|Stable release||1.50b4 / November 7, 2006|
|Preview release||1.50b5 / April 30, 2011|
|Operating system||Microsoft Windows|
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
SubRip text file format 
|Internet media type||
The SubRip file format is "perhaps the most basic of all subtitle formats." SubRip (SubRip Text) files are named with the extension
.srt, and contain formatted plain text. The time format used is hours:minutes:seconds,milliseconds. The decimal separator used is the comma, since the program was written in France. The line break used is often the CR+LF pair. Subtitles are numbered sequentially, starting at 1.
SubRip .srt file example 
1 00:00:10,500 --> 00:00:13,000 Elephant's Dream
2 00:00:15,000 --> 00:00:18,000 At the left we can see...
.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.
A format 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 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. The main differences are:
Unicode support 
.srt file format supports any text encoding including ANSI, Unicode Little Endian, Unicode Big Endian, UTF-8. Byte order mark can be used to define encoding unambiguously. Further Unicode support is up to if the media player uses a Unicode font. Due to font licensing restrictions most embedded systems only support ISO-8859 fonts.
SubRip .srt file encoding tools 
Software tools to encode
.srt subtitle files into video containers (avi, mkv, mp4, ...):
- 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 
- Comparison of video player software, subtitle ability
- SubStation Alpha
- Universal Subtitle Format
- DirectVobSub is able to extract subtitles from a DVD without first extracting the files from it.
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