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Convert VOB to AMR - Extract DVD Audio for Mobile

Pull audio from DVD files and compress to ultra-small AMR format for mobile devices.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Why Extract VOB Audio as AMR?

VOB files store DVD video content in the VIDEO_TS folder on any DVD disc. They contain MPEG-2 video along with multiple audio tracks, subtitles, and navigation data. When you only need the audio-for language learning, speeches, or lectures recorded on DVD-converting to AMR gives you the smallest possible file size.

AMR (Adaptive Multi-Rate) was designed specifically for voice content. It uses ACELP compression that excels at human speech while keeping files extremely small. In our testing, a 10-minute DVD audio clip converts to under 1 MB in AMR format, compared to 10+ MB for the same content in MP3.

How to Convert VOB to AMR

  1. Upload your VOB file - Drag and drop or browse to select your DVD video file
  2. Choose AMR as output - Select AMR from the audio format options
  3. Download your audio - Get your compressed, mobile-ready audio file

The entire process happens in your browser. No software installation required, and your files stay on your device during conversion.

VOB vs AMR: Technical Comparison

Understanding these formats helps you know what to expect from the conversion:

  • VOB audio - Usually AC3 (Dolby Digital), MP2, or PCM at 48 kHz. Surround sound capable with bitrates from 192-448 kbps per channel
  • AMR output - Mono speech audio at 8 kHz sampling rate. Variable bitrates from 4.75 to 12.2 kbps using narrowband codec

AMR sacrifices the high-fidelity audio from DVDs in favor of extreme compression. This tradeoff makes sense when your content is primarily dialogue, lectures, or spoken word where music quality is not the priority.

When VOB to AMR Makes Sense

Language Learning DVDs

Educational DVDs with language lessons translate well to AMR. You get the spoken content in a format that works on any phone without eating storage. Perfect for listening during commutes.

Lecture and Seminar Recordings

Academic or training DVDs often contain hours of spoken content. AMR compression means you can fit dozens of hours on a phone where storage is limited.

Audio Books on DVD

Older audiobooks came on DVD format. Converting to AMR lets you transfer them to modern mobile devices while maintaining clear voice reproduction.

Voice Memos from Video

If you need to extract and share just the dialogue from a VOB file, AMR creates the smallest sharable file while keeping speech intelligible.

When to Choose a Different Format

AMR is optimized for voice, not music. For DVD audio with music, soundtracks, or sound effects, consider these alternatives:

  • VOB to MP3 - Better balance of quality and size for mixed audio content
  • VOB to AAC - Higher quality compression for music, works on all Apple devices
  • VOB to FLAC - Lossless extraction when quality is paramount

Use AMR only when file size matters most and your content is speech-focused.

Device Compatibility

AMR was adopted as a standard by 3GPP for mobile networks. Compatibility is widespread:

  • Android phones - Native AMR support in all versions
  • Feature phones - AMR is the default voice memo format
  • VoIP applications - Many use AMR for voice transmission
  • Windows/Mac - Requires VLC or dedicated player

The converter works in any modern browser on any operating system. Upload from desktop or mobile-both work seamlessly.

Pro Tip

AMR uses variable bitrate encoding from 4.75 to 12.2 kbps. For clearer speech, the codec automatically shifts to higher bitrates during complex audio. For lectures with long pauses, AMR's discontinuous transmission feature creates even smaller files by encoding silence efficiently.

Common Mistake

Converting music or sound-rich DVDs to AMR expecting good quality. AMR is speech-only optimized-the 8 kHz sampling rate cuts off all frequencies above 3400 Hz, making music sound muffled and hollow. Use MP3 or AAC for music content.

Best For

Language learning DVDs, lecture recordings, audiobooks on DVD, and any spoken-word content where you need the smallest possible file size for mobile storage or sharing.

Not Recommended

Concert DVDs, movie soundtracks, karaoke discs, or any content where music quality matters. AMR will strip away the audio fidelity that makes music enjoyable. Choose a music-appropriate format instead.

Frequently Asked Questions

VOB (Video Object) is the container format used on DVDs. It stores MPEG-2 video along with audio tracks (usually AC3 or MP2), subtitles, and menu navigation. VOB files are found in the VIDEO_TS folder on any DVD disc.

AMR creates much smaller files than MP3-often 10x smaller for speech content. If you need to extract lectures, language lessons, or spoken content from DVDs and storage space matters, AMR is the most efficient choice. However, MP3 is better for music.

AMR is optimized for speech clarity, not music fidelity. Dialogue, lectures, and voice content sound clear and intelligible. Music and sound effects will sound compressed and lower quality compared to the original DVD audio.

Copy-protected DVDs use CSS encryption that prevents direct file access. Our converter works with unprotected VOB files that you can freely copy from a DVD. Protected commercial DVDs require separate ripping software first.

DVDs often contain multiple audio tracks (different languages, commentary). The converter extracts the primary audio track. If you need a specific language or commentary track, you may need to select it before uploading.

AMR files are extremely compact. Expect roughly 60-90 KB per minute of audio at standard quality settings. A full 2-hour DVD of spoken content converts to approximately 10-15 MB in AMR format.

iPhones do not natively support AMR playback. You would need a third-party app like VLC for iOS. For Apple devices, consider converting to M4A or AAC instead for native compatibility.

AMR-NB (Narrowband) samples at 8 kHz with 200-3400 Hz bandwidth-this is standard AMR. AMR-WB (Wideband) samples at 16 kHz with 50-7000 Hz bandwidth for better quality but larger files. Most AMR files use the narrowband variant.

Yes. The converter runs entirely in your browser and works on Android phones, iPhones, iPads, and tablets. Upload your VOB file from any device with a modern web browser.

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