#10924: Clean-up "ssim", "psnr" filter output
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Reporter: | Type:
MasterQuestionable | enhancement
Status: new | Priority: normal
Component: avfilter | Version:
| unspecified
Keywords: ssim psnr | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Related:
https://trac.ffmpeg.org/ticket/10922#comment:4
https://github.com/webmproject/libwebp/commit/33357131698ba0abb5b7a32b6f274f6f58170642#commitcomment-139962312
I noted unnecessary verbosity in the info output:
|1| Excessive trailing 0 of decimal.
|2| "All:1 (inf)" alike already implied the same for each
component. (pointless repeat)
Misleading part of "psnr":
|1| "min", "max" seem to just repeat "average"?
|2| "average" would be better renamed to "all": for consistency,
and it's really not the average of each component's sum.
|3| Probably mostly relevant to WebP only: the "a" (alpha)..?
(notably when the WebP has dummy alpha)
And "ssim" seems missing support for Alpha? (per
[https://ffmpeg.org/ffmpeg-filters.html#ssim the doc])
With dummy input alpha (as in WebP), would it make sense to
unconditionally ignore this channel?
Disclaimer:
I indeed don't quite understand these metrics.
Which I used mostly only for telling whether 2 images are
completely the same...
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Ticket URL: <https://trac.ffmpeg.org/ticket/10924>
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