https://bugs.kde.org/show_bug.cgi?id=357153
Paul Konecny <p...@konecny.at> changed:
What |Removed |Added
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CC| |p...@konecny.at
--- Comment #5 from Paul Konecny <p...@konecny.at> ---
I reported the issue to Vincent when he did the initial rewrite (around the
time of Cafe#2 I think)
and he changed the behaviour to correctly handle crf codecs because of that.
The problem is that codecs using a constant rate factor (crf), such as HEVC,
VP9 or H.264, increase quality with a decreasing crf value (inverse logarithmic
quality curve).
Codecs with a fixed bit rate increase quality with analogue to the bit rate
value.
At first crf codecs were handled like fixed codecs so increasing the value
decreased quality dramatically and Vincent fixed that which is the behaviour
that confused you.
In my opinion it would be best to indicate what is changed when a certain codec
is selected.
For instance, when a codec using crf is detected show a text field reading
"CRF:" before the Video value.
On the other hand when a codec with a fixed bitrate is selected show "MBit/s:"
instead.
Cheers!
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