Convert M1V to AMR — Free Online Converter
Convert MPEG-1 Video (.m1v) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration....
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How to Convert
Upload your .m1v file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .amr file when it's ready.
About M1V to AMR Conversion
M1V stores raw MPEG-1 video elementary streams — the foundational video compression standard from 1993, used in Video CDs and early digital video capture. M1V files contain only the video bitstream without audio or container metadata. AMR (Adaptive Multi-Rate) is a narrowband speech codec designed for GSM cellular networks, encoding voice at extremely low bitrates (4.75-12.2 kbps) with 8 kHz mono sampling.
Converting M1V to AMR attempts to extract audio from the M1V file and encode it for mobile voice applications. Since standard M1V files have no audio, this conversion requires non-standard .m1v files that contain muxed audio streams.
Why Convert M1V to AMR?
AMR is the native voice format for GSM mobile networks and feature phones. If audio can be recovered from an M1V file, converting to AMR creates the most compact voice-optimized file possible — ideal for MMS messages, voice memos, and ultra-low-bandwidth transmission. AMR files at 12.2 kbps are roughly 90 KB per minute.
This conversion is specifically useful for speech content. AMR is designed for human voice frequencies (300-3400 Hz) and performs poorly with music or complex audio. If the M1V source contains dialogue or narration, AMR preserves intelligibility at a fraction of the file size.
Common Use Cases
- Extracting speech from non-standard M1V files for MMS voice message distribution
- Creating ultra-compact voice clips from legacy video sources for feature phone playback
- Recovering narration audio from improperly demuxed MPEG-1 streams for voice archival
- Preparing dialogue excerpts from VCD-era content for telephony or IVR applications
- Converting recovered audio to the most bandwidth-efficient format for 2G networks
How It Works
FFmpeg probes the M1V file for audio streams. If found, it decodes the source audio (typically MP2) to PCM, resamples to 8000 Hz mono (AMR-NB requirement), and encodes using the libopencore-amrnb encoder at the selected bitrate (4.75-12.2 kbps). The 8 kHz sample rate means all audio above 4 kHz is discarded. The output is a raw .amr file with the AMR magic header. No audio means no output.
Quality & Performance
AMR-NB at 12.2 kbps produces telephone-quality audio — clear for speech but noticeably degraded for music. The 8 kHz sample rate limits the frequency range to 4 kHz, cutting out all high-frequency content. Combined with the lossy-to-lossy transcode from MP2, expect audio that is intelligible but harsh. Use the highest AMR bitrate (12.2 kbps) for the best result.
Device Compatibility
| Device | M1V | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use the maximum AMR bitrate (12.2 kbps) for the best speech clarity from the MP2 source audio
- 2Only use AMR for speech content — music and sound effects degrade severely at narrowband sample rates
- 3Probe the M1V file with FFprobe first to confirm audio exists before attempting conversion
- 4If higher quality is needed, use AAC at 32 kbps instead — it sounds dramatically better than AMR for the same purpose
- 5For feature phone compatibility, AMR-NB is safer than AMR-WB — more devices support the narrowband variant
M1V to AMR conversion is a niche path for extracting speech content from non-standard M1V files into the most compact mobile voice format. Standard video-only M1V files produce no output.