ASF to VOB Converter

ASF to VOB Converter

ASF (Advanced Systems Format) is Microsoft's container for Windows Media video and audio — usually WMV video with WMA sound. VOB (Video Object) is the container that lives inside a DVD's VIDEO_TS folder: an MPEG-2 program stream with AC-3, LPCM, or MPEG audio. Converting ASF to VOB re-encodes a Windows Media file into the codec and container a DVD-authoring program expects. One honest caveat up front: a single .vob file is not a playable DVD on its own — see the FAQ below for why and what to do with the output.

ASF Format at a Glance

VOB Format at a Glance

How to Convert ASF to VOB

1. Upload Your ASF File: Drag and drop your .asf or .wmv file, or click "+ Add Files." You can queue several files and apply the same settings to all of them.
2. Set the Quality Preset: Open Advanced Options and choose a Quality Preset — "Very High (Recommended)" is the default. The converter targets the MPEG-2 video and DVD-legal audio that VOB requires.
3. Set Video Resolution (Optional): Use the Video resolution controls to match a DVD-legal size — 720×480 for NTSC or 720×576 for PAL — via Preset Resolutions or Width × Height. You can also Trim to a Time Range to keep the file under the DVD bitrate budget.
4. Convert and Download: Click "Convert" and download your VOB file. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. No sign-up, no watermark.

Frequently Asked Questions

Will the .vob file play as a DVD on its own?

No. A standalone .vob holds the multiplexed MPEG-2 video and audio, but a real DVD also needs the IFO (information) and BUP (backup) files that sit alongside it in a VIDEO_TS folder. Those files carry the menu, chapter, and navigation data a DVD player reads first. Most software players will still play a lone .vob as a regular video, but a DVD player or set-top box expects the full VIDEO_TS structure, which you create with a DVD-authoring program after this conversion.

Will I lose quality converting ASF to VOB?

Some, yes. WMV (the usual ASF video codec) and VOB's MPEG-2 are both lossy, so this is a lossy-to-lossy re-encode — you cannot recover detail that ASF compression already discarded, and MPEG-2 is older and less efficient than modern codecs. In our testing, keeping the "Very High" Quality Preset and a DVD-legal resolution (720×480 or 720×576) holds the visible quality close to the source while staying inside DVD-Video's 9.8 Mbit/s video ceiling.

Why convert to VOB instead of MP4?

Only convert to VOB if a DVD-authoring workflow specifically needs MPEG-2 in a DVD container. For playback on phones, smart TVs, browsers, and editors, MP4 (H.264) is smaller, sharper at the same size, and far more widely supported — try ASF to MP4 instead. VOB exists to bridge into the DVD-Video format, not to modernize a file.

What audio does the VOB output use?

VOB only allows the audio types the DVD-Video spec permits: LPCM, AC-3 (Dolby Digital), DTS, or MPEG-1 Audio Layer II. The WMA track inside your ASF is re-encoded to a DVD-legal format — AAC is explicitly disallowed in VOB, so it is never used here.

Is the conversion accurate to the DVD spec's resolution limits?

DVD-Video only accepts a fixed set of frame sizes: 720×480, 704×480, 352×480, or 352×240 for NTSC, and 720×576, 704×576, 352×576, or 352×288 for PAL. If your ASF is, say, 1280×720, choose a DVD-legal preset in the Video resolution controls before converting so a DVD-authoring tool will accept the file without re-scaling it again.

Can I go the other way, from VOB back to a modern format?

Yes. If you have ripped VOB files from a DVD and want something portable, VOB to MP4 re-encodes the MPEG-2 stream to H.264 in an MP4 container for normal playback and editing.

Are my files kept private?

Yes. Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.