TL;DR: DVD subtitles are not text — they are VobSub images (a .sub picture track plus an .idx index), so no tool can save them straight to SRT. You rip the VobSub track off the disc, then OCR the images into text. The one exception is a bootleg or screen-capture where the subtitle is burned into the picture, which needs frame OCR instead.
What format are DVD subtitles in?
DVD subtitles use a format called VobSub. It is not one file but a pair: a .sub file that holds the actual subtitle pictures, and a .idx file that holds the timing and index that tells the player when to show each picture. Every subtitle line on a commercial DVD is stored as a small rendered image of the text — the same idea as Blu-ray PGS subtitles, just the DVD equivalent.
Because the subtitle is a picture and not characters, there is no text inside the file to copy out. A subtitle editor or a video platform that expects SRT will not be able to read it. DVD subtitles are image-based, so turning them into an editable SRT always needs OCR — no format converter can do it, because there is no text in the file to convert.
How do I rip the subtitle track off a DVD?
The first obstacle is physical: you need a DVD drive to read the disc. Almost no modern laptop has one built in, and no Mac has for years, so in practice you plug in an external USB DVD drive.
With the disc readable, there are two common ways to get the subtitle track:
- Rip the disc to an MKV file with MakeMKV or HandBrake. This keeps the VobSub subtitle track alongside the video, so you end up with the subtitle pictures preserved inside an MKV.
- Pull the VobSub track directly with tools like vobcopy or mkvextract, which write out the raw
.idx+.subpair.
Either way, the result is the same VobSub data — a .idx/.sub pair, or a VobSub track sitting inside an MKV. Ripping the disc gets the subtitle out of the DVD, but it is still pictures — you have moved the images off the disc, not turned them into text.
How do I turn VobSub into an SRT?
This is the OCR step, and it is unavoidable: the .sub images have to be read character by character to become text. On Windows, the usual tool is Subtitle Edit, which has a built-in OCR pass for VobSub.
On a Mac, the practical route is to render the VobSub onto the video and run GeekLink's subtitle OCR. It reads the subtitle text from the frames and exports a clean, correctly timed SRT — locally on your Mac, with nothing uploaded. From there the SRT opens in any editor, or you can translate it and export a bilingual file.
Whichever tool you use, converting VobSub to SRT is an OCR job, not a file conversion — the images become an editable subtitle only after the text is read out of them.
What if the DVD subtitle is burned into the picture?
Some discs are not clean commercial pressings. Bootlegs, fan rips, and screen-captures often have the subtitle text baked directly into the video, with no separate subtitle track at all. If you rip a disc like that and find no VobSub track, that is why.
When the text is burned in, there is nothing to rip — the subtitle is part of the picture. The only way to recover it is to OCR the video frames themselves. If a DVD rip has no subtitle track but you still see subtitles playing, they are burned into the picture, and OCR on the video is the only way to get them out. GeekLink does this on a Mac, reading the text straight from the frames into timed subtitle lines.
How do I do all of this on a Mac?
On a Mac there are really two routes, and which one you take depends on what the disc actually contains:
- The disc has a VobSub subtitle track. Rip it to an MKV (keeping the subtitle track), render the VobSub onto the video, and run GeekLink's OCR to get a timed SRT.
- The subtitle is burned into the picture. There is no track to rip — import the video into GeekLink and OCR the frames directly.
In both cases GeekLink runs the OCR locally and offline on your Mac and exports a timed SRT, so the whole subtitle stays on your machine. Beyond OCR, the same app handles speech recognition with Whisper if a disc has no usable subtitle at all, AI translation into 40+ languages, a subtitle editor, and batch processing so a whole box set of episodes can be queued in one run. GeekLink is the answer for the OCR and localization steps; the disc still has to be read and ripped with a DVD drive and a tool like MakeMKV first.
FAQ
What is a .idx/.sub file?
It is a VobSub subtitle track from a DVD. The .sub holds the subtitle pictures and the .idx holds the timing. It is image-based, so it needs OCR to become an SRT.
Can VLC extract DVD subtitles to SRT?
No. VLC can display and switch between subtitle tracks, but it has no feature to export a track as a subtitle file. And because VobSub is images, even after you get the track out you still need OCR to turn it into SRT.
My DVD subtitles came out as .sub, not .srt — why?
Because they are pictures, not text. Extraction preserves the pictures as a .sub file, and only OCR turns those pictures into an editable SRT.
Can I get a DVD subtitle in a different language?
Only if that language is on the disc. A DVD carries a fixed set of subtitle tracks pressed onto it; you can extract any of those, but you cannot create a language the disc does not include. To get another language, translate an extracted track.
Do I need a DVD drive to do this?
Yes, to read the disc. It is usually an external USB DVD drive, since Macs and most laptops no longer include one built in.