Video Format Comparison

VOB vs MKV: DVD Video Format vs Universal Media Container

VOB (Video Object) is the container format used on DVD discs — it contains MPEG-2 video, AC-3 (Dolby Digital) or DTS audio, and DVD menus. MKV is the modern open container that supports virtually every codec. For archiving DVD content digitally, MKV is the standard: smaller files, better codec support, and no DVD-specific limitations.

VOBvsMKV

Quick Verdict

Use VOB when…

Keep VOB files if you want to preserve the original DVD structure (menus, chapter markers in VOB format, subtitle streams). Useful for DVD authoring and when original disc playback fidelity is required.

Use MKV when…

Convert to MKV for digital archives, media servers (Plex, Jellyfin, Kodi), and modern media players. MKV allows transcoding to H.264/H.265, preserves all subtitle and audio tracks, and is smaller than VOB at equivalent quality.

VOB vs MKV: Feature Comparison

Feature	VOB	MKV
Video codec	MPEG-2 (DVD standard)	H.264, H.265, AV1, or any codec
File size	Large (MPEG-2 is inefficient)	Smaller (H.264/H.265)
DVD menus	Preserved (DVD structure)	Not supported
Subtitle tracks	VOBsub image-based	SRT, ASS, VOBsub — all supported
Media server support	Requires transcoding (Plex)	Native direct play
Modern device playback	Requires MPEG-2 decoder	Universal
Lossless remux option	N/A (is the source)	Yes — MPEG-2 MKV with no re-encoding

When VOB wins

✓Video codec: MPEG-2 (DVD standard)
✓File size: Large (MPEG-2 is inefficient)
✓DVD menus: Preserved (DVD structure)

When MKV wins

✓Video codec: H.264, H.265, AV1, or any codec
✓File size: Smaller (H.264/H.265)
✓DVD menus: Not supported

Frequently asked questions

Can I convert VOB to MKV without re-encoding?

Yes — lossless remux: `ffmpeg -i input.vob -c copy output.mkv`. This wraps the MPEG-2 video and AC-3 audio in an MKV container without any quality loss. The resulting MKV is the same quality as the DVD. File size is similar (MPEG-2 is the same codec either way). Re-encode to H.264 for smaller files: `ffmpeg -i input.vob -c:v libx264 -crf 18 -c:a aac output.mkv`.

How do I convert an entire DVD to MKV?

Use MakeMKV (free for personal use): insert the DVD → open MakeMKV → it reads the disc and presents all titles → select the main movie and desired audio/subtitle tracks → click 'Make MKV'. MakeMKV does a lossless remux — no quality loss. For subtitle extraction: MakeMKV includes all subtitle tracks automatically. HandBrake can re-encode for smaller files.

Do DVD subtitles work in MKV?

Yes. DVD uses VOBsub subtitles (image-based, stored as pixel images). MKV can embed VOBsub subtitle tracks. For text-based subtitles: rip with subtitleripper or VobSub2SRT to convert image subs to SRT, then embed in MKV. Text SRT subtitles in MKV are searchable, smaller, and work better with media players than image VOBsub.