smacke/srt

srt is a tiny but featureful Python library for parsing, modifying, and composing SRT files. Take a look at the quickstart for a basic overview of the library. Detailed API documentation is also available.

Want to see some examples of its use? Take a look at the tools shipped with the library.

Why choose this library?

Extremely lightweight, ~150 lines of code excluding docstrings
Simple, intuitive API
High quality test suite using Hypothesis
100% test coverage (including branches)
Well documented API, at both a high and low level
~30% faster than pysrt on typical workloads
Native support for Python 2 and 3
Full support for PyPy
No dependencies outside of the standard library
Tolerant of many common errors found in real-world SRT files
Support for Asian-style SRT formats (ie. "fullwidth" SRT format)
Completely Unicode compliant
Released into the public domain
Real world tested — used in production to process thousands of SRT files every day
Portable — runs on Linux, OSX, and Windows
Tools included — contains lightweight tools to perform generic tasks with the library

Usage

Tools

There are a number of tools shipped with the library to manipulate, process, and fix SRT files. Here's an example using hanzidentifier to strip out non-Chinese lines:

$ cat pe.srt
1
00:00:33,843 --> 00:00:38,097
Only 3% of the water on our planet is fresh.
地球上只有3%的水是淡水

2
00:00:40,641 --> 00:00:44,687
Yet, these precious waters are rich with surprise.
可是这些珍贵的淡水中却充满了惊奇

$ srt lines-matching -m hanzidentifier -f hanzidentifier.has_chinese -i pe.srt
1
00:00:33,843 --> 00:00:38,097
地球上只有3%的水是淡水

2
00:00:40,641 --> 00:00:44,687
可是这些珍贵的淡水中却充满了惊奇

These tools are easy to chain together, for example, say you have one subtitle with Chinese and English, and other with French, but you want Chinese and French only. Oh, and the Chinese one is 5 seconds later than it should be. That's easy enough to sort out:

$ srt lines-matching -m hanzidentifier -f hanzidentifier.has_chinese -i chs+eng.srt |
>     srt fixed-timeshift --seconds -5 |
>     srt mux --input - --input fra.srt

See the srt_tools/ directory for more information.

Library

Detailed API documentation is available, but here are the basics:

>>> # list() is needed as srt.parse creates a generator
>>> subs = list(srt.parse('''\
... 1
... 00:00:33,843 --> 00:00:38,097
... 地球上只有3%的水是淡水
...
... 2
... 00:00:40,641 --> 00:00:44,687
... 可是这些珍贵的淡水中却充满了惊奇
...
... 3
... 00:00:57,908 --> 00:01:03,414
... 所有陆地生命归根结底都依赖於淡水
...
... '''))
>>> subs
[Subtitle(index=1, start=datetime.timedelta(0, 33, 843000), end=datetime.timedelta(0, 38, 97000), content='地球上只有3%的水是淡水', proprietary=''),
 Subtitle(index=2, start=datetime.timedelta(0, 40, 641000), end=datetime.timedelta(0, 44, 687000), content='可是这些珍贵的淡水中却充满了惊奇', proprietary=''),
 Subtitle(index=3, start=datetime.timedelta(0, 57, 908000), end=datetime.timedelta(0, 63, 414000), content='所有陆地生命归根结底都依赖於淡水', proprietary='')]
>>> print(srt.compose(subs))
1
00:00:33,843 --> 00:00:38,097
地球上只有3%的水是淡水

2
00:00:40,641 --> 00:00:44,687
可是这些珍贵的淡水中却充满了惊奇

3
00:00:57,908 --> 00:01:03,414
所有陆地生命归根结底都依赖於淡水

Installation

To install the latest stable version from PyPi:

pip install -U srt

To install the latest development version directly from GitHub:

pip install -U git+https://github.com/cdown/srt.git@develop

Testing

tox

smacke / srt