MPEG to VOB Converter
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Need help?MPEG to VOB Converter
VOB is DVD-Video's own container, and its relationship to a plain .mpeg file is a one-way one: every VOB is an MPEG program stream, but not every MPEG program stream qualifies as a VOB. The DVD specification narrows the general format down to particular codecs, particular frame sizes, particular audio formats and a hard bitrate ceiling. This conversion is that narrowing — it re-encodes an .mpeg or .mpg into a DVD-shaped stream and hands you a single .vob file. What it deliberately does not do is build a disc, because a disc needs navigation files that only authoring software writes.
DVD-Video at a Glance
| Property | Value |
|---|---|
| Container | VOB, a constrained subset of the MPEG program stream |
| Video codecs permitted | H.262 / MPEG-2 Part 2 up to 9.8 Mbit/s, or MPEG-1 Part 2 up to 1.856 Mbit/s |
| Combined bitrate ceiling | 10.08 Mbit/s split across video, audio and subpicture |
| NTSC frame sizes (29.97 fps) | 720 x 480, 704 x 480, 352 x 480, 352 x 240 |
| PAL frame sizes (25 fps) | 720 x 576, 704 x 576, 352 x 576, 352 x 288 |
| Audio formats permitted | Dolby Digital (AC-3), DTS, PCM, MPEG-1 Audio Layer II (MP2) |
| Also multiplexed inside a VOB on disc | Subtitles, DVD menus and navigation content |
| File splitting on disc | A title is broken into 1 GiB VOB parts for filesystem compatibility |
| Navigation files a player needs | VIDEO_TS.IFO and .BUP, plus VTS_zz_0.IFO and .BUP beside the VOBs |
| What this converter writes | One .vob containing re-encoded video and audio — no menus, no navigation |
How to Convert MPEG to VOB
- Upload Your MPEG File: Drag and drop your
.mpegor.mpgonto the page, or click "Add Files" to browse. Queue every clip destined for one disc together if you like — each converts separately. - Confirm the Video Codec and Audio Codec: MPEG-2 is preselected, which is what DVD-Video expects; MPEG-1 is the only alternative. Audio is preselected on MP2, with AC3 (Dolby Digital), DTS (DCA) and MP3 also listed — but see the audio question below before choosing MP3.
- Set Video resolution, and Trim if needed: Video resolution starts on "Keep original" and also takes Resolution Percentage, Preset Resolutions, Width, Height, or Width x Height. On this codec resolution is the control that genuinely moves the output, for the reason set out in the next section. Trim takes a Start time and Duration.
- Convert and Download: Click Convert and download the
.vob. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark, never shared or made public.
What the File Compression Controls Actually Do on MPEG-2
MPEG-2 has no constant-quality mode. Our encoder logs exactly that when a quality-style setting reaches it — "MPEG-2 does not support CRF/quality mode" — and substitutes a bitrate calculated from the output resolution. The practical consequence is that the two quality modes are inert here and the bitrate modes are floored.
| File Compression mode | What you type | What the encoder actually does |
|---|---|---|
| Quality Preset (preselected, "Very High") | A preset name | Scales the source bitrate by a preset multiplier, then raises the result to the resolution minimum if it falls below |
| Specific file size | A target size | Derives a bitrate from it, then applies the same floor |
| Constant Bitrate | One bitrate | Uses it, unless it is under the floor |
| Variable Bitrate | Target, minimum and maximum | Uses them, floored at the resolution minimum, with -minrate dropped to avoid buffer errors |
| Constant Quality | A number from 1 to 31 | Discards the number entirely and encodes at the resolution minimum |
| Constraint Quality | A number plus a maximum bitrate | Same — the quality number is discarded and the resolution minimum is used |
That floor is derived from the output frame size, on the basis that MPEG-2 fails outright if asked to encode a large picture at a small bitrate.
| Output frame size | Approximate minimum bitrate our encoder will use |
|---|---|
| 352 x 240 or 352 x 288 | 2 Mbit/s — the absolute floor |
| 720 x 480 or 720 x 576 (DVD) | 2 Mbit/s — the floor again |
| 1280 x 720 | About 2.8 Mbit/s |
| 1920 x 1080 | About 7.5 Mbit/s |
So the honest instruction is: choose the frame size you want, keep the Quality Preset where it is, and do not spend time on Constant Quality expecting it to change anything.
Hitting DVD Frame Sizes
One trap is worth spelling out. Preset Resolutions set the height only and let the width follow the source's aspect ratio, so choosing "480p" gives you a 480-pixel-tall frame at whatever width the source implies — not the 720 x 480 that DVD-Video specifies. To land on a legal DVD frame size, use Width x Height and enter the pair directly: 720 x 480 for NTSC, 720 x 576 for PAL.
The second consideration is anamorphic material. Any resize normalises the pixel aspect ratio to square, so a 16:9 DVD source that stored its widescreen picture in a 720 x 480 grid loses that instruction. If your authoring software offers a display-aspect setting, set it there; otherwise leave Video resolution on "Keep original" so the stored geometry passes through untouched.
A Single VOB Is Not a DVD
A .vob holds the multiplexed streams, but a set-top player also needs the navigation layer — the VIDEO_TS folder with its .IFO information files and .BUP backups — before it can find a title, let alone a menu. Media players will often open a lone unencrypted VOB directly, but DVD navigation simply is not available when the IFO and BUP files are missing. To get from this file to a disc, load the VOB into DVD authoring software: DVDStyler is a free, GPL-licensed option for Windows and Linux that builds menus and burns the result. If what you actually want is a file for phones, TVs or the web rather than a disc, skip VOB and use MPEG to MP4.
Frequently Asked Questions
My source is already an MPEG program stream. Isn't that already a VOB?
Not quite, and the asymmetry matters. Every VOB is an MPEG program stream, but the reverse does not hold: DVD-Video constrains which codecs, frame sizes, frame rates, audio formats and bitrates are allowed inside. A generic .mpeg from a capture card or a download may sit outside those limits in any of those dimensions, which is why this conversion re-encodes rather than simply renaming the file. If your source already happens to be DVD-compliant, the re-encode is mostly a formality — but it is still a re-encode, so keep the quality generous.
Is a .vob file on its own a playable DVD?
No. It carries the video and audio, but a DVD player looks for the VIDEO_TS directory and its .IFO and .BUP navigation files to work out what titles exist and how to play them. Without those, a set-top player has nothing to navigate; desktop players will usually decode the stream directly but cannot offer chapters or menus. Authoring software is what turns this file into a disc structure.
Why doesn't the quality setting change the size of my VOB?
Because MPEG-2 has no constant-quality mode to drive. When a quality-style setting reaches the encoder, our pipeline logs "MPEG-2 does not support CRF/quality mode" and substitutes a bitrate derived from the output resolution — so the number you typed into Constant Quality or Constraint Quality is discarded before it ever reaches the encoder. Quality Preset and the bitrate modes do influence the target, but they are all raised to the same resolution-derived floor if they fall beneath it. Change Video resolution if you want the output to move.
Which resolution should I pick for an NTSC or a PAL disc?
Enter it as Width x Height rather than using a preset: 720 x 480 for NTSC, 720 x 576 for PAL. The Preset Resolutions list sets height alone and derives width from the source aspect ratio, so "480p" on a widescreen capture will not give you 720 x 480. DVD-Video also permits 704 x 480, 352 x 480 and 352 x 240 on NTSC, and 704 x 576, 352 x 576 and 352 x 288 on PAL, if you are deliberately trading resolution for runtime.
Why is MP2 the default audio, and can I use MP3 instead?
MP2 — MPEG-1 Audio Layer II — is preselected because it is one of the four audio formats DVD-Video permits, alongside Dolby Digital (AC-3), DTS and linear PCM, and it plays on every DVD player ever built. MP3 appears in the dropdown but is not a legal DVD-Video audio format; a file built with it may be rejected by authoring software or play silently on a set-top player. Stay on MP2 for straightforward stereo, or choose AC3 if you want Dolby Digital surround matching what commercial discs ship with.
MPEG-1 or MPEG-2 — does the choice matter?
Both are legal, but they sit at very different points. DVD-Video allows MPEG-2 up to 9.8 Mbit/s and MPEG-1 only up to 1.856 Mbit/s, so MPEG-1 is the VCD-era option: much lower quality, much smaller files, and no reason to choose it unless you are deliberately reproducing a period-correct low-bitrate title. MPEG-2 is preselected and is what essentially every commercial DVD uses.
What bitrate keeps me inside the DVD-Video ceiling?
Video peaks at 9.8 Mbit/s and the combined video, audio and subpicture stream must stay under 10.08 Mbit/s, so a video bitrate of 8 Mbit/s or below leaves comfortable room for the soundtrack. Working the other way, runtime sets the budget: a single-layer disc holds about 4.7 GB, so a long recording needs a lower average bitrate to fit. Set that under Constant Bitrate or Variable Bitrate — those are the modes the encoder actually honours.
My capture is interlaced. Will that cause problems on a DVD?
No, and that is one place where interlacing is welcome. DVD-Video was designed around interlaced standard-definition television, so an interlaced MPEG-2 source is exactly what a set-top player and a CRT expect. Do note that nothing in this pipeline deinterlaces, so if you were hoping to produce a progressive master from an interlaced capture, that has to happen in a desktop encoder before you upload.
Can I turn the VOB back into an ordinary video file afterwards?
Yes. VOB to MP4 re-encodes a DVD stream into H.264 for phones, browsers and smart TVs, and VOB to MPEG takes it back to a generic program stream if that is what a tool wants. Trimming is easier before conversion than after — the Video Cutter lets you pick in and out points on the source.
How are my files handled during the conversion?
Files travel over an encrypted connection, are converted on our servers, and both the upload and the finished .vob are deleted automatically after a few hours. Because the encoding happens server-side, the practical constraint is upload size and connection speed rather than anything on your own machine. There is no sign-up, no watermark, and files are never shared or made public.