Convert M4V to AMR — Free Online Converter
Convert MPEG-4 Video (Apple) (.m4v) 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
M4VからAMRへの変換について
M4V files carry H.264 video and AAC audio in Apple's MPEG-4 container, while AMR (Adaptive Multi-Rate) is a narrowband voice codec designed for GSM cellular networks. AMR operates at just 4.75-12.2 kbps with an 8 kHz sampling rate, making it one of the most bandwidth-efficient audio codecs in existence. Converting M4V to AMR extracts the audio, downsamples it dramatically, and encodes it for voice-oriented applications on cellular networks.
M4VをAMRに変換する理由
AMR is the standard voice codec for GSM and 3G cellular systems worldwide. Converting M4V audio to AMR is necessary when you need to create voice messages, ringtones for legacy phones, or audio clips for MMS delivery over cellular networks. The extreme compression reduces file sizes to roughly 1 KB per second of audio, making it viable for the most bandwidth-constrained scenarios.
主な活用例
- Creating voice messages from M4V video recordings for MMS delivery
- Extracting dialogue for use as voice memos on legacy mobile devices