AMR → M4A

Ya, sarta patut direncanakeun. Dua format ieu teu bisa disimpen, jadi encoder M4A damel tina audio anu geus disimpen ku hiji pass psychoacoustic, sarta kaputusanana sorangan ngagabungkeun set kahiji. Dina 192 kbps atawa leuwih hasilna masih transparan pikeun kabéh anu ngadangu. Upami anjeun gaduh master tanpa kaleungitan di mana waé, ngaenkoding M4A ti éta ngahindarkeun pass ganda sacara lengkep. AMR nyaéta kodek basa narrowband anu dioperasikeun antara 4.75 lan 12.2 kbps, modeling saluran vokal manusa tinimbang spektrum audio lengkap. M4A ngandung AAC dina kabéh kasus, atawa Apple Lossless (ALAC) nalika asalna ti rip lossless.

Sabab hiji sisi tina éta nyaéta kodeu basa, lain kodeu musik. Ieu ngamodelkeun saluran sora manusa sarta ngaleupaskeun sagala di luar bandwidth telepon, anu saé pikeun memo sora sarta ngabahayakeun pikeun sagala anu nganggo instrumen. Ngarobah jauh ti éta henteu tiasa ngareset frékuénsi anu kaleungitan - aranjeunna henteu pernah dikodekeun di awal. AMR ngarusak musik: bandwidth 8 kHz-na ngaleungitkeun sagala anu di luhur frekuensi telepon, sareng henteu aya jumlah re-encoding anu ngabalikeunana deui.

Upami AMR mangrupa lossy sarta M4A mangrupa lossless (misalna MP3 → WAV), M4A teu leuwih alus ti AMR — anjeun teu bisa ngareset informasi anu geus dibuang. Upami AMR mangrupa lossless sarta M4A mangrupa lossy, codec M4A ngamampatkeun deui; dina 192 kbps hasilna transparan pikeun kabéh isi.

Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.

Ku pigura pigura ya — 48 kHz AMR tetep 48 kHz dina M4A. Upami anjeun kedah ngaleupaskeun sampel pikeun kecocokan (96 kHz → 44.1 kHz pikeun ngabakar CD), pilihan laju sampel bakal nerapkeun sampling deui kualitas luhur dina léngkah pangénkodan anu sami.

Not in this step. The converter has no loudness setting and leaves the level as it is. To even out the volume, run the finished M4A through a Normalize tool on this site.

MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. FLAC plays on Sonos and Android but not on older iPods, and WAV plays on nearly everything but makes large files. There are no device presets on this page, so choose the target format your player supports. M4A ngajaga metadata, bab, sarta karya seni iTunes-style anu rikat, sarta mangrupa format audio asli dina sagala alat Apple. M4A ngandung dua hal anu béda di tukangeun hiji ekstensi — lossy AAC jeung lossless ALAC — sarta dukungan hardware non-Apple henteu konsisten.

Yes. Uploaded AMR files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted M4A are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.

It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.