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O převodu VOB na AMR

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.

Proč převádět VOB na AMR?

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.

Běžné případy použití

Extracting DVD lecture dialogue for delivery via legacy voicemail systems
Creating ultra-compact audio clips from DVD content for MMS distribution
Pulling speech from DVD recordings for automated telephony (IVR) systems
Extracting DVD audio for speech-to-text transcription engines that accept AMR input
Creating minimal-size audio summaries from DVD presentations for 2G network delivery

Jak to funguje

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.

Kvalita a výkon

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.

FFMPEG EngineModerateMinimal Quality Loss

Kompatibilita zařízení

Device	VOB	AMR
Windows PC	Partial	Partial
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No

Doporučená nastavení podle platformy

YouTube

Resolution: 1920x1080

Bitrate: 8-12 Mbps

H.264 recommended for fast processing

Instagram

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

Tipy pro nejlepší výsledky

1Only use AMR for voice/speech content — it is completely unsuitable for music or sound effects from DVDs
2Emphasize the center channel when downmixing 5.1 to mono for the clearest dialogue
3Use 12.2 kbps mode for the best speech quality AMR supports
4Consider AMR-WB if the target system accepts it — wideband is significantly clearer
5Pre-filter with noise reduction to improve speech clarity before the aggressive AMR compression

Související převody

VOB to MP4 Converter VOB to AAC Converter VOB to AVI Converter VOB to FLAC Converter VOB to WAV Converter MP4 to AMR Converter AAC to AMR Converter AVI to AMR Converter FLAC to AMR Converter WAV to AMR Converter AMR to MP4 Converter

VOB to AMR is an extreme compression conversion suitable only for speech extraction from DVDs when minimum file size is the overriding priority.

Často kladené otázky

No. AMR is mono-only. The 5.1 mix is collapsed to a single channel, emphasizing the center (dialogue) channel.

Dramatically smaller. DVD AC3 at 448 kbps is about 3.3 MB/min; AMR at 12.2 kbps is about 90 KB/min — roughly 37x smaller.

Yes. AMR-WB at 16 kHz with up to 23.85 kbps is noticeably clearer for speech. Use the wideband variant when supported.

No. AMR destroys music content due to its 300-3400 Hz frequency limitation and aggressive compression. Use AAC or MP3 for music.

Select the track with the best dialogue clarity — usually the main language track in AC3 stereo if available, or the center channel from 5.1.

Související převody a nástroje

Převeďte VOB také na

VOB to MP4→VOB to AAC→VOB to AVI→VOB to FLAC→VOB to WAV→VOB to WebM→

Převeďte také na AMR

MP4 to AMR→AAC to AMR→AVI to AMR→

Vlastnost	VOB	AMR
Celý název	DVD Video Object	Adaptive Multi-Rate Audio
Přípona	.vob	.amr
Nejlepší pro	DVD format	Speech optimized

Convert VOB to AMR — Free Online Converter