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export subtitles to srt file

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This commit is contained in:
Yi Ge 2019-04-27 00:28:17 +02:00
parent 99c58555ea
commit e55c17c325
1 changed files with 17 additions and 10 deletions
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27
videocr/video.py
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@ -48,7 +48,7 @@ class Video:
def get_subtitles(self) -> str:
self._generate_subtitles()
return ''.join(
'{}\n{} --> {}\n{}\n'.format(
'{}\n{} --> {}\n{}\n\n'.format(
i,
self._srt_timestamp(sub.index_start),
self._srt_timestamp(sub.index_end),
@ -60,10 +60,10 @@ class Video:
if self.pred_frames is None:
raise AttributeError(
'Please call self.run_ocr() first to generate ocr of frames')
'Please call self.run_ocr() first to perform ocr on frames')
# divide ocr of frames into subtitle paragraphs using sliding window
WIN_BOUND = int(self.fps / 2) # 1/2 sec sliding window boundary
WIN_BOUND = int(self.fps // 2) # 1/2 sec sliding window boundary
bound = WIN_BOUND
i = 0
j = 1
@ -95,15 +95,22 @@ class Video:
# merge new sub to the last subs if they are similar
while self.pred_subs and sub.is_similar_to(self.pred_subs[-1]):
lsub = self.pred_subs[-1]
ls = self.pred_subs[-1]
del self.pred_subs[-1]
sub = PredictedSubtitle(lsub.frames + sub.frames)
sub = PredictedSubtitle(ls.frames + sub.frames)
self.pred_subs.append(sub)
def _srt_timestamp(self, frame_index) -> str:
time = str(datetime.timedelta(seconds=frame_index / self.fps))
return time.replace('.', ',') # srt uses comma, not dot
def _srt_timestamp(self, frame_index: int) -> str:
td = datetime.timedelta(seconds=frame_index / self.fps)
ms = td.microseconds // 1000
m, s = divmod(td.seconds, 60)
h, m = divmod(m, 60)
return '{:02d}:{:02d}:{:02d},{:03d}'.format(h, m, s, ms)
def save_subtitles_to_file(self, path='subtitle.srt') -> None:
with open(path, 'w+') as f:
f.write(self.get_subtitles())
time_start = timeit.default_timer()
@ -113,6 +120,6 @@ time_stop = timeit.default_timer()
print('time for ocr: ', time_stop - time_start)
time_start = timeit.default_timer()
v.get_subtitles()
v.save_subtitles_to_file()
time_stop = timeit.default_timer()
print('time for get sub: ', time_stop - time_start)
print('time for save sub: ', time_stop - time_start)