MP4 ku MP2 Mafunso Ofunsidwa Kawirikawiri Okhudza Kusintha kwa Anthu
Kodi ndingagwiritse ntchito bwanji mndandanda wa audio kuchokera ku MP4 ngati MP2?
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Kutsitsa fayilo ya MP4 ndipo wosintha amachotsa mpweya wa audio kuchokera ku MP4, kenako amasintha kukhala MP2. Mavidiyo amatulutsidwa - palibe kanema wachiwiri, palibe kuwonongeka kwabwino kuposa zomwe MP2 codec imayambitsa. MP4 ndi ISO / IEC 14496-14, standardized mu 2001 ndi anachokera pamodzi QuickTime katundu layout MOV ntchito. MP2 ndi MPEG-1 Audio Layer II, latsopano la MP3 ndi MP3 ndi mtundu wa audio standard kwa DVB ndi DAB kufalitsa.
Kodi kusinthira MP4 ku MP2 ndi gawo lachiwiri la kutsitsa kwa lossy?
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Ndikukhulupirira kuti ndinu oyenera, ndipo ndibwino kuti mupange. Mafomu awiriwa ndi owonongeka, choncho MP2 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 MP2 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. MP2 ndi lossy koma amagwiritsa ntchito zosatheka filterbank kuposa MP3, nthawi zambiri ntchito pa 192 mpaka 384 kbps.
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 MP2?
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Default MP2 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 MP2 opanda malire (WAV, FLAC) sasamala za kukhazikitsa kwa bitrate ndikusunga zonse.
Kodi kuchoka ku MP4 kupita ku MP2 kumachepetsa mtundu wanga wa audio?
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Ngati MP2 ndi mtundu wopanda kuwonongeka (WAV, FLAC, ALAC), zonse zomwe zimapangidwa zimasungidwa. Ngati MP2 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 MP2 yosakira imasunga MP4 kuchuluka kwa satifiketi?
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Mwa default yes — 48 kHz MP4 audio imakhala 48 kHz MP2 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 MP2) mndandanda wolowetsa wa sampling-rate amachita izi ndi kusamvana kwabwino.
Kodi ndingagwiritse ntchito MP2 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 MP2 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 -> MP2 imatha m'maola 3-9 pa standard pipeline. Ngati MP2 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 MP2 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 MP2 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 MP2 osadziwika - kugwiritsa ntchito Mp3tag kapena Picard kutumiza kunja kuti muwonjezere.
Kodi MP4 yanga ndi yapadera panthawi yochotsa audio?
Nchifukwa chiyani MP2 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 MP2.
Chilankhulo cha Channel chimatsatira MP4 mwa default: 5.1 MP4 audio stream imapanga 5.1 MP2 komwe codec imathandizira (AAC, FLAC, OGG, Opus). Chosankha cha channel-downmix chimafuna stereo kapena mono - chothandiza kwa ntchito ya podcast kapena kugwirizana ndi ma speakers a Bluetooth a mono.
