Timestamp issues in CSV files at high fps recordings with stereo cameras

[BZandi]

When choosing a high fps (e.g. 120 Hz) in stereo mode, the timestamp seems to count backwards. Probably this is related to the way the frames are fetched from the camera's buffer, as the timestamp should be accurate. A current workaround is to re-order the data during pre-processing.

Further, in stereo mode, it is possible that some timestamps occur twice, which might be traced back to rounding issues in PupilEXT.