How to Convert Caption File Formats

  • There are many different types of caption file formats and sometimes you need to convert from one type to another. For example, let’s say you download a captions file from YouTube (SBV format) and want to use it to encode to video for iPhone, iPad, iPod, or iTunes. To do that you’ll need to convert it to the SCC format. If you want to use it with a Flash player you’ll probably need the DFXP format. And with a Windows Media Player you’ll need the SMI format. It seems that every application requires a different format, but it’s surprisingly difficult to convert between them. To address this problem, we created a free web tool that converts between all the major caption formats, including SRT, SBV, Flash DFXP, SCC, SMI or SAMI, CPT.XML, QT, and STL.

    Did you know you can use our caption encoding service to create a self-contained video with encoded closed captions that works with an iPhone and most other devices?
    Learn more about our caption encoding service

    The Caption Format Converter works instantly. Just paste your SRT or SBV file, and seconds later your selected output format will be emailed to you in an attachment that preserves the correct formatting. You can use this free service as much as you want. Let us know if you have any feedback or if there is anything else we can do to be helpful.

    caption format converter

    Below is a description of the major caption file formats:

    SRT – This is the most common subtitle/caption file format. It is a text format that originated in the DVD-ripping software SubRip and stands for “SubRip Subtitle” file.

    SBV – This is a YouTube caption file format that stands for “SubViewer.” It’s what you get when you download captions from YouTube. It’s a text format that is very similar to SRT.

    DFXP – This is a common format used for captioning Flash video. It’s a timed-text format that was developed by W3C and stands for “Distribution Format Exchange Profile”.

    SCC – Popular standard used web media, DVD, and for encoding closed captions for iTunes, iPods, iPads, and iPhones. It was originally developed by Sonic and stands for “Scenarist Closed Caption.”

    SMI or SAMI – Used for Windows Media video or audio. It was developed by Microsoft and stands for “Synchronized Accessible Media Interchange.”

    CPT.XML – XML format used for encoding captions into Flash video. It originated in the caption-embedding software Captionate.

    QT – Caption format used for QuickTime video or audio. It was developed by Apple.

    RT – RealText captions for RealMedia video or audio.

    STL – Used for DVD Studio Pro. It was developed by Spruce Technologies and known as “Spruce Subtitle File.”

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