pysrt

pysrt is a Python library used to edit or create SubRip files.

Foreword

pysrt is mainly designed as a library, but if you are experiencing troubles with bad subtitles you can first try to use ruby-osdb which will try to find the best subtitle for your movie. If you are still unlucky pysrt also provide an srt command useful for either shift, split, or rescale a .srt file.

Command Usage

Shifting:

$ srt -i shift 2s500ms movie.srt

Spliting:

$ srt split 58m26s movie.srt

Rescaling:

$ srt -i rate 23.9 25 movie.srt

Installation

pysrt is available on pypi. To intall it you can use either

pip:

$ sudo pip install pysrt

or distutils:

$ sudo easy_install pysrt

Library Usage

Import:

>>> from pysrt import SubRipFile

Parsing:

>>> subs = SubRipFile.open('some/file.srt')
# If you get a UnicodeDecodeError try to specify the encoding
>>> subs = SubRipFile.open('some/file.srt', encoding='iso-8859-1')

SubRipFile are list-like objects of SubRipItem instances:

>>> len(first_sub)
>>> first_sub = subs[0]

SubRipItem instances are editable just like pure Python objects:

>>> first_sub.text = "Hello World !"
>>> first_sub.start.seconds = 20
>>> first_sub.end.minutes = 5

Shifting:

>>> subs.shift(seconds=-2) # Move all subs 2 seconds earlier
>>> subs.shift(minutes=1)  # Move all subs 1 minutes later
>>> subs.shift(ratio=25/23.9) # convert a 23.9 fps subtitle in 25 fps
>>> first_sub.shift(seconds=1) # Move the first sub 1 second later
>>> first_sub.start += {'seconds': -1} # Make the first sub start 1 second earlier

Removing:

>>> del subs[12]

Slicing:

>>> part = subs.slice(starts_after={'minutes': 2, seconds': 30}, ends_before={'minutes': 3, 'seconds': 40})
>>> part.shift(seconds=-2)

Saving changes:

>>> subs.save('other/path.srt', encoding='utf-8')