Extract hardcoded subtitles from videos using machine learning
Extract hardcoded subtitles from videos using the Tesseract OCR engine with Python.
Input a video with hardcoded subtitles:
import videocr print(videocr.get_subtitles('video.avi', lang='chi_sim+eng', sim_threshold=70))
0 00:00:01,042 --> 00:00:02,877 喝 点 什么 ? What can I get you? 1 00:00:03,044 --> 00:00:05,463 我 不 知道 Um, I'm not sure. 2 00:00:08,091 --> 00:00:10,635 休闲 时 光 … For relaxing times, make it... 3 00:00:10,677 --> 00:00:12,595 三 得 利 时 光 Bartender, Bob Suntory time. 4 00:00:14,472 --> 00:00:17,142 我 要 一 杯 伏特 加 Un, I'll have a vodka tonic. 5 00:00:18,059 --> 00:00:19,019 谢谢 Laughs Thanks.
The OCR process runs in parallel and is CPU intensive. It takes 3 minutes on my dual-core laptop to extract a 20 seconds video. You may want more cores for longer videos.
$ pip install videocr
videocr.get_subtitles( video_path: str, lang='eng', time_start='0:00', time_end='', conf_threshold=65, sim_threshold=90, use_fullframe=False)
Return the subtitles string in SRT format.
videocr.save_subtitles_to_file( video_path: str, file_path='subtitle.srt', lang='eng', time_start='0:00', time_end='', conf_threshold=65, sim_threshold=90, use_fullframe=False)
Write subtitles to
file_path. If the file does not exist, it will be created automatically.
Note that you can use more than one language. For example,
'hin+eng'means using Hindi and English together for recognition. More details are available in the Tesseract documentation.
Language data files will be automatically downloaded to your
$HOME/tessdatadirectory when necessary. You can read more about Tesseract language data files on their wiki page.
Extract subtitles from only a part of the video. The subtitle timestamps are still calculated according to the full video length.
Confidence threshold for word predictions. Words with lower confidence than this threshold are discarded. The default value is fine for most cases.
Make it closer to 0 if you get too few words from the predictions, or make it closer to 100 if you get too many excess words.
Similarity threshold for subtitle lines. Neighbouring subtitles with larger Levenshtein ratios than this threshold will be merged together. The default value is fine for most cases.
Make it closer to 0 if you get too many duplicated subtitle lines, or make it closer to 100 if you get too few subtitle lines.
By default, only the bottom half of each frame is used for OCR. You can explicitly use the full frame if your subtitles are not within the bottom half of each frame.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
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