WebM → AMR

Yeah, uye zvinokosha kutarisira. Mafomati maviri ari kushaya, saka encoder AMR ari kushanda kubva kune audio iyo yaive yapfuura neimwe psychoacoustic pass, uye pfungwa dzayo dzinoumba yekutanga seti. Pa 192 kbps kana kupfuura, iyo mhinduro ichiri yakajeka kune vazhinji vanonzwa. Kana iwe uine master isina kushaya chero kupi, encoding the AMR kubva kune iyo inodzivirira double pass zvakakwana. WebM isiri nyore kuisa: VP8 kana VP9 video (AV1 yapfuura) neVorbis kana Opus audio, uye hapana chimwe. AMR i narrowband speech codec ichiita pakati pe4.75 ne12.2 kbps, ichifananidza munhu wechivanhu nechivanhu, asi kwete nezvose zvinotaurwa nezvokutaura.

Ichi chinovharwa pasi kusvika kustereo, nekuti AMR haina multichannel mode. Kuparadzanisa kunoshandisa zviyero zvakajairika kuti chigaro-chigaro chinotaura chigare chakajeka uye zvinonhuwira zvinoparadzanisa pazera rakaderera. Chii zvachose chinodarika kuparadzanisa chigaro chinoiswa chiri kubuda kana ichiitika. AMR inoravira ndangariro: 8 kHz bandwidth yake inoravira zvese zviri pamusoro pefoni frequencies, uye hapana mari yekudzokorora-kunyora zvinozoidzosera.

Nekuti imwe nzvimbo yacho inonzi codec yechitaura kupfuura codec yechirongwa chemuvhi. Inoratidza pfungwa dzevanhu uye inobvisa zvese zviri kunze kwebandwidth yefoni, izvo zvinokosha kana uchida kutumira meseji uye zvinokuvadza kana uchida kutumira chero chinhu chine mainstruments. Kuchinjana kwacho hakugone kudzosera mafrequencies akaipa — havana kunyorwa mukodzero yekutanga. WebM isiri nyore kuisa chero kupi kunze kwebrowser – vanyori vemavhidhiyo, mafoni ane maganda uye Smart TVs vanoisiya pachena.

Zviri pachena kuti 0 ndiyo nhamba yekutanga (iyo yekutanga nhamba yezvinyorwa, iyo inowanzova nechikonzero chekutamba). Kana WebM yako ichitakura mashoko, dubs, kana zvinotaura zvezvinyorwa pane zvimwe zvinyorwa, iyo yakakwira "nhamba yezvinyorwa" yekutora inokutendera kuti utore 1, 2, 3... zvakajeka. Nhamba dzezvinyorwa dzinoratidzwa mukuona kwekutumira kuti urege kusarudza zvakaipa.

Zviri pachena kuti bitrate yeAMR i 192 kbps (inoratidzika zvakanaka kune vamwe vanhu). Dzvanya pa 320 kbps kana uchida kuburitsa zvemabhaisikopo, kana 96-128 kbps kana uchida kuburitsa zvemabhaisikopo/podcast. Zviri pachena kuti faira rakakura rine kukosha kukuru. Zviri pachena kuti zvirongwa zve AMR zvisina kukuvadza (WAV, FLAC) hazvisi kutevedzera bitrate uye zvinochengeta zvese zvinongedzo.

Kana AMR format iri lossless (WAV, FLAC, ALAC), ese aoriginal samples anochengetwa. Kana AMR iri lossy (MP3, AAC, OGG, Opus), codec inodzikisazve — pa 192 kbps kusiyana hakuonekwi kune zvakawanda zvemukati; pa 96 kbps unogona kunzwa cymbals kana sibilants kunonoka. WebM container haina kukonzera izvi — chete codec settings zvinokosha.

Zviri pachena kuti hapana — 48 kHz WebM audio ichange 48 kHz AMR audio, 44.1 kHz ichange 44.1 kHz. Kana iwe uchida kushambadza pasi kuti zvive zvakaenzana (e. g. 96 kHz studio masters to 44.1 kHz CD-quality AMR) iyo sample-rate dropdown inoita izvi nemhando yepamusoro yekushambadza.

Yeah — bvisa folder ye WebM mafaera mu upload zone uye isu tinotora kubvisa muparallel. Premium inowana akawanda maparallel workers; pa100-file batch (yakajairika music-video collection) iyi ndiyo kusiyana pakati pe90 masekondi ne8 maminitsi.

Audio demux + transcode inofamba nekukurumidza kupfuura video re-encoding - kazhinji 5-15% yenguva yekuburitsa. 1-hour WebM -> AMR inosvika mu 3-9 maminitsi pastandard pipeline. Kana iyo AMR codec ichienzaniswa neyakajairika codec yaive mu WebM (inozivikanwa seAAC mukati meMKV / MP4), iyi ndeye remux yakachena uye inofamba mumasekondi.

Kana iyo WebM faira ichiita metadata yemvura (mutambi, zita, album), isu tinokopa aya marudzi muAMR chigaro apo fomati inotsigira mazita. ID3v2 (MP3), Vorbis mashoko (OGG, FLAC), MP4 atoms (AAC / M4A), RIFF INFO (WAV) zvese zvakanyorwa. Untagged WebM inogadzira untagged AMR - shandisa Mp3tag kana Picard mushure mekutumira kunze kuti uwane.

Yeah — imwe chete yekuvanzika model sese conversions. Source WebM uye output AMR zvinogadziriswa muzvikwata zvakasiyana uye zvinorwadzwa mukati meminutes. We don't play, kuchengetedza, kana kugovera zvinhu.