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Looking at the code, it appears that false is returned when the number of valid feature matches between the left and right stereo frames is lower than 6 (see here). Have you calibrated your camera properly and do you use rectified images as input for viso2? Also, are camera images somehow synchronized and not too blurry? I imagine the combination of bad synchronization and rolling shutter could be problematic.

Testing viso2 with a custom stereo system (with synced frames and calibrated using StereoCalibration) showed promising results for us (including linear/translational motion).