Free online VOB to M1V converter

What the VOB format is

VOB, or Video Object, is the container used by DVD-Video discs. It commonly holds MPEG-2 video, one or more audio tracks, subtitles, menu-related data, and navigation information in an MPEG program stream structure. DVD authoring applications, DVD recorders, and DVD-ripping tools create or extract VOB files; you usually encounter them in a disc's VIDEO_TS folder.

A title is often split across several files such as VTS_01_1.VOB, VTS_01_2.VOB, and VTS_01_3.VOB. A single VOB may also contain multiple video, audio, or subtitle streams.

What the M1V format is

M1V is an MPEG-1 video elementary stream. It contains video only, without an audio track or the menus, subtitles, chapters, and metadata found in a DVD VOB. MPEG-1 video is supported by many older editing, presentation, authoring, and hardware playback systems, and its elementary-stream structure is useful when another application expects separate video and audio files.

M1V generally requires less storage and decoding power than DVD-quality MPEG-2, but conversion can reduce resolution, detail, and motion quality. Use M1V when the receiving application specifically requires MPEG-1 video; use an MPEG program or transport stream instead if audio must remain in the same file.

How to convert VOB to M1V

Using FFmpeg

FFmpeg is suitable for selecting the video stream and encoding it as MPEG-1. Open a terminal in the folder containing the source file and run:

ffmpeg -i input.vob -map 0:v:0 -c:v mpeg1video -q:v 2 -an -f mpeg1video output.m1v

-map 0:v:0 selects the first video stream, -c:v mpeg1video performs the required MPEG-1 video encode, -q:v 2 requests high quality using FFmpeg's quantizer scale, -an omits audio, and -f mpeg1video writes an elementary MPEG-1 video stream rather than a VOB-like program stream.

For a DVD-sized source, an explicit compatible frame size can help older equipment:

ffmpeg -i input.vob -map 0:v:0 -vf scale=720:480 -c:v mpeg1video -b:v 2500k -an -f mpeg1video output.m1v

Use scale=720:576 for PAL material. Preserve the source's aspect ratio when possible; forcing a different shape can stretch faces and objects. If the DVD title spans multiple VOB files, open the corresponding title through a DVD-aware application or create a concatenated input rather than converting an arbitrary segment.

Using the online converter

You can convert the file for free on 101convert.com without installing software. Upload the VOB, choose M1V as the output format, start the conversion, and download the resulting file. The service can only process a VOB that is accessible as an ordinary file; encrypted commercial DVDs must first be handled with legally permitted DVD software.

Quality, compatibility, and limitations

M1V cannot retain VOB audio, subtitles, chapters, menus, copy-protection data, or DVD navigation. Keep the original VOB files if those features matter. If a separate audio file is required, extract and convert the selected audio stream independently, then import both files into the target application.

DVD VOB video is usually interlaced MPEG-2. MPEG-1 output can retain interlacing, but some playback software expects progressive video; deinterlace only when the target device requires it, because deinterlacing changes motion detail. Commercial DVDs may be CSS-encrypted, and FFmpeg cannot normally read encrypted VOB data directly; use an authorized, decrypted source first.