VOB to M4A Converter

How to Convert VOB to M4A Online

1. Upload Your VOB Files: Drag and drop or click "+ Add Files" to load VOB files from a ripped DVD's VIDEO_TS folder. Batch upload is supported — drop all numbered files (VTS_01_1.VOB, VTS_01_2.VOB, etc.) and convert each in one pass. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.
2. Pick a Quality Preset: Default is Highest, which keeps M4A close to the original DVD audio. Drop to High or Medium for smaller files, or open Custom Bitrate and choose Constant Bitrate (predictable size — 128, 192, 256, 320 kbps are common AAC targets) or Variable Bitrate (better quality per MB; allocates more bits to complex passages). For Apple's iTunes-Store-grade quality, pick 256 kbps CBR.
3. Set Sample Rate, Channels, and Trim (Optional): Audio Sample Rate defaults to Unchanged — DVD audio is 48 kHz, and M4A handles 48 kHz natively, so leave it as-is unless you specifically need 44.1 kHz for CD compatibility. Switch Audio Channel from Stereo to Mono to halve voice-track size, or use Trim with start/duration markers (HH:MM:SS.mmm) to extract a specific song, scene, or commentary segment from a long VOB.
4. Convert and Download: Click "Convert" and download each M4A individually or grab them all as a ZIP. The audio stream is decoded from MPEG-2 program stream, re-encoded to AAC, and packaged in an MP4 container with the .m4a extension — ready for iTunes, Apple Music, iPhone, and any AAC-capable player.

Why Convert VOB to M4A?

VOB (Video Object) is the DVD-Video container defined in the DVD-Video Book by the DVD Forum. It carries MPEG-2 video, subtitles, and an audio stream that's almost always AC-3 (Dolby Digital) at 48 kHz — typically 192 kbps for stereo or 384/448 kbps for 5.1 surround. The DVD-Video spec explicitly does NOT allow AAC inside VOB, so playing a DVD soundtrack on modern Apple devices means extracting the audio and re-encoding it into M4A (AAC in an MP4 container) — the format iTunes, Apple Music, iCloud Music Library, and every iPhone since 2001 use natively. Typical scenarios:

• Rip concert and live-album DVDs to your music library — A 2-hour live concert DVD has a Dolby Digital 2.0 or 5.1 stream that's invisible to iTunes; converting to 256 kbps M4A (AAC-LC) gives you a transparent, iCloud-syncable copy at roughly 230 MB instead of the DVD's multi-GB footprint.
• Extract commentary tracks for podcast-style listening — Director commentaries on commercial DVDs are usually a second AC-3 stream; converted to 96 kbps mono M4A they become tidy 60 MB files that sync to AirPods and Apple Watch.
• Convert language-dub tracks for language learners — DVDs ship multiple audio streams (English, Spanish, French dubs); extracting each to M4A gives you per-language files for Anki, Apple Books audio, or shadowing apps.
• Archive personal home-video DVDs — Camcorder-burned DVDs from the early 2000s use MPEG-2 + AC-3; pulling the audio to M4A preserves the soundtrack for re-editing in GarageBand, Logic, or Final Cut Pro without the bulky video.
• Audiobook DVDs and lecture series — Older audiobook releases and university-course DVDs (Teaching Company, Modern Scholar) shipped as VOB; 64 kbps mono M4A cuts size by ~85% while staying intelligible on phone speakers.
• AirPlay, HomePod, and CarPlay playback — These Apple endpoints don't accept AC-3 over AirPlay 2 to non-Apple-TV speakers; M4A/AAC is universally accepted.

Have a different DVD audio target in mind? Use VOB to MP3 for maximum cross-platform compatibility, VOB to AAC for raw AAC without the MP4 wrapper, VOB to WAV for lossless editing, or VOB to FLAC to keep DVD audio quality without re-compressing. Keeping the video? Try VOB to MP4. Need to clean up the result? Trim M4A and Audio Cutter handle silence and chapter splits.

VOB Audio vs M4A — Format Comparison

AAC Bitrate Quick Guide for M4A

DVD AC-3 audio is already lossy, so going back to lossless makes no sense — the goal is matching or improving on the source's perceptual quality at smaller file size.

Frequently Asked Questions

Why is my VOB file split into multiple 1 GB chunks?

The DVD-Video spec caps each VOB file at 1 GB (1,073,741,824 bytes) for FAT-style filesystem compatibility on standalone players. A feature film is split into VTS_01_1.VOB, VTS_01_2.VOB, VTS_01_3.VOB, and so on — they're meant to be played as a continuous stream. Upload all numbered VOBs from the same title set; each will produce its own M4A. For one continuous audio track, concatenate the VOBs first (most DVD-rip tools do this automatically when exporting "Title 1") or merge the resulting M4A files in a DAW.

What audio codec is inside my VOB, and does it matter for M4A output?

Commercial DVDs almost always use AC-3 (Dolby Digital) at 48 kHz — 192 kbps for stereo, 384 or 448 kbps for 5.1. Some Region 2/3 DVDs and older PAL releases use MPEG-1 Layer 2 audio at 192–384 kbps. Music-focused DVDs occasionally ship Linear PCM at 1.5 Mbps. The converter decodes whichever codec is present and re-encodes to AAC for M4A, so the input codec doesn't affect your output settings — but it does affect ceiling quality: re-encoding 192 kbps AC-3 to 320 kbps AAC won't make it sound better than the AC-3 source.

Will I get the 5.1 surround channels from a Dolby Digital DVD?

If you select Stereo (the default), the 5.1 stream is downmixed to 2-channel using the DVD's metadata-defined coefficients (front L/R + 0.707 × center + 0.707 × surround L/R, the ATSC A/52 standard). To keep 5.1, leave the channel setting at Unchanged or Original — M4A/AAC supports up to 7.1 channels natively, and Apple Music and QuickTime play multichannel AAC fine. Most music ripping ends in stereo anyway since most playback (AirPods, car stereos, single HomePods) is 2-channel.

What's the difference between M4A and AAC files?

AAC is the audio codec; M4A is the container format. An .m4a file is an MP4 container holding an AAC (or sometimes ALAC) audio stream plus iTunes-style metadata (artwork, lyrics, chapter markers). A raw .aac file is the ADTS-framed AAC bitstream without a container — smaller header overhead but no metadata or seeking. M4A is what iTunes, Apple Music, the iOS Music app, and macOS expect; pick M4A for any Apple-ecosystem workflow.

Can I convert copy-protected commercial DVDs?

xconvert converts VOB files you upload, but commercial DVDs are encrypted with CSS (Content Scramble System) and most are also protected by region codes and Macrovision (RipGuard, ARccOS on some discs). You'll need to decrypt and copy the VOB files off the DVD first using a separate ripping tool (HandBrake with libdvdcss, MakeMKV, etc.) — laws vary by jurisdiction, so confirm fair-use, personal-archive, or library exceptions apply where you live. Once you have unencrypted VOB files, xconvert handles the audio extraction.

How do I keep chapter markers when converting a full-movie DVD?

VOB files themselves don't store chapter information — chapters live in the DVD's IFO files (VIDEO_TS.IFO, VTS_01_0.IFO). The audio conversion strips those markers since they're outside the VOB. If you need chapter markers in M4A (so playback apps can jump between scenes), use an audiobook-style workflow: extract the chapter timestamps from the IFO with a DVD tool, convert each VOB to M4A here, then use a tool like Subler or mp4chaps to inject chapter markers into the final M4A.

Will the M4A play on Android, Windows, and Linux too?

Yes. M4A/AAC is supported on Android (since 1.6), Windows Media Player 12+ (Windows 7 and later), VLC on any OS, foobar2000, MPV, and every modern browser via the HTML5 <audio> element. AAC-LC is also supported by every major streaming platform (Spotify upload, YouTube, SoundCloud). The "M4A is Apple-only" reputation is two decades out of date — it was true around 2003 but stopped being true by 2008.

My VOB has multiple audio tracks (commentary, dub, original) — can I pick which one?

The first audio stream in the VOB is converted by default. If your VOB has multiple PIDs (program IDs) — common for commentary, foreign-language dubs, or DTS alongside AC-3 — you'll need to demux the streams first with a DVD tool (PgcDemux, MKVToolNix, or ffmpeg -map 0:a:N) and upload each demuxed audio stream separately. Each resulting M4A will then carry exactly one of the source's audio tracks.

Is anything uploaded to your servers?

files are processed on our servers and deleted automatically after a few hours and deleted after the session ends. No account is required, no watermark is added to the M4A, and there are no file-count limits or hidden Pro tiers gating the converter.