M4A ali AAC audio mu MP4 chidebe ndi zimene iTunes ndi Apple Music kugwiritsa ntchito kwa downloaded nyimbo.
Ntchito Zofala
iTunes music
Audiobooks
Podcast episodes
M4A Mafunso Ofunsidwa Kawirikawiri Okhudza Kusintha kwa Anthu
Kodi ndi M4A audio wapamwamba?
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M4A ndi lossy audio mtundu. The encoder amachotsa inaudible mafrequencies ndi masked maganizo kuti afike kukula kwa fayilo pafupifupi theka la uncompressed equivalent. Re-encoding M4A kuti wina lossy mtundu amachititsa kuwonongeka kwa kapangidwe generational; kusintha kuchokera lossless mkulu pamene ndi kotheka. M4A ndi First-class Apple audio mtundu ndi ndi default kwa ambiri iOS mapulogalamu kuphatikizapo Voice Memos ndi Music app.
Kodi kuchuluka kwabwino kwatha kuwonongeka m'fayilo ya M4A?
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M4A compresses ndi modeling zimene nkhope sadzaona - chisoni maganizo ozungulira pansi olimba, ma frequencies pa malire a kumvetsera - ndi mwamsanga kuchotsa izo. Pa bitrate bwino kuti ndi inaudible kwa pafupifupi aliyense. zimene sizosatheka ndi reversible, kotero kusintha kuti lossless mtundu amateteza dziko latsopano kuposa kubwezeretsa oyambirira. M4A ali AAC m'malamulo ambiri, kapena Apple Lossless (ALAC) pamene anachokera ku lossless rip.
Popeza foni imalemba chilichonse chomwe chimapanga chip chake mu hardware, ndipo M4A ndi chomwe chimapangidwa ndi silicon. Kamera ya kamera siyifunsa - imalemba mtundu womwe chipangizocho chimatha kupanga panthawi yomaliza yomaliza popanda kuwala. Kusintha pambuyo pake ndi koyenera ndipo sichiwononga chilichonse pamtundu ngati musankha chida chomwe chimasunga ndalama zofanana. M4A ndi MP4 chidebe kunyamula audio okha, ndipo ndi zimene iTunes, Apple Music ndi iPhone Voice Memos app kupanga.
Kodi woimba, album ndi kusindikiza kwa M4A anga adzakhala ndi kusintha?
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Amachita zomwe mtundu wofunikira uli ndi malo omwe angawaike. M4A amayendetsa ma tag ndi mapangidwe ophatikizidwa ngati gawo la fayilo, ndipo kusintha kumakopa pamalo onse omwe amamvetsetsa. Ma targets opanda kulumikizana ndi chiwopsezo - adafotokozedwa pambuyo polemba kuti kulemba kwachikhalidwe ndi kuyembekezera koyenera ndipo samangokhala ndi chilichonse, kotero buku losinthidwa ndi njirayi limafika ngati mchenga wa nyimbo zopanda dzina.
Kodi fayilo ya M4A ingagwiritsidwe ntchito ndi 5.1 surround mix?
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Yes — format imagwira bwino ntchito ndi ma channels ambiri kuposa awiri, kotero kuti surround mix imasunga ma channels ake ophatikizidwa m’njira yoyenera, osati kuikidwa mu stereo. Kodi mumamva ngati surround kumadalira pa mbali ya mbali: wolandirayo adzachotsa ma channels onse, foni idzalowetsa ma sounds pa nthawi yosewera, ngakhale. Kusintha kwa stereo format imachititsa kuti ma channels azikhala ophatikizidwa m’njira yoyenera.
Kodi M4A idzasewera mobwerezabwereza patsamba la webusaitiyi?
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Ndikukhulupirira. M4A ndi imodzi mwamaudindo a audio omwe mabrowser amagwiritsa ntchito, motero amatha kutulutsidwa m'mawu a audio kapena wosewera podcast ndipo amagwira ntchito kumapeto kwa mafoni popanda plugin kapena fayilo ya fallback. Izi zimapangitsa kuti zikhale zotetezeka zofalitsa, ndipo chifukwa chake kusinthira kujambula kwa exotic ku mtunduwu ndi njira yofupikitsa kuti ikhale yosewera patsamba. M4A amasunga rich iTunes-style metadata, zigawo ndi ntchito zojambulajambula osatha, ndi ndi asilikali audio mtundu pa zonse Apple chipangizo.
Kodi ndimafunikira Mac kuti ndichite ntchito ndi M4A mafayilo?
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No. The mtundu anatuluka Apple ndi zimene zake zipangizo ndi mapulogalamu kupanga mwa default, koma mavidiyo okha ndi osiyana ndi kuphunzira bwino kumeneko ndi choyenera chida. Kusinthanitsa pano chimachitika pa seva, kotero palibe QuickTime kukhazikitsa, palibe Apple hardware ndi palibe platform-osiyana codec pakiti ndi kukhudzana kulikonse m'njira.
Kodi ndiyenera kusintha bwanji mafayilo anga a M4A?
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Kugwirizana ndi malo osankhidwa, si cholinga. Kwa nyimbo, 256 mpaka 320 kbps ndi zosaoneka kwa aliyense womvetsera; kwa mawu ndi podcasts, 96 mpaka 128 kbps ndi zambiri ndipo amadula fayilo ku theka. Kulemba mawu kudzera pa ma bitrate ochokera kumawononga malo - amasunga mawu omwe kale apita ku lossy pass ndipo sabwezeretsa chilichonse chomwe chimatulutsidwa ndi wolemba mawu woyamba.
Ndi M4A lossy kapena lossless?
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M4A ndi lossy - encoder amachotsa deta encoder akatswiri kuti akhale inaudible kuti afike m'lifupi wapamwamba kukula. M4A amachititsa zinthu ziwiri kwambiri zosiyana m'mbuyo mwa m'modzi kuwonjezeka - lossy AAC ndi lossless ALAC - ndi non-Apple hardware thandizo ndi zosagwirizana.
