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SubRip is a software program for Windows which "rips" (extracts) subtitles and their timings from video. It is free software, released under the GNU GPL. SubRip is also the name of the widely used and broadly compatible subtitle text file format created by this software.

SubRip software

Using optical character recognition, SubRip can extract from live video, video files and DVDs, then record the extracted subtitles and timings as a Subrip format text file. It can optionally save the recognized subtitles as bitmaps for later subtraction (erasure) from the source video.

In practice, SubRip is configured with the correct codec for the video source, then trained by the user on the specific text area, fonts, styles, colors and video processing requirements to recognize subtitles. After trial and fine tuning, SubRip can automatically extract subtitles for the whole video source file during its playback. SubRip records the beginning and end times and text for each subtitle in the output text .srt file.

SubRip uses AviSynth to extract video frames from source video, and can rip subtitles from all video files supported by that program.

SubRip text file format

The SubRip file format, as reported on the Matroska multimedia container format website, is "perhaps the most basic of all subtitle formats." SubRip (SubRip Text) files are named with the extension .srt, and contain formatted lines of plain text in groups separated by a blank line. Subtitles are numbered sequentially, starting at 1. The timecode format used is hours:minutes:seconds,milliseconds with time units fixed to two zero-padded digits and fractions fixed to three zero-padded digits (00:00:00,000). The fractional separator used is the comma, since the program was written in France.

1. A numeric counter identifying each sequential subtitle
2. The time that the subtitle should appear on the screen, followed by --> and the time it should disappear
3. Subtitle text itself on one or more lines
4. A blank line containing no text, indicating the end of this subtitle

Formatting

Unofficially the format has very basic text formatting, which can be either interpreted or passed through for rendering depending on the processing application. Formatting is derived from HTML tags for bold, italic, underline and color:

• Bold – <b> ... </b> or {b} ... {/b}
• Italic – <i> ... </i> or {i} ... {/i}
• Underline – <u> ... </u> or {u} ... {/u}
• Font color – <font color="color name or #code"> ... </font> (as in HTML)

Nested tags are allowed; some implementations prefer whole-line formatting only.

Compatibility

The SubRip .srt file format is supported by most software video players listed in Comparison of video player software. For Windows software video players that do not support subtitle playback directly, the VSFilter DirectX filter displays SubRip and other subtitle formats. The SubRip format is supported directly by many subtitle creation/editing tools, and some hardware home media players. In August 2008, YouTube added subtitle support to its Flash video player under the "Closed Captioning" option - content producers can upload subtitles in SubRip format.

WebVTT

A format originally called WebSRT (Web Subtitle Resource Tracks) was as of October 2010 being specified by the Web Hypertext Application Technology Working Group for the proposed HTML5 <track> element. It shared the .srt file extension and was "broadly based on" (parts of) the SubRip format, but was not fully compatible with SubRip. The prospective format was later renamed WebVTT (Web Video Text Track). Support for the new format is limited but growing. Google's Chrome and Microsoft's Internet Explorer 10 browsers support <track> tags with WebVTT files for HTML5 videos already. Mozilla Firefox implemented WebVTT in its nightly builds (Firefox 24), and as of Firefox 31 (July 24th 2014), Mozilla has enabled WebVTT on Firefox by default. The feature had to be enabled in Firefox by going to the "about:config" page and setting the value of "media.webvtt.enabled" to true. YouTube began supporting WebVTT in April, 2013.

Text encoding

The SubRip .srt file format really only supports the Microsoft Windows text encoding default of CP-1252 (commonly, but incorrectly, referred to as ANSI). A Unicode byte order mark can be added to support any Unicode encoding with UTF-8 being preferred for its compatibility with CP-1252. However, a number of embedded hardware-based players only have support for non-Unicode fonts due to the licensing costs associated with the commercial fonts used.

SubRip .srt file encoding tools

Software tools to encode .srt subtitle files into video containers (avi, mkv, mp4, ...):

• Subtitles – Subtitles allows embedding and burning SRT files into any video, automatically performing character set conversion if required.
• MovieCaptioner – MovieCaptioner can both create SRT files and import them as well as other formats, and can convert other formats to SRT after importing them.
• FFmpeg – FFmpgeg supports also the Subtitles Character Encoding Conversion
• GPAC / MP4Box
• iSubtitle (MacOS)
• XMedia Recode – XMedia Recode is a free All-In-One video- and audio converter tool for Windows.
• YAMB (works with the command line version of MP4Box, e.g. MP4Box 0.4.6 rev2698)

See also

• Subtitles
• Closed Captioning
• Timed Text
• Comparison of video player software, subtitle ability
• Avidemux
• List of free television software
• MicroDVD
• SubStation Alpha
• Universal Subtitle Format
• DirectVobSub is able to extract subtitles from a DVD without first extracting the files from it.

Notes

1. ^ Zuggy, DVD, November 6, 2006.
2. SubRip Download on SourceForge
3. Thaureaux 2007, pp. 131–134
4. Zuggy, News, entry dated May 28, 2005.
5. Thaureaux 2007, p. 132
6. Thaureaux 2007, p. 136
7. ^ Zuggy, Guide.
8. Thaureaux 2007, p. 137
9. ^ "SRT Subtitles". matroska.org. CoreCodec Inc. Retrieved 2010-08-19.
10. SubRip (.SRT) subtitles support in players – ale5000.altervista.org
11. 陈波, 杨涛 (2006). 实用工具软件玩家攻略. 清华大学出版社. pp. 75–76. ISBN 978-7-302-11994-4. Retrieved 2010-09-11.
12. Martin, Chris (Dec 29, 2009). "15 best subtitle tools". aboutonlinetips.com; Binary Head. All apps listed support SubRip(SRT), but the article is specific about 7 of 15.
13. Staff (September 2003). "A DivX Player for the Living Room" (Neuston Maestro DVX-1201). Review. hardwaremag.com; Singapore HWM.
14. tokig (July 13, 2003). "Review of KiSS DP-500 – Playback". nordichardware.com; Nordic Hardware.
15. Argosy Media Player HV335T HDD(HD1080p) Product page argosy.com; Argosy, 2009.
16. Cericola, Rachel (2009-12-08). Western Digital WD TV Live HD Media Player Review. bigpicturebigsound.com; Big Picture Big Sound.
17. Suerte Felipe, Carlo (February 16, 2009). Get stylish with Samsung DVD-F1080. Manila Bulletin Publications. Retrieved 2010-08-19.
18. Chisholm and May: p. 82.
19. Understanding WebSRT format
20. WebSRT, from the WHATWG HTML draft specification, retrieved 2010-10-14
21. Kennedy, Antony; de Leon, Inayaili (2011). Pro CSS for High Traffic Websites. Apress. ISBN 978-1-4302-3288-9.
22. Pfeiffer, Silvia (June 27, 2011). "Recent developments around WebVTT".
23. "Firefox 31 Release Notes".
24. "Implement the track element".
25. "Caption File - YouTube Help".

References

• Thaureaux, Thierry (2007). DivX - Copiez vos vidéos sur CD (Nouvelle édition) (in French). Herblain, FR: Editions ENI. pp. 133–136. ISBN 978-2-7460-3812-7. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help); Invalid |ref=harv (help)
• Zuggy, T.V. "SubRip home". zuggy.wz.cz. Retrieved 2010-08-19. {{cite web}}: Invalid |ref=harv (help)
• Zuggy, T.V (December 8, 2005). "SubRip 1.20/1.50b – DVD subtitles ripper". zuggy.wz.cz. Retrieved 2010-01-10. {{cite web}}: Invalid |ref=harv (help) (Software release page.)
• Zuggy, T.V (August 1, 2007). "News page". zuggy.wz.cz. Retrieved 2009-07-02. {{cite web}}: Invalid |ref=harv (help)
• Zuggy, T.V (June 17, 2005). "Guide: Ripping subtitles from video files using SubRip". zuggy.wz.cz. Retrieved 2009-07-02.
• Xiao, Han (March 27, 2009). "Constructing Parallel Corpus from Movie Subtitles". In Li, Wenjie; Mollá-Aliod, Diego (eds.). Proc. Int. Conf. on Computer Processing of Oriental Languages. Hong Kong: Springer. pp. 329–336. doi:10.1007/978-3-642-00831-3_32. Retrieved 2009-07-02. {{cite book}}: Invalid |ref=harv (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
• Chisholm, Wendy; May, Matt (2008). Universal design for Web applications. O'Reilly Media. ISBN 978-0-596-51873-8. Retrieved 2010-06-28. {{cite book}}: Invalid |ref=harv (help)CS1 maint: multiple names: authors list (link)
• Bruegmann, Ulrich (2006). Divx R.t.f.m. – Divx 6 (in German). Lulu.com. ISBN 978-1-84728-676-5. {{cite book}}: Invalid |ref=harv (help)

External links

• Official website
• ".SRT SubRip file format specification". Doom9. Retrieved April 7, 2004. Derived from the SubRip source code
• WebVTT Standard
• Mozilla's developer page concerning WebVTT implementation
• SubRip (.SRT) subtitle features and support in players – comparison of .srt feature handling in a range of common players

• Subtitling
• Subtitle file formats
• Windows multimedia software
• Free television software