The same resolution as the VOB video — a 1080p VOB produces 1920×1080 BMP frames; a 4K VOB produces 3840×2160 BMP frames. Use the resize utility after extraction if you want smaller thumbnails or social-media-sized crops.
קען איך אױסשטעלן װײַל װיפֿל ראָמען פֿון VOB װי BMP?
Almost always motion blur baked into the VOB source — the camera or subject was moving when the frame was captured. Pick timestamps from static scenes, or extract adjacent frames and choose the sharpest. The pipeline does not synthesize detail that was not there.