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Topic: misleading comparator report. (Read 1055 times) previous topic - next topic
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misleading comparator report.

The statement at the beginning of comparison results is really helpful to avoid checking every item manually, which is great, but sometimes it can be misleading.

Quote
Differences found in all track pairs, out of which 1 became identical after applying offset and truncating first/last samples.

Comparing:
"D:\blah1a.ogg"
"D:\blah1b.webm"
Differences found: length mismatch - 7:21.113500 vs 7:21.120000, 21173448 vs 21173760 samples.
Compared 21173448 samples, discarded last 312 samples from the longer file.
Differences found within the compared range: 42345826 values, 0:00.000000 - 7:21.113479, peak: 1.309298 (+2.34 dBTP) at 1:08.178396, 1ch
Channel difference peaks: 1.309298 (+2.34 dBTP) 1.308699 (+2.34 dBTP)
File #1 peaks: 0.718134 (-2.88 dBTP) 0.713496 (-2.93 dBTP)
File #2 peaks: 0.718134 (-2.88 dBTP) 0.713496 (-2.93 dBTP)
Detected offset as 312 samples.

Comparing again with corrected offset...
Compared 21173136 samples, with offset of 312 discarding last/first samples from total of 21173448, discarded samples were not silent in either file.
No differences in decoded data found within the compared range.
Channel peaks: 0.718134 (-2.88 dBTP) 0.713496 (-2.93 dBTP)

Comparing:
"D:\blah2a.m4a"
"D:\blah2b.mp4"
Differences found: length mismatch - 7:21.109478 vs 7:21.155918, 19452928 vs 19454976 samples.
Compared 19452928 samples, discarded last 2048 samples from the longer file.
No differences in decoded data found within the compared range.
Channel peaks: 0.700423 (-3.09 dBTP) 0.700423 (-3.09 dBTP)



Total duration processed: 14:42.223
Time elapsed: 0:07.848
112.42x realtime

It correctly reports that all pairs contained differences, and also that one of them became identical after offset and truncation, but it fails to say that actually ALL pairs turned out identical after chopping them up, which results in the false perception that some actually contain differences.