3G2 to VOB Converter

Putting Old Phone Video on a DVD: What This Tutorial Covers

3G2 is the 3GPP2 file format — the container CDMA handsets on Verizon, Sprint and US Cellular wrote when phone video meant a 176x144 clip with a speech-codec soundtrack. VOB is DVD-Video's container, sized around a 720x480 television picture. Going from one to the other means a very small source landing in a format designed for something roughly fifteen times the pixel count.

That gap is the whole story of this conversion, and getting a watchable disc out of it is mostly about not stretching the picture as far as the format allows. This tutorial covers the frame size to choose, what happens to the mono AMR soundtrack, and the step this page cannot do for you — building the disc itself.

How to Convert 3G2 to VOB

1. Upload Your 3G2 File: Drag the file onto the page or click "+ Add Files" to browse. This page accepts both .3g2 and .3gp, so a mixed folder of old handset clips works. Queue every clip destined for one disc together — each is converted separately and you assemble them at the authoring stage.
2. Confirm the Video Codec and Audio Codec: MPEG-2 is what the Video Codec list opens on and what DVD-Video expects; MPEG-1 is the only alternative. Audio Codec opens on MP2, with AC3 (Dolby Digital), DTS (DCA) and MP3 also listed — read the audio question below before picking MP3.
3. Set Video resolution Deliberately: This is the step that decides whether the result looks acceptable. Video resolution opens on "Keep original" and also takes Resolution Percentage, Preset Resolutions, Width, Height and Width x Height — use the last of these and type a DVD-legal pair. The walk-through below says which one. Trim takes a Start time and a Duration.
4. Convert and Download: Click Convert and download the .vob. Files upload over an encrypted connection, are converted on our servers and are deleted automatically after a few hours — no sign-up, no watermark, never shared or made public.

Walk-through: Which Frame Size to Type

DVD-Video does not only allow the full 720x480 or 720x576 picture. It also permits a set of smaller rasters, and for a handset source those are frequently the better choice — they leave the picture nearer its native size, so upscaling artefacts are less visible, and they keep the file smaller.

Two traps to avoid. Preset Resolutions sets the height only and lets the width follow the source aspect, so choosing "480p" on a 176x144 clip gives you a 586x480-ish frame that DVD-Video does not permit and your authoring tool will refuse. And do not reach for a preset above standard definition at all: a 176x144 clip stretched to 1080p is more than eighty times its original pixel count, produces a soft mess, and raises the encoder's bitrate floor from 2 Mbit/s to about 7.5 Mbit/s for no gain whatsoever.

The audio deserves a moment too. Most .3g2 files carry AMR Narrow Band — an 8 kHz mono speech codec designed for cellular voice, not for recording. It is re-encoded into MP2 on the way through, and it stays mono at whatever fidelity the phone captured. On laptop speakers that passed unnoticed; through a television it will not. There is nothing on this page that improves it, because the information was never recorded.

What Each File Compression Mode Actually Does

MPEG-2 has no constant-quality mode, so our encoder substitutes a bitrate derived from the output frame size whenever a quality-style setting reaches it. On a source this small, that substituted figure is almost always what you get.

The floor is 2 Mbit/s for anything up to standard definition, rising to roughly 2.8 Mbit/s at 1280x720 and 7.5 Mbit/s at 1920x1080. A 30-second phone clip that was 400 KB as a .3g2 therefore comes back as roughly 8 MB of VOB. That is not a fault; it is MPEG-2 refusing to encode below a rate it can service.

Common Errors and How to Fix Them

• "The authoring tool rejected the resolution" — you used a height preset rather than Width x Height. Presets set the height only and derive the width from the source aspect, which almost never lands on a legal DVD raster. Type the pair explicitly.
• "The picture is a blurry mess" — the frame was stretched too far. A QCIF or QVGA clip belongs at 352x240 or 352x288, not 720x480, and certainly not at an HD preset.
• "The whole thing is stretched sideways" — old handsets recorded 4:3 and 11:9 pictures. Sending a 176x144 (11:9) clip to a 4:3 raster changes its shape slightly; sending it to a widescreen raster changes it a lot. Match the shape or accept a small crop in your authoring tool.
• "The audio sounds like a phone call" — because it was one. AMR Narrow Band is 8 kHz mono speech coding; the MP2 re-encode preserves what is there and cannot add what is not.
• "The sound is mono on a stereo system" — expected. Both AMR modes are mono by specification, so there is no second channel to recover.
• "My files are .3gp, not .3g2" — both are accepted on this page, so upload them as they are.
• "The DVD player will not read the file" — a lone .vob is not a disc. See the next section.

A VOB Is Not a Disc

The file you download holds the multiplexed video and audio, 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 or show a menu. Desktop media players will usually open a lone unencrypted VOB directly; DVD navigation is simply unavailable without those files.

That step belongs to DVD authoring software, which takes VOB or MPEG-2 input, builds the folder structure, adds chapters and menus, and burns or writes an ISO. This page produces the input to that process. And if you are only making the disc because it is a convenient way to hand someone a collection of old phone clips, consider whether a file is easier: 3G2 to MP4 produces something that plays on every phone, laptop and smart TV without a disc drive, which fewer and fewer machines still have.

Frequently Asked Questions

What resolution should I actually type for my old phone clips?

For 176x144 (QCIF) and 320x240 (QVGA) sources, type 352x240 for an NTSC disc or 352x288 for a PAL one — both are legal DVD-Video frame sizes and both keep the scale factor small enough that the picture still looks like itself. Reserve the full 720x480 or 720x576 D1 frame for 640x480 sources, or for the case where you are mixing clips onto one disc and want them all at the same size. Always enter it under Width x Height; the Preset Resolutions list sets height only and will not land on a legal raster.

Why is the VOB so much larger than my 3G2 file?

Because MPEG-2 has a minimum bitrate below which it fails to encode, and our pipeline enforces it. That floor is 2 Mbit/s for standard-definition frame sizes, applied whatever the source was. A 3G2 clip recorded at a couple of hundred kilobits per second therefore comes back roughly ten times larger, and larger still if you also upscale the frame. Keeping the resolution modest is the only meaningful lever — the quality controls cannot take the output below the floor.

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 every DVD player ever built decodes it. MP3 appears in the dropdown and will mux into the program stream without an error, but it is not a legal DVD-Video audio format, so an authoring tool may refuse the file or a set-top player may run it silently. Stay on MP2 unless you have a reason to pick AC3.

Will my AMR audio track sound better after conversion?

No. AMR Narrow Band samples at 8 kHz in mono, which is telephony bandwidth — it was chosen so a handset could record video and still fit the result into a picture message. Re-encoding it as MP2 stores those samples faithfully in a DVD-legal format, but no encoder can reconstruct frequencies the microphone path never captured. If a clip matters enough, the practical fix is to replace the audio entirely in an editor before you author the disc.

Can I put several phone clips on one disc?

Yes, but this page is only the first half of that job. Upload the clips together and each one is converted into its own .vob with the same settings, which is exactly what you want — an authoring tool then imports them as separate titles or chapters and builds the VIDEO_TS structure around them. Convert everything at the same frame size so the tool does not have to reconcile mixed rasters, and use Trim to drop dead air at the start and end of each clip before the encode rather than after.

Should I choose MPEG-1 or MPEG-2?

MPEG-2, which is preselected. Both are legal on a DVD, but they sit at very different points: DVD-Video allows MPEG-2 up to 9.8 Mbit/s while MPEG-1 is capped at 1.856 Mbit/s and was the Video CD-era option. On a small phone source the quality difference is less dramatic than it would be on a film, but MPEG-2 is what every disc and every authoring tool assumes, and there is no compatibility benefit to choosing the older one.

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, and it is a separate step from the conversion.

Does the converter deinterlace anything?

There is nothing to deinterlace — handset video is progressive, and there is no deinterlacing filter in this pipeline in any case. Worth knowing in the other direction, though: DVD-Video was designed around interlaced standard-definition television, so a progressive source is perfectly legal on a disc and a player will handle it. If you later convert a broadcast recording through the same page, its interlacing will be preserved as-is.

What if I would rather have a file than a disc?

Then convert to 3G2 to MP4 instead. MP4 with H.264 is dramatically more efficient than MPEG-2 — the same clip lands at a fraction of the VOB's size — it has no bitrate floor forcing the file upward, and it plays on phones, browsers, smart TVs and every editor without an authoring step or an optical drive. VOB is the right answer only when a physical disc is genuinely the deliverable.

How are my files handled during the conversion?

Files travel over an encrypted connection, are converted on our servers, and both the uploads and the finished .vob files are deleted automatically after a few hours. There is no sign-up, no watermark, and nothing is shared or made public. Because the encoding happens on our side, the practical constraint is upload size and connection speed rather than your own machine — and handset clips are tiny, so even a large batch uploads quickly.