AVI to AMR Converter

Extract AVI Audio to AMR: What This Tutorial Covers

AMR is the speech codec mobile networks use, and converting an AVI soundtrack into it is a deliberate trade: you throw away the video, then compress the audio down to something built for talking, not listening. This walk-through covers the two AMR flavours the tool offers, how to pick a bitrate mode, what the output will and will not sound like, and the errors people hit. If you simply want the audio out of an AVI at ordinary quality, stop here and use AVI to MP3 instead — AMR is for the cases where a phone, voicemail system or telephony platform demands a .amr file.

How to Convert AVI to AMR

1. Upload Your AVI File: Drag the .avi onto the page or click "+ Add Files" to pick it from your computer. Several files can be queued and they convert with the same settings.
2. Pick the Audio Codec: Open Advanced Options and choose between AMR Narrow Band and AMR Wide Band under Audio Codec. Narrow band is the classic telephone-grade .amr almost every device expects; wide band doubles the sample rate and sounds noticeably clearer, at the cost of compatibility.
3. Set the Bitrate Mode and Trim (Optional): Under File Compression, switch to Constant Bitrate and pick a Preset — the list changes to match your codec, from 4.75 KBPS up to 12.2 KBPS for narrow band. Audio Channel is fixed at MONO and Audio Sample Rate to the one rate your codec allows. Use Trim to export just a start-and-duration window.
4. Convert and Download: Click "Convert" and save the .amr. Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours — no sign-up, no watermark.

AMR Narrow Band vs AMR Wide Band

Both are defined for file storage by RFC 4867 (April 2007), which is where those two header signatures come from — a detail that matters more than it sounds, because a player written for narrow band only will refuse a file that starts with #!AMR-WB even though the extension is identical.

Walk-through: Picking a Bitrate Mode

AMR has no stereo mode and no high-frequency mode; the codec has already decided most of what your file will sound like before you touch anything. The bitrate preset is the one lever left, and the sensible choice depends entirely on where the file is going.

The per-minute figures are arithmetic, not estimates: AMR writes 50 frames every second, and in the 12.2 kbit/s narrow-band mode each frame is 32 bytes including its header — 1,600 bytes per second. Converting a ten-second stereo soundtrack with those settings produced a 16,070-byte file; the same clip at the 12.65 kbit/s wide-band mode produced 16,575 bytes. Neither number moves much with content, because AMR is constant-rate per mode.

Common Errors and How to Fix Them

• "The output sounds thin, warbly or muffled" — That is narrow-band AMR doing its job. Everything outside the telephone band is discarded before encoding, so music and bright audio lose most of their range. Switch to wide band if the destination allows it, or convert to MP3 or WAV instead.
• "My AMR is mono but the AVI was stereo" — There is no stereo AMR. The codec is single-channel by design, so the channels are mixed down to one. Audio Channel offers MONO only on this page for exactly that reason.
• "My phone or player won't open the file" — If you chose wide band, the file starts with the #!AMR-WB signature and narrow-band-only players reject it. Re-convert with AMR Narrow Band. On the desktop, VLC opens both.
• "The converted file is silent" — The AVI's audio stream may be missing or use a codec that did not decode. Confirm the source plays with sound, then re-run the conversion.
• "I set Trim but got the whole clip" — Trim needs both a start time and a duration; left on "Unchanged" it exports the entire soundtrack.

When This Doesn't Work

AMR is the wrong target whenever fidelity matters at all. Extracting a song, a score, a podcast or anything you plan to actually enjoy listening to will produce a file that is technically fine and aesthetically wrecked — no preset fixes that, because the band limiting happens before the bitrate is applied. DRM-protected or truncated AVI files may also fail to decode in the first place. Use AVI to MP3 when you want a small file that sounds right, or AVI to WAV when you plan to edit the audio, and reserve AMR for a voicemail system, IVR menu, MMS workflow or embedded device that names .amr explicitly.

Frequently Asked Questions

Why would anyone convert AVI audio to a format this lossy?

Compatibility, essentially never quality. Feature phones, voicemail and IVR platforms, MMS-era messaging and some embedded telephony hardware accept .amr and little else, and in those settings the tiny file size is a bonus rather than a compromise. If nothing in your chain is asking for AMR by name, it is the wrong choice and AVI to MP3 will serve you better.

Does the conversion keep any of the AVI's video?

No. AVI is Microsoft's RIFF-based container from the Video for Windows era, interleaving audio and video in one file; this conversion reads only the audio stream and re-encodes it. What you download is a speech-coded audio file with no picture and no way to recover one.

Will music or a film score survive being converted to AMR?

No. Narrow-band AMR samples at 8 kHz, which caps the reproducible audio at about 4 kHz and in practice keeps roughly the 200–3,400 Hz telephone band. Cymbals, bass and any sense of stereo image are gone. Wide band raises the ceiling to around 7 kHz, which is a real improvement on speech but still well short of what even a low-bitrate MP3 preserves for music.

Which should I choose, AMR Narrow Band or AMR Wide Band?

Choose narrow band unless you know the destination handles wide band. Narrow band is what .amr means to almost every phone and telephony system, and it is the safe default. Wide band roughly doubles the audio bandwidth and sounds clearly better on voice, but it writes a different file signature, so anything expecting classic AMR may reject it outright rather than degrade gracefully.

How much smaller is an AMR file than the original soundtrack?

Dramatically smaller — you drop the video entirely, downmix to mono, resample to 8 or 16 kHz, and then encode at a few kilobits per second. A minute of 12.2 kbit/s narrow-band AMR is about 96 KB, versus roughly 960 KB for a 128 kbps MP3 and about 10.6 MB for uncompressed CD-quality PCM. That is a factor of ten below MP3 and a hundred below WAV.

What do the mode numbers like 7.40 and 12.2 actually control?

They select one of AMR's fixed coding modes, each with its own bit allocation per 20 ms frame. Higher modes spend more bits on the speech model and sound cleaner; lower modes are rougher but smaller. What they do not change is the sample rate or bandwidth — every narrow-band mode is 8 kHz mono, so the quality spread between 4.75 and 12.2 kbit/s is much narrower than the fivefold difference in bitrate suggests.

Can I get a wide-band file with the .awb extension instead?

Not from this page — the output extension here is .amr regardless of codec, with the wide-band signature inside the file when you select AMR Wide Band. Most software identifies AMR by that header rather than the extension, so wide-band content in a .amr file is read correctly by anything that supports the codec. If a system specifically requires .awb, rename the downloaded file; the bytes are already correct.

How are my files handled and how long are they kept?

Your AVI is uploaded over an encrypted connection and converted on our servers, and both the upload and the .amr output are deleted automatically after a few hours. Nothing is shared or made public, there is no sign-up and no watermark. Because AMR output is tiny, the slow part of the job is always uploading the source video, not the conversion itself.