Read vertical interval timecode (VITC) information from the top lines of a video frame.

The filter adds frame metadata key lavfi.readvitc.tc_str with the timecode value, if a valid timecode has been detected. Further metadata key lavfi.readvitc.found is set to 0/1 depending on whether timecode data has been found or not.

This filter accepts the following options:

scan_max

Set the maximum number of lines to scan for VITC data. If the value is set to -1 the full video frame is scanned. Default is 45.

thr_b

Set the luma threshold for black. Accepts float numbers in the range [0.0,1.0], default value is 0.2. The value must be equal or less than thr_w.

thr_w

Set the luma threshold for white. Accepts float numbers in the range [0.0,1.0], default value is 0.6. The value must be equal or greater than thr_b.