How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

When a video is ripped from a DVD with subtitles, it’s in IDX+SUB format. VOB subtitles in IDX format are images repackaged from the DVD as .SUB files. Unlike text-based SRT files, the combo of the SUB and IDX file instructs the player where to place and format the subtitles, including bold, italics, etc. This allows for subtitles to be positioned near the speaker and for easy identification.

How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

The combo of SUB and IDX files may work on players like GOM, POT Player, and VLC, but they may not be compatible with your phone, handheld, casting devices, and TV. To ensure compatibility, it’s best to use .SRT format subtitles, which can be downloaded from various online sources.

However, a common issue with online .SRT subtitles is imperfect syncing. Even if you manually sync the beginning, it may go out of sync towards the end. In these cases, converting the subtitles is the best solution. The only challenge is that IDX/SUB files are not text but images, requiring extra effort for conversion. To help you with this process, here is a step-by-step guide.

Converting IDX/SUB Subtitle to SRT

Step 1: Download Subtitle Edit tool from Niesk.dk. The program is available as a portable ZIP file that can be extracted to a folder or saved as an installer. I recommend the portable version. Subtitle Edit has many features, but for this article, I will focus on converting IDX files to SRT files. Feel free to explore the tool on your own. Step 2: When launching the application, you will see this screen. Click on the Open button and load the SUB subtitle to the app. Make sure the .IDX file is in the same directory and has the same file name as the SUB file. If not, importing the subtitles will result in errors.

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How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

Step 3: Once the subtitle is imported, the tool will load the OCR module to convert the images to text. Configure the settings on this page to ensure a seamless process and handle non-dictionary words. Finally, click “Start OCR”.

How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

Step 4: The tool will start the OCR process, which may take some time. The OCR is almost perfect with minimal errors. If the tool detects any potential issues, it will highlight the line for your review after the conversion is complete.

How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

Step 5: After the process completes, review the subtitle and save it as an SRT file format. The new SRT file will be perfectly in sync with the DVD subtitle, allowing you to enjoy the movie on your TV.

How to Convert IDX/SUB (DVD) Subtitle to a .SRT Subtitle

Online IDX/SUB to SRT Converter

If you’re seeking an online tool to convert IDX/SUB files to SRT format easily, you’re out of luck. I attempted to find online tools for this conversion but was unsuccessful. None of the tools could convert IDX files to SRT as desired.

Your best option is Subtitle Edit, which minimizes manual work and errors. However, if you discover a superior tool with online, bulk conversion capabilities that is user-friendly, please inform us in the comments or forum.

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