Opus → M4A

Heoi, ā, e tika ana te whakarite i te taha. He ngaro nga āhuahira e rua, nā reira ko te M4A encoder e mahi ana mai i te oro, kua puta kētia e tētahi whakawhitinga psychoacoustic, ā, ko ōna whakataunga anō e whakakotahi ana i te tautuhi tuatahi. I te 192 kbps, i runga ake rānei i te hua, he mārama tonu te hua mō te nuinga o te whakarongo. Mēnā kei a koe tētahi māngai kore ngaro i tētahi wāhi, ka whakakōrerotia te M4A mai i tērā, ka kore e taea te whakawhiti i te whakawhitinga rua katoa.

192 kbps te pūtake mō te ngaro M4A; whakawhitinga mō te kore ngaro M4A. Whakapae ki te 320 kbps mēnā e hiahiatia ana e koe te pūmautanga ngaro tino nui, 128 kbps mō te tuaritanga podcast-ki te rahi, 96 kbps rānei mō ngā pūtake reo- anake e nui ake ai te nui o te faila iti iho i te taipitopito o te whare karakia.

Mēnā he ngaro te Opus (MP3, AAC) ā, he kore ngaro te M4A (WAV, FLAC), kāore te M4A i te pai ake i te Opus — kāore e taea e koe te whakaora i ngā mōhiohio kua whakakoretia e te codec ngaro Opus. Mēnā he kore ngaro te Opus ā, he ngaro te M4A, e tūmanako ana te M4A whakakōrero kia whakawhāiti anō; i te 192 kbps kāore e mōhiotia te ngaro ki te nuinga o ngā oro.

He — ko te taitara, te kaitapere, te pūrākau, te tau, te tau rererangi, te toi pūrākau, te BPM, te whiwhinga whakahōu e ako ana mai i te Opus me te tuhi ki ngā āpure ōrite i runga i te M4A. ID3v2 (MP3), ngā kōrero Vorbis (OGG, FLAC), ngā ngota MP4 (AAC, M4A), RIFF INFO (WAV), iXML ngā wāhanga katoa o te mahere mārama. Ko te M4A he pūrere MP4 e mau ai te oro anake, ā, ko te mea e whakaputaina ana e iTunes, Apple Music me te taupānga iPhone Voice Memos.

He — Ka tangohia tētahi pūranga o ngā pūranga Opus ki roto, ā, ka tukatuka i a rātou. He nui ake ngā kaimahi taurite o te Premium, ā, kāore he tauine tauine-whakahaere, nā reira ka oti te rōpū 500-file i roto i ngā minu, kaua i ngā tekau minu. Ka tiakina te hanganga pūranga i te huaputa ZIP.

Mā te pūmau, ā, (48 kHz Opus e whakaputa ana i te 48 kHz M4A, he 44.1 kHz Opus e whakaputa ana i te 44.1 kHz M4A). Mō te ōritetanga tauwhāiti — hei tauira, te whakaiti i ngā māngai whare taupuni 96 kHz ki te 44.1 kHz M4A mō te whakairo CD, te whakapiki rānei i te 22 kHz te karere reo ki te 44.1 kHz M4A — ka hoatu te whakaiti o te ōrite tauira ki te whakarerekētanga āhua SOX-ki te āhua.

He — ka hoatu e te kōwhiringa pūnoa-pūnoa te pūnoa ITU-R BS.1770 / EBU R128 ki te huaputa M4A, e ūnga ana ki -14 LUFS (paerewa rerenga), -16 LUFS rānei (paerewa podcast), he uara rānei o te tangata. Ka whai hua ina tahuri ngā whakarerekētanga pūnoa me ngā taumata whakahaere rerekē ki tētahi pūrākau pūoro kotahi M4A.

Ka whakapāpāho te MP3 i ngā pūrere katoa i hangaia i ngā tau e 20 kua hipa. Ka whakapāho te AAC i runga i te Apple, i te nuinga o te Android, i te Sonos, i ngā pūrere o nāianei. Ka whakapāho te FLAC i runga i te Sonos me te Android o nāianei, he iti iho te pai i ngā iPods tawhito. Ka whakapāho te WAV i ngā mea katoa engari he nui te faila. Ka kōwhiria e te whakapāho-whāinga pūrere tētahi pūrere haumaru M4A mō te pūnaha e tautuhia ana e koe. Ka pupuri te M4A i ngā metadata āhua iTunes, ngā wāhanga me ngā mahi toi, ā, ko te āhua oro māori i runga i ngā pūrere Apple katoa. E rua nga mea rerekē e whakawāteatia ana e M4A i muri i tētahi whakaroanga — AAC ngaro me ALAC kore ngaro — ā, kāore te tautoko ā-Apple i te ōrite.

He — e whakaata ana ngā pūranga Opus i whakarewaina i roto i ngā kaimahi motuhake, ā, ka tangohia i roto i ngā minu. Kāore anō tātau ki te whakataetae, ki te penapena, ki te tiritiri rānei i ngā ihirangi oro. Ka haere te pūtautau i runga i ngā pūrere e whakahaeretia ana e tātau i te mutunga ki te mutunga; kāore he ratonga tuatoru e whiwhi ana i tō koe.

Ko te kōaro-kōrero ōrite (hei tauira, AAC i roto i M4A -> AAC i roto i MP4): 10-30 sekone. He huringa kōaro (hei tauira, FLAC -> MP3, WAV rānei -> AAC): i te nuinga o te 10-20% o te roanga pūtake, nō reira ko te 1-ora Opus -> M4A e whakamutu ana i roto i ngā minu 6-12 i runga i te pūtautau.

Kāore he huringa whiwhinga ā-māori mēnā kāore te kōwhiringa pūnoa i whakahohetia. Mēnā e mārama ana ki tētahi neke taumata, ka taea e tōna kaiwhakaari oro, te puna pāpāho rānei te hoatu i te ReplayGain, i te pūnoa-pātahi rānei i te whakateretanga - whakakore i taua mea, ā, ko te M4A he oro ōrite ki te Opus (mō te kore ngaro), he ōrite rānei ki te āhua (mō te ngaro mārama).