus qauv tau loj hlob, thiab kev koom tes los ntawm cov zej zog tau ua kom muaj kev vam meej ntawm tus qauv hauv kev lag luam; qee yam QTFF tsis txaus siab vim nws qhov muaj tswv.
MPEG4 cov ntaub ntawv siv.mp4 txuas ntxiv, tab sis nyob ntawm daim ntawv thov txuas ntxiv siv yuav txawv. Piv txwv li cov ntaub ntawv suab nkaus xwb tuaj yeem siv.m4a txuas ntxiv. Raw MPEG4 video ntsis kwj yog muab lub.m4v extension. Cov ntaub ntawv video tawm tswv yim siv hauv cov xov tooj ntawm tes kuj yog kev txhim kho los ntawm MPEG4-12, thiab lawv siv.3gp thiab.3g2 txuas ntxiv. Cov phau ntawv suab siv.m4b txuas ntxiv vim qhov hloov pauv hauv cov cai tso cai rau bookmarking cov ntaub ntawv suab.
WAV
WAV lossis Waveform Audio File Format yog ib hom ntaub ntawv tsim los ntawm Microsoft thiab IBM rau PCs, thiab nws yog qhov muab los ntawm Microsoft Resource Interchange File Format (RIFF). Txoj kev no khaws cov ntaub ntawv tawm raws li cov ntaub ntawv chunks. Cov ntaub ntawv WAV feem ntau yog RIFF cov ntaub ntawv nrog ib qho "WAV" chunks uas muaj ob lub chunks hu ua fmt thiab cov ntaub ntawv. WAV yog cov hom ntaub ntawv tseem ceeb siv hauv windows raws li software rau lub suab zoo.
WAV yog hom ntawv tsis muaj ntaub ntawv; Yog li ntawd, tsis muaj compression ua tiav thaum lub sij hawm encoding ntawm cov ntaub ntawv kwj hauv linear mem tes code modulation. Raw thiab uncompressed suab ntaub ntawv feem ntau generated nyob rau hauv WAV hom nyob rau hauv lub qhov rais. Nws tuaj yeem hloov kho thiab kho tau yooj yim, thiab cov kws tshaj lij nyiam WAV kom zoo dua. Txawm hais tias nws qhov kev siv tseem ceeb li cov thawv ntim cov ntaub ntawv uas tsis tau ntim, WAV tuaj yeem tuav cov suab compressed ib yam nkaus, compressed los ntawm Windows Audio Compression Manager.
Vim vim tsis muaj cov ntaub ntawv encoding, WAV cov ntaub ntawv zoo li loj; yog li ntawd, tsis yog hom ntaub ntawv nrov rau kev hloov hauv internet. Txawm li cas los xij, nws tseem nrov vim nws qhov yooj yim thiab zoo.
MP4 vs WAV
• MP4 thiab WAV yog ob hom ntaub ntawv tawm tswv yim. MP4 tuaj yeem muaj ob lub suab thiab yees duab, thiab ntxiv me ntsis ntws xws li ntawv nyeem. WAV yog hom ntaub ntawv audio.
• MP4 yog tsim los ntawm Moving Pictures Experts Group (MPEG) ntawm ISO thaum WAV yog tsim los ntawm Microsoft thiab IBM.
• MP4 yog raws li Quick Time File Format, thiab nws yog tus qauv kev lag luam. WAV yog ib qho derivation los ntawm Microsoft RIFF thiab pib ua tus tswv hom. Tab sis tom qab ntawd nws tau dhau los ua tus qauv kev lag luam vim nws muaj koob meej.
• MP4 yog hom ntaub ntawv lossy siv compression thaum lub sij hawm encoding. WAV yog hom ntaub ntawv lossless thiab siv linear pulse code modulation format. Yog xav tau, compressed suab siv tau rau hauv WAV cov ntaub ntawv, tab sis nws tsis yog ib qho kev xyaum.
• Vim cov ntaub ntawv compression, MP4 cov ntaub ntawv me dua piv rau WAV. Tab sis WAV muaj qhov zoo dua.
• cov ntaub ntawv MP4 yog siv rau hauv cov ntaub ntawv hloov pauv hauv internet thaum WAV cov ntaub ntawv tsis tshua siv rau tib lub peev xwm vim tias cov ntaub ntawv loj dua.
