THE ALMIRA GUIDE
Understanding VIDEO_TS folders before converting DVD video
Understand VOB, IFO, BUP, menu files, and DVD segments. Learn what browser conversion can do and when a desktop tool is needed.
The three common DVD file types
A VIDEO_TS folder commonly contains VOB, IFO, and BUP files. VOB files hold audiovisual material along with other DVD information. IFO files describe structure and playback instructions. BUP files are backup copies of navigation information. An IFO or BUP is not a standalone movie and cannot become one by changing its extension. Preserve the original folder so a DVD-aware application can interpret it later. This guide applies to accessible, unencrypted files that you are entitled to process.
Menu files and main segments
VIDEO_TS.VOB and files such as VTS_02_0.VOB often contain menu material. Files such as VTS_02_1.VOB and VTS_02_2.VOB may be segments within the same title set. Almira uses these names to help organize selections and exclude likely menu files from main-segment suggestions. A title set is not necessarily one complete movie. Episodes, multiple angles, and unusual disc authoring can create playback structures more complicated than filename order. Do not automatically concatenate everything in a folder.
A careful workflow for family recordings
First keep a backup of the source folder. Open DVD / VOB mode and use folder selection if your browser supports it, or choose several VOB files manually. Review the detected groups and identify the material you actually want. Convert one short segment separately to check picture and sound. Do not delete IFO or BUP files from your archive simply because the browser converter does not use them. They can remain important for a different DVD-aware workflow later.
What experimental joining means
Joining requires compatible streams and a combined input within the 1 GiB job limit. Review numeric segment order, remove menus, and avoid combining unrelated title sets. Available browser memory can still make a smaller job fail, because the application needs resources for decoding and output too. Successful encoding does not prove the movie order was correct. Play across each join and listen for gaps or synchronization problems. If the sequence is wrong, return to the original folder rather than treating the output as an archive.
What an MP4 does not preserve
A conventional MP4 is not an interactive DVD. This workflow does not preserve disc menus, interpret every title or chapter, access a physical DVD drive, or bypass encryption. Almira does not advertise ISO conversion. Subtitles and additional audio streams require explicit support; do not assume every stream from the source is included in the result. Verify the output against your needs and use the original folder when you require features beyond this browser tool’s scope.
When a desktop converter is the right choice
Choose a DVD-aware desktop application for full title navigation, chapter handling, long recordings, complex subtitles, or jobs that consistently exhaust browser resources. Browser conversion is useful for accessible individual clips and small reviewed groups. It is not a replacement for every DVD-authoring capability. For an important archive, keep the original folder and a second backup. Treat the MP4 as a viewing copy. Start with the single-file VOB guide when you only need one clip.
Keep learning
- How to convert VOB to MP4 without uploading your video
- Make an MP4 smaller: quality and resolution explained
- How private browser video conversion works
- Video conversion stuck or failed? A troubleshooting guide
Technical references
Read the ffmpeg.wasm overview, engine limitations, and FFmpeg format documentation. These guides describe Almira's browser workflow, rather than every capability of native FFmpeg.
Convert a video locallyQuestions or corrections? info@video-converter.altergygroup.com