[Webkit-unassigned] [Bug 181033] New: <img> decode single frame h264 and hevc slower than jpg

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=181033

            Bug ID: 181033
           Summary: <img> decode single frame h264 and hevc slower than
                    jpg
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: colin at bendell.ca

Comparing the decode time of a single frame h264 or hevc compared to jpg is much slower compared to jpg. 

https://github.com/colinbendell/webperf/img-decode/index.html

When testing locally (network transfer near 0) I get the following results while measuring the image.decode time on High Sierra with TP45:

JPG Decode: 7 ms
h264 Decode: 54 ms
hevc Decode: 47 ms

This is from a looping test of 10 iterations selecting the median result. The results are generally consistent that jpg decode is faster than h264/hevc single frame.

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