Convert MP4 to AMR — Free Online Converter
Convert MPEG-4 Part 14 (.mp4) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
O převodu MP4 na AMR
MP4 to AMR conversion extracts the audio track from an MPEG-4 video and encodes it in Adaptive Multi-Rate format. AMR was developed by the European Telecommunications Standards Institute (ETSI) specifically for cellular voice calls over GSM and 3G networks. It operates at extremely low bitrates (4.75 to 12.2 kbps) and is optimized for human speech rather than music or general audio.
Our converter decodes the MP4 audio and re-encodes it using the AMR-NB (Narrowband) codec at 8 kHz mono. The resulting file is tiny — a 10-minute recording produces an AMR file under 1 MB.
Proč převádět MP4 na AMR?
AMR conversion makes sense when you need to extract voice content from video for telephony applications, voice messaging systems, or legacy mobile platforms. Many older VoIP systems, IVR (Interactive Voice Response) systems, and cellular voicemail platforms use AMR as their native format. If you are building content for distribution on 2G/3G networks where bandwidth is precious, AMR's extreme compression is unmatched. The format excels at speech intelligibility even at its lowest 4.75 kbps rate.
Běžné případy použití
- Extract voiceover from training videos for use in IVR phone systems