Constant opencv::videoio::CAP_PROP_CODEC_EXTRADATA_INDEX

pub const CAP_PROP_CODEC_EXTRADATA_INDEX: i32 = 68;

Positive index indicates that returning extra data is supported by the video back end. This can be retrieved as cap.retrieve(data, ). E.g. When reading from a h264 encoded RTSP stream, the FFmpeg backend could return the SPS and/or PPS if available (if sent in reply to a DESCRIBE request), from calls to cap.retrieve(data, ).