Convert DVD Video Object (.vob) 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
Upload your .vob 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.
DVD VOB files contain high-quality audio (AC3, DTS, or LPCM) designed for home theater systems. AMR (Adaptive Multi-Rate) is a narrowband speech codec operating at 4.75-12.2 kbps, mono, 8 kHz — designed for GSM cellular voice. The quality gap between DVD audio and AMR is enormous, making this conversion appropriate only for speech content.
AMR produces the smallest possible audio files — about 90 KB per minute. This extreme compression is useful only for extracting speech-only content (dialogue, commentary, lectures) from DVDs when the audio needs to be delivered via MMS, legacy voicemail, or IVR systems with strict format requirements.
The conversion reduces DVD audio quality to telephone-grade, which is acceptable for speech recognition and transcription pipelines that do not require high fidelity.
FFmpeg reads the VOB program stream, decodes AC3/DTS/LPCM audio, downmixes to mono, resamples to 8 kHz, and encodes to AMR-NB using libopencore-amrnb. The 5.1 surround mix from DVD is collapsed to mono with center channel emphasis for dialogue clarity. The output uses the standard AMR file format.
Quality is dramatically reduced from DVD-grade to telephone-grade. The 8 kHz sample rate and narrowband filtering remove all frequencies outside 300-3400 Hz. Music and sound effects from the DVD are practically destroyed, while speech remains intelligible.
| Device | VOB | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
VOB to AMR is an extreme compression conversion suitable only for speech extraction from DVDs when minimum file size is the overriding priority.
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| No |
| الميزة | VOB | AMR |
|---|---|---|
| الاسم الكامل | DVD Video Object | Adaptive Multi-Rate Audio |
| الامتداد | .vob | .amr |
| الأفضل لـ | DVD format | Speech optimized |