ID3 Tag Validator Application User Manual
Release 1.8 Revision F
25
Nielsen Confidential
Possible Causes of Failure
The following log messages may appear if Validator detects a time-gap between tags or if
tags “overlap” previous tags:
-52: Seqno Error and Gap in Tag Times (xx seconds): Sequence
Number xx, Tag time xx.
-74: Tag Time Error, Sequence Number xx: Tag overlaps previous
tag.
•
If a section of the audio stream does not contain watermarks for 10 seconds or
longer, the PCM-to-ID3 SDK does not generate an ID3 tag for that segment. A time
gap between consecutive tags would exist. The sequence numbers would be
consecutive, however, which indicates that no generated tags were dropped.
•
If ID3 tags are dropped in transmission or during the multiplexing process, a
sequence-number error accompanies the time-gap error.
Test 5 Result: Tag Duration Test
Format
Format
<number of tag duration errors / 0 / maximum
tolerated>
Number of Errors
Number of errors detected
0
Not used
Maximum Tolerated
Maximum number of errors tolerated before failure is declared
Meaning
Under ideal conditions, a DATA tag spans 10 seconds. If 10 watermarks arrive in less
than 10 seconds, the tag-duration is shorter. A tag that is shorter than 10 seconds is not
considered faulty.
Regardless of the number of watermarks or EDUs, Validator reports a tag-duration error
for any tag that is shorter than 4 seconds or longer than 12 seconds. For a description of
EDUs, see “EDUs (Elemental Data Units)” on page 46.
Example
The example below shows Validator found two tags that were shorter than 4 seconds or
longer than 12 seconds. The test passed because Validator allows up to seven such tag-
duration errors.
ID3 Tag: Tag Duration Test: Pass <2/0/7>
Possible Causes of Failure
The following log messages indicate that a tag was too short or too long:
