Samples the video at sample_fps; only samples whose 160 px grey image differs fr...
https://ton.halowerk.com/v1/video-text-ocrOverview
Samples the video at sample_fps; only samples whose 160 px grey image differs from the last OCR frame (more than 0.3 % of pixels changing by more than 24 levels) are read again, at most max_ocr_frames per call (the largest changes win). The chosen frames are re-extracted at up to 1280 px width (small videos are upscaled 2x) and read with Tesseract 5.3.4 (LSTM, sparse-text mode, Ubuntu tessdata eng/deu, Apache-2.0).