MP4 ku M4R Mafunso Ofunsidwa Kawirikawiri Okhudza Kusintha kwa Anthu
Kodi ndingagwiritse ntchito bwanji mndandanda wa audio kuchokera ku MP4 ngati M4R?
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Kutsitsa fayilo ya MP4 ndipo wosintha amachotsa mpweya wa audio kuchokera ku MP4, kenako amasintha kukhala M4R. Mavidiyo amatulutsidwa - palibe kanema wachiwiri, palibe kuwonongeka kwabwino kuposa zomwe M4R codec imayambitsa. MP4 ndi ISO / IEC 14496-14, standardized mu 2001 ndi anachokera pamodzi QuickTime katundu layout MOV ntchito. M4R ndi iPhone ringtone - a oyera AAC wapamwamba mu MP4 chidebe ndi kuwonjezeka anasintha kuti iTunes zigawo izo monga tonse.
Kodi kusinthira MP4 ku M4R ndi gawo lachiwiri la kutsitsa kwa lossy?
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Ndikukhulupirira kuti ndinu oyenera, ndipo ndibwino kuti mupange. Mafomu awiriwa ndi owonongeka, choncho M4R encoder akuchita ntchito kuchokera ku audio yomwe yakhala ikuyenda mwa psychoacoustic pass, ndipo masankho ake oyamba amapanga gawo loyamba. Pa 192 kbps kapena pamwambapa, zotsatirazi ndizosawoneka bwino kwa ambiri owerenga. Ngati muli ndi master yopanda kuwonongeka, kulemba koyamba kwa M4R kuchokera ku yomwe imalepheretsa kupitanso koyamba. Zikuoneka kuti pafupifupi aliyense MP4 m'munda ndi H.264 kanema ndi AAC audio; chidebenso mwalamulo ali HEVC, AV1 ndi VP9. Payload ndi AAC, conventionally capped pa 40 masekondi, amene ndi m'mimba mwake iOS adzavomereza.
Kodi chimachitika ndi ma audio ambiri a multichannel pamene amasintha MP4 ku M4R?
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Idzaikidwa pansi pa stereo, chifukwa M4R siyimakhala ndi njira yogwiritsira ntchito ma channel ambiri. Kulowetsa kumagwiritsa ntchito ma coefficients ovomerezeka kuti ma channel apakati azikhala owoneka bwino ndipo ma surrounds amaphatikizidwa pamalingaliro otsika. Chomwecho chilichonse chomwe chimadalirika pa malo osiyanasiyana a ma channel chimapita pamene izi zikuchitika. M4R ndi Apple-khama ndi m'lifupi zokwanira; chilichonse kuposa 40 masekondi ndi chisoni anakana ndi foni.
Kodi nyimbo ya audio imatulutsidwa pamene MP4 yanga ili ndi zambiri?
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Poyambira, mpweya 0 (woyamba wa nyimbo, nthawi zambiri ndi woyamba kuphatikizidwa). Ngati MP4 wanu ali ndi mawu ofotokoza, ma dubbing, kapena mawu ofotokoza pa nyimbo zina, wosankha "mpweya wa nyimbo" akukulola kusankha 1, 2, 3... mwatsatanetsatane. Lipoti la nyimbo limawonekera pa mndandanda woyang'anira kuti musasankhe mwamsanga.
Kodi bitrate imagwiritsa ntchito fayilo ya M4R?
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Default M4R bitrate ndi 192 kbps (wowoneka bwino kwa nyimbo kwa amayi ambiri). Kusintha kwa 320 kbps kwa audiophile output, kapena 96-128 kbps kwa mawu / podcast komwe fayilo yaying'ono ndi yoyamba. Ma M4R opanda malire (WAV, FLAC) sasamala za kukhazikitsa kwa bitrate ndikusunga zonse.
Kodi kuchoka ku MP4 kupita ku M4R kumachepetsa mtundu wanga wa audio?
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Ngati M4R ndi mtundu wopanda kuwonongeka (WAV, FLAC, ALAC), zonse zomwe zimapangidwa zimasungidwa. Ngati M4R ndi zowonongeka (MP3, AAC, OGG, Opus), codec imabwezeretsa - pa 192 kbps kusiyana kumakhala kopanda kudziwika kwa zinthu zambiri; pa 96 kbps mutha kunena kuti ma cymbals kapena ma sibilants amawoneka. MP4 yokhala ndi MP4 siyikhudza izi - zosankha za codec ndizofunikira.
Kodi M4R yosakira imasunga MP4 kuchuluka kwa satifiketi?
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Mwa default yes — 48 kHz MP4 audio imakhala 48 kHz M4R audio, 44.1 kHz imakhala 44.1 kHz. Ngati mukufuna kuchepetsa kusamvana kwa kugwirizana (mwachitsanzo, 96 kHz studio masters ku 44.1 kHz CD-quality M4R) mndandanda wolowetsa wa sampling-rate amachita izi ndi kusamvana kwabwino.
Kodi ndingagwiritse ntchito M4R audio kuchokera ku fayilo ya MP4?
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Yai - chotsani fayilo ya MP4 ku gawo lotsitsa ndipo tidzachita kutulutsa mofanana. Premium imalandira ogwira ntchito ambiri mofanana; pa fayilo ya 100 (kusonkhanitsa kwa nyimbo za nyimbo) iyi ndi kusiyana pakati pa masekondi a 90 ndi maola a 8.
Kodi ndi nthawi yayitali bwanji kuti mutenge M4R kuchokera ku 1-hour MP4?
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Audio demux + transcode imayenda mwachangu kuposa kubwezeretsa kanema - nthawi zambiri 5-15% ya nthawi yoyambira. 1-hour MP4 -> M4R imatha m'maola 3-9 pa standard pipeline. Ngati M4R codec imagwirizana ndi codec yoyambira yomwe ili mu MP4 (yofala kwa AAC m'ma MKV / MP4), ndi remux yoyera ndipo imagwira ntchito m'masekondi.
Kodi fayilo ya M4R idzakhala ndi dzina / woimba / ma tag a album?
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Ngati fayilo ya MP4 imasunga metadata ya stream (mlengi, mutu, album), timakopera masambawa ku M4R komwe mtundu umathandizira ma tag. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC / M4A), RIFF INFO (WAV) onse amalemba. Opanda ma tag MP4 amapanga M4R osadziwika - kugwiritsa ntchito Mp3tag kapena Picard kutumiza kunja kuti muwonjezere.
Kodi MP4 yanga ndi yapadera panthawi yochotsa audio?
Nchifukwa chiyani M4R yanga ili ndi zitseko zosadziwika kapena zosayenera?
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Pa nthawi zambiri, index ya stream siyigwirizana - MP4 yanu ili ndi maudindo ambiri a audio ndipo tatulutsa ulalo wosayenera (mwachitsanzo, ulalo wofotokozera mawu osalankhula m'malo mwa ulalo wophatikizidwa). Yambitsaninso ndi "audio stream" yosinthidwa yosinthidwa ndi index yoyenera, kapena kusankha "all streams" kuti mutenge ulalo uliwonse ngati fayilo yosiyana ya M4R.
