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SubStation Alpha

A subtitle file format created by CS Low (also known as Kotus) that allows for more advanced subtitles than the conventional SRT and similar formats.

SubStation Alpha (or Sub Station Alpha), abbreviated SSA, is a subtitle file format created by CS Low (also known as Kotus) that allows for more advanced subtitles than the conventional SRT and similar formats. This format can be rendered with VSFilter in conjunction with a DirectShow-aware video player (on Microsoft Windows), or MPlayer with the SSA/ASS library. It is also the name of the popular, now discontinued tool used to edit subtitles.

This subtitle format is frequently used in anime fansubs, either to overlay subtitles onto video while it is being encoded (hardsubbing), or to store subtitle data alongside video data in a Matroska (MKV) container (softsubbing). Hardsubbing is irreversible but does not require VSFilter or other special resources for playback. Softsubbing allows the end user to choose whether subtitles will be displayed, and makes it possible to include multiple subtitle streams in the same video file.

The current version of SSA is v4.08. There are many freeware and open source subtitling applications that support the SSA format.

Key Terms

advanced subtitles
cs low
definition
kotus
ssa
sub station alpha
substation alpha
subtitle file format
subtitles
usage

Additional Resources

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Acronymn

SSA

Synonymns

SubStation Alpha
(none found)

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Sources & Credits

Last modified on May 3 2020
Content adapted from Wikipedia
No credits found.
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