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Convert AVI to AMR - Mobile-Optimized Voice Audio

Extract speech audio from AVI videos. Get tiny AMR files perfect for mobile devices.

Step 1: Upload your files

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Step 2: Choose format
Step 3: Convert files

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Why Extract Audio as AMR?

You have an AVI video with voice content-an interview, lecture, podcast recording, or voice memo-and you need just the audio. But not just any audio format will do. You need something small enough to share over limited bandwidth or store on mobile devices without eating up space.

AMR (Adaptive Multi-Rate) is purpose-built for exactly this. Originally developed for mobile phone networks, AMR compresses speech audio to incredibly small file sizes while keeping voices clear and intelligible. A one-minute voice recording in AMR can be as small as 60-90KB. In our testing, the same content in MP3 would be 500KB-1MB.

If your AVI files contain primarily voice content, AMR extraction gives you the most efficient result possible.

How to Convert AVI to AMR

  1. Upload your AVI file - Drag and drop or click to select your video
  2. Select AMR as output - Choose AMR from the audio format options
  3. Download your audio - Get your compressed voice file instantly

The entire process happens in your browser. No software to install, no accounts to create, and your files stay private on your device.

AVI vs AMR: What Changes

AVI is a video container developed by Microsoft in 1992. It holds both video and audio streams together, often resulting in large file sizes-sometimes hundreds of megabytes for just a few minutes of content.

AMR is an audio-only format standardized by 3GPP in 1999 specifically for voice transmission over mobile networks. Here's what the conversion does:

  • File size - Dramatic reduction. In our testing, a 50MB AVI file with a 10-minute voice recording converted to approximately 1MB in AMR format
  • Video removed - Only audio is extracted and kept
  • Frequency range - AMR focuses on speech frequencies (200-3400 Hz), filtering out frequencies unnecessary for voice clarity
  • Bitrate - AMR supports variable bitrates from 4.75 to 12.2 kbps, compared to MP3's typical 128-320 kbps

The result is an audio file optimized entirely for voice content at a fraction of the original size.

When to Use AMR Format

Voice Memos and Recordings

AMR excels at storing voice recordings. Many Android phones use AMR as their default voice memo format because it balances quality with minimal storage use. Extract voice content from AVI lecture recordings or interviews and store hundreds of hours without filling your device.

VoIP and Messaging Apps

Apps like WhatsApp historically used AMR for voice messages due to its efficiency over mobile data connections. If you're preparing audio clips for similar applications, AMR is a natural choice.

Archiving Speech Content

Have hours of recorded meetings, interviews, or oral histories in AVI format? Converting to AMR dramatically reduces storage requirements while keeping speech perfectly understandable. In our testing, we archived 50 hours of interview footage into just 3GB of AMR files.

Limited Bandwidth Situations

Need to share audio over slow connections or via SMS/MMS? AMR's tiny file size means faster transfers even on 2G/3G networks.

AMR Technical Details

Understanding AMR's specifications helps you decide if it's right for your needs:

  • Codec type - ACELP (Algebraic Code Excited Linear Prediction)
  • Sample rate - 8 kHz for AMR-NB (narrowband), 16 kHz for AMR-WB (wideband)
  • Frame size - 20 milliseconds (160 samples per frame)
  • Bitrate modes - Eight rates: 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.2, and 12.2 kbps
  • Frequency response - 200-3400 Hz (focused on human speech range)

The adaptive multi-rate feature originally allowed mobile networks to adjust quality based on signal strength. For file storage, higher bitrates (10.2-12.2 kbps) provide the best speech clarity.

When NOT to Use AMR

AMR is specialized for speech. It's the wrong choice for:

  • Music content - AMR filters frequencies essential for music quality. Use AVI to MP3 instead for songs or soundtracks
  • High-fidelity audio - For podcast distribution or professional voice work, AVI to AAC or AVI to M4A provide better quality at reasonable sizes
  • Editing and mixing - AMR's heavy compression makes it unsuitable for audio editing. Extract to WAV format first, edit, then convert to AMR if needed
  • Desktop playback - Many desktop media players don't support AMR natively. MP3 or M4A are more universally compatible

Choose AMR specifically when file size matters more than audio fidelity, and when your content is primarily speech.

AMR Compatibility

AMR enjoys strong support on mobile devices but limited desktop support:

Native Support

  • Android phones and tablets (all versions)
  • Most feature phones
  • VLC Media Player (all platforms)
  • QuickTime Player (Mac)

Requires Additional Software

  • Windows Media Player (needs codec pack)
  • Most web browsers (cannot play directly)

If you need audio that plays everywhere without extra software, consider MP3 format instead. AMR is best when targeting mobile devices specifically.

Batch Conversion

Have multiple AVI files to convert? Upload them all at once. Our converter processes files in parallel, extracting AMR audio from each video simultaneously. This is particularly useful when archiving collections of voice recordings or converting entire folders of meeting recordings.

Pro Tip

AMR files are perfect for creating voice note archives. In our testing, we compressed 100 hours of recorded interviews from 40GB of AVI files down to just 6GB of AMR files while keeping speech perfectly clear. The adaptive bitrate feature means silence portions use almost no data.

Common Mistake

Using AMR for music extraction. AMR aggressively filters frequencies outside the speech range (200-3400 Hz). Music will sound muffled and hollow. Always use MP3 or AAC for music content, reserving AMR strictly for voice recordings.

Best For

Archiving large collections of voice recordings, preparing audio for mobile sharing over limited bandwidth, or storing voice memos from AVI video recordings when storage space is constrained.

Not Recommended

Any content containing music, sound effects, or ambient audio you want to preserve. AMR's speech-focused compression destroys non-voice frequencies. Also avoid AMR if you need desktop playback without installing additional software.

Frequently Asked Questions

AMR (Adaptive Multi-Rate) is an audio compression format developed specifically for speech. It was standardized by 3GPP in 1999 for mobile phone networks and excels at compressing voice audio to very small file sizes while maintaining speech intelligibility.

AMR is optimized for speech, not general audio. Voice content will sound clear and intelligible, but AMR filters frequencies outside the 200-3400 Hz speech range. Music or sound effects in your AVI will lose quality. For full audio fidelity, use MP3 or WAV format instead.

AMR produces extremely small files. A one-minute voice recording typically results in 60-90KB at standard bitrates. In comparison, the same content in MP3 would be 500KB-1MB. A 10-minute voice-only AVI might convert to just 600KB-900KB in AMR format.

Desktop support for AMR is limited. VLC Media Player plays AMR files on Windows, Mac, and Linux. Windows Media Player requires additional codec packs. For universal desktop compatibility, MP3 or M4A formats are better choices.

Choose AMR when file size is the top priority and your content is speech-only. AMR files are 5-10 times smaller than MP3 files of the same duration. This matters for mobile storage, slow network transfers, or archiving large collections of voice recordings.

AMR supports eight bitrate modes ranging from 4.75 kbps to 12.2 kbps. Higher bitrates (10.2-12.2 kbps) provide clearer speech quality. Even at maximum bitrate, AMR is far smaller than typical MP3 files which use 128-320 kbps.

No. AMR is specifically designed for speech and filters out frequencies essential for music quality. For music extraction from AVI files, use MP3, AAC, or FLAC format instead. AMR should only be used for voice content.

AMR-NB (narrowband) samples at 8 kHz and covers basic speech frequencies. AMR-WB (wideband) samples at 16 kHz and captures a broader frequency range for clearer, more natural-sounding speech. Our converter uses settings optimized for speech clarity.

Yes. Android has native AMR support built in. AMR was historically the default format for Android voice recordings and voicemail. Any Android phone can play AMR files without additional apps.

No. The conversion happens entirely in your browser using client-side processing. Your AVI file and the resulting AMR audio never leave your device, ensuring complete privacy for sensitive voice recordings.

Conversion is fast since AMR files are small and the audio extraction process is straightforward. A 10-minute AVI video typically converts in under 30 seconds, depending on your device's processing power.

Yes. Upload multiple AVI files and convert them all to AMR in a single batch. This is useful for archiving collections of recorded meetings, lectures, or interviews where storage efficiency matters.

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