Read closed captioning (EIA-608) information from the top lines of a video frame.

This filter adds frame metadata for lavfi.readeia608.X.cc and lavfi.readeia608.X.line, where X is the number of the identified line with EIA-608 data (starting from 0). A description of each metadata value follows:

lavfi.readeia608.X.cc

The two bytes stored as EIA-608 data (printed in hexadecimal).

lavfi.readeia608.X.line

The number of the line on which the EIA-608 data was identified and read.

This filter accepts the following options:

scan_min

Set the line to start scanning for EIA-608 data. Default is 0.

scan_max

Set the line to end scanning for EIA-608 data. Default is 29.

spw

Set the ratio of width reserved for sync code detection. Default is 0.27. Allowed range is [0.1 - 0.7].

chp

Enable checking the parity bit. In the event of a parity error, the filter will output 0x00 for that character. Default is false.

lp

Lowpass lines prior to further processing. Default is enabled.