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sprangerik committed Oct 22, 2024
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29 changes: 14 additions & 15 deletions webrtc-stats.html
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Expand Up @@ -1792,27 +1792,26 @@ <h2>
corruption-detection</a> header extension has been negotiated, corruptioned probability
measurements SHOULD be [= map/exist | present =].
</p>
<p class="note">
Note that the corruption-detection header extension documented at
http://www.webrtc.org/experiments/rtp-hdrext/corruption-detection is experimental. The
identifier and format may change once an IETF standard has been established.
</p>
<p class="note">
The user agent MAY produce corruption likelihood measurements using any method available.
That could be facilitated by e.g. the mentioned corruption detection header extension,
reference-less image analysis such as natural image statistics, ML-based classification,
or anything else capable of producing an estimate.
</p>
<p class="note">
Note that these values are estimates - not guarantess. Even if the estimate is 0.0 there
could be corruptions present (i.e. it's a false negative) for instance if random sampling
is used and only a very small area of the frame is affected. Similarly, even if the estimate
is 1.0 there might not be corruptions present (i.e. it's a false positive) for instance if
the distribution of per-macroblock quantization parameters is extremely wide.

or anything else capable of producing an estimate.<br>
<br>
The corruption likeliehood values are estimates - not guarantess. Even if the estimate is
0.0 there could be corruptions present (i.e. it's a false negative) for instance if random
sampling is used and only a very small area of the frame is affected. Similarly, even if the
estimate is 1.0 there might not be corruptions present (i.e. it's a false positive) for
instance if an image recognition technique is used while presenting a screenshot of a
video encoding corruption.<br>
Just like there are edge cases for e.g. PSNR measrumenets, these metrics should primarily
be used as a basis for statistical analysis rather than be used as an absolute truth on a
per-frame basis.
per-frame basis.<br>
<br>
The corruption-detection header extension documented at
<a href="http://www.webrtc.org/experiments/rtp-hdrext/corruption-detection">
http://www.webrtc.org/experiments/rtp-hdrext/corruption-detection</a> is experimental. The
identifier and format may change once an IETF standard has been established.
</p>
</dd>
</dl>
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