Convert MP4 to VOB — Free Online Tool
Convert MP4 files to VOB format for DVD-Video compatibility, re-encoding your H.264/H.265 video to MPEG-2 and your audio to AC3 (Dolby Digital) — the two codecs native to the DVD standard. This is essential when you need to author or play back content on hardware DVD players and set-top boxes that cannot read modern compressed formats.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
Unlike a simple remux, converting MP4 to VOB requires full transcoding of both the video and audio streams. MP4 files typically contain H.264 (libx264) or H.265 (libx265) video, neither of which is part of the DVD-Video specification. This tool re-encodes the video stream to MPEG-2, the compression standard mandated by DVD-Video, and converts the audio — whether AAC, MP3, or Opus — to AC3 (Dolby Digital), the primary audio format for DVD. The output is wrapped in a VOB container with the '-f vob' flag, producing a file structured around the MPEG program stream format that DVD hardware and authoring software expect. Because both video and audio must be decoded and re-encoded, this conversion is computationally intensive and will take longer than a simple format remux.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg application, the open-source multimedia processing engine that performs all decoding, re-encoding, and container muxing for this conversion. |
-i input.mp4
|
Specifies the input file — an MP4 container that typically holds H.264 or H.265 video and AAC audio, neither of which is compatible with the DVD-Video standard used by VOB files. |
-c:v mpeg2video
|
Re-encodes the video stream to MPEG-2, the video codec mandated by the DVD-Video specification and the only video format natively supported by hardware DVD players. |
-c:a ac3
|
Re-encodes the audio stream to AC3 (Dolby Digital), the primary audio format defined by the DVD-Video standard, replacing the AAC or other audio codec used in the source MP4. |
-q:v 4
|
Sets the MPEG-2 video quality using a variable quantizer scale, where 1 is highest quality and 31 is lowest. A value of 4 produces good visual quality suitable for DVD authoring while keeping file sizes manageable. |
-b:a 192k
|
Sets the AC3 audio bitrate to 192 kilobits per second, a standard DVD audio bitrate that provides good stereo audio quality and broad compatibility with DVD players and authoring tools. |
-f vob
|
Forces the output container format to VOB (MPEG program stream), ensuring the file is structured correctly for DVD authoring software and hardware playback regardless of the output file extension. |
output.vob
|
The name of the output file. The .vob extension identifies this as a Video Object file, the container format used within the DVD-Video disc structure to store multiplexed MPEG-2 video and AC3 audio. |
Common Use Cases
- Burning home movies stored as MP4 files onto DVD discs for playback on a living room DVD player using authoring software like DVD Styler or Nero
- Preparing video content for a DVD authoring pipeline where the software requires pre-encoded MPEG-2/AC3 VOB assets rather than MP4 source files
- Archiving digital video in the DVD-Video format for long-term physical media storage on a format that remains broadly readable by legacy hardware
- Converting MP4 recordings of events, presentations, or performances into VOB files to distribute on DVD to audiences who may not have modern streaming devices
- Creating VOB files from MP4 source footage to test DVD menu and chapter structure in authoring tools before committing to a full disc burn
- Re-encoding a modern MP4 download to MPEG-2/AC3 VOB so it can be played back on an older DVD-based media system in a vehicle or hospitality setting
Frequently Asked Questions
Yes, some quality loss is expected because MPEG-2 is a significantly older and less efficient codec than H.264 or H.265. At the same bitrate, MPEG-2 produces more compression artifacts, particularly in fast-motion scenes and fine detail. However, at the default quality setting (-q:v 4), the output is generally good enough for standard-definition DVD playback on a television. If quality is critical, lower the -q:v value toward 1 for better results at the cost of a larger file.
The DVD-Video specification requires audio to be in one of a small set of supported formats — AC3 (Dolby Digital), MPEG audio, or PCM. AAC is not part of this specification, so hardware DVD players will not recognize or play it from a VOB file. Converting to AC3 at 192k ensures the audio is fully compatible with DVD players and authoring tools, and AC3 is the de facto standard audio format found on the vast majority of commercial DVDs.
A standalone VOB file is not sufficient for a playable DVD disc on its own. DVD-Video requires a specific disc structure, including a VIDEO_TS folder containing IFO (information) and BUP (backup) files alongside the VOB files, plus a properly defined title set. You would need to import this VOB into DVD authoring software such as DVD Styler, DVDFlick, or Nero Video to create the complete disc structure before burning. This tool produces the correctly encoded video/audio content as the raw ingredient for that process.
Subtitle handling depends on the format of the subtitles in your MP4 file. VOB files support DVD bitmap subtitles (dvd_subtitle format), but text-based subtitle formats like SRT or ASS used in MP4 containers cannot be automatically converted to DVD subtitle streams by a single FFmpeg command without additional processing. The basic conversion command on this tool does not include subtitle stream mapping, so subtitles will not carry over by default. To include subtitles, you would need to run a more complex FFmpeg command or handle them separately in your DVD authoring software.
To adjust video quality, change the -q:v value: lower numbers (closer to 1) produce higher quality and larger files, while higher numbers (up to 31) produce lower quality and smaller files. The default of 4 is a good balance for DVD content. To change audio quality, replace 192k in -b:a 192k with another value — DVD-compatible AC3 bitrates range from 128k up to 448k, with 192k and 224k being the most common on standard DVDs. For example, for higher-quality audio you could use '-b:a 320k'.
Yes. On Linux or macOS, you can loop over files in a directory using a shell command such as: 'for f in *.mp4; do ffmpeg -i "$f" -c:v mpeg2video -c:a ac3 -q:v 4 -b:a 192k -f vob "${f%.mp4}.vob"; done'. On Windows Command Prompt, use: 'for %f in (*.mp4) do ffmpeg -i "%f" -c:v mpeg2video -c:a ac3 -q:v 4 -b:a 192k -f vob "%~nf.vob"'. This is one of the main reasons the FFmpeg command is displayed on this page — for files over 1GB or batch jobs, running FFmpeg locally on your desktop is far more practical than the browser-based tool.
Technical Notes
MPEG-2 video in a VOB container is subject to DVD-Video bitrate constraints: the combined audio and video bitrate must not exceed 9.8 Mbps for reliable disc playback, and the video stream alone is typically kept between 4 and 8 Mbps. The -q:v parameter in FFmpeg's MPEG-2 encoder is a variable bitrate quality scale rather than a fixed bitrate target, so actual output bitrate will vary with scene complexity. If you need strict bitrate control for disc capacity planning, consider replacing -q:v with an explicit -b:v target such as '-b:v 6000k'. VOB files do not support chapter metadata — MP4 chapter markers will be silently dropped during this conversion, and chapters must be defined separately in your DVD authoring software. The MPEG-2 codec also has stricter resolution and framerate requirements than H.264: for standard DVD-Video, resolution should be 720x480 (NTSC) or 720x576 (PAL), and frame rates should match 29.97 or 23.976 fps for NTSC, or 25 fps for PAL. If your MP4 source has a different resolution or an unusual frame rate, you may need to add scaling and framerate flags (-vf scale=720:480, -r 29.97) to ensure the VOB output is accepted by DVD authoring tools. The '-f vob' flag instructs FFmpeg to write an MPEG program stream in VOB format rather than relying on file extension detection, which is important for correct container structure.