1. A system to detect garbled closed captioning data, comprising: a receiver to receive an encoded video data stream containing closed captioning data; a decoder to decode the encoded video data stream, and to reorder frames in the encoded video stream into display order; a closed captioning data detector to detect closed captioning data in the decoded, reordered video data stream; a data extractor to extract individual data elements from the detected closed captioning data; a data counter to count a total number of data elements in the closed captioning data as a total data element count, and to count a total number of data elements in the closed captioning data having a particular characteristic as a total data element characteristic count; a memory in which to store the total data element count and the data element characteristic count in the memory; a garbled closed captioning data detector to determine a metric as a function of the total data element count and the total data element characteristic count; and an alert generator that generates an alert in accordance with the determined metric.
1. A system to detect garbled closed captioning data, comprising: a receiver to receive an encoded video data stream containing closed captioning data; a decoder to decode the encoded video data stream, and to reorder frames in the encoded video stream into display order; a closed captioning data detector to detect closed captioning data in the decoded, reordered video data stream; a data extractor to extract individual data elements from the detected closed captioning data; a data counter to count a total number of data elements in the closed captioning data as a total data element count, and to count a total number of data elements in the closed captioning data having a particular characteristic as a total data element characteristic count; a memory in which to store the total data element count and the data element characteristic count in the memory; a garbled closed captioning data detector to determine a metric as a function of the total data element count and the total data element characteristic count; and an alert generator that generates an alert in accordance with the determined metric. 3. The system recited in claim 1 , wherein the total data element count and total data element characteristic count are determined over an interval, the metric is determined over the interval, and the alert is provided, if at all, at the end of the interval.