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IDProjectCategoryView StatusDate SubmittedLast Update
0003238KdenliveEffectspublic2014-03-29 01:282014-08-06 00:44
Assigned Tovpinon 
StatusresolvedResolutionno change required 
Platform64 bitOSGentoo LinuxOS Version
Product Version0.9.6 
Target VersionFixed in Version 
Summary0003238: Video fades (fade in/out) requires more frames then needed
DescriptionTheoretically fades to/from black require 1 frame minimum, from normal to totally black and from black to normal accordingly. In practice in order to fade to complete black frame more then 10 frames required for 25 fps clip.

Expected behavior - fully black frames at the begin and the end of the effects, independently from the effects length.
Steps To ReproduceApply fade out effect, change its duration to 0000007:0000010 frames and see gray (not black) frame.
TagsNo tags attached.
Build/Install MethodDistribution package
Attached Filespng file icon screenshot3.png [^] (120,445 bytes) 2014-03-29 01:28

gif file icon fade-fail.gif [^] (106,783 bytes) 2014-04-08 11:42

- Relationships

-  Notes
varchar (reporter)
2014-03-29 01:41

Oops, wrong screenshot attached. 12 frames gives black end, even 10, but 7-8 - no.
maverickp (reporter)
2014-03-29 22:31

It also happens to me
varchar (reporter)
2014-04-08 11:43

Figured out that fade to black actually doesn't fade to _BLACK_ NEVER! Don't be fooled with frame that _LOOKS_ black. It doesn't black actually, use xgamma or look at my animated screenshot.

Solution for fade to real black can be seen on screenshot too - just leave one empty frame behind fade.
vpinon (administrator)
2014-04-30 22:54

I think this problem is a matter of choice as in any sampled math function: is it useful to include the zero in our set or keep only sample with information?
The problem gets visible only when the slope approaching zero is sharp (fade in few frames)
If fade includes the end black frame, then we would get 2 black frames when chaining with the next fade, and it would not be of someone else' taste.
At 25 fps is the full black missing visible?

- Issue History
Date Modified Username Field Change
2014-03-29 01:28 varchar New Issue
2014-03-29 01:28 varchar File Added: screenshot3.png
2014-03-29 01:41 varchar Note Added: 0009815
2014-03-29 22:31 maverickp Note Added: 0009825
2014-04-08 11:42 varchar File Added: fade-fail.gif
2014-04-08 11:43 varchar Note Added: 0009963
2014-04-30 22:54 vpinon Note Added: 0010019
2014-08-06 00:44 vpinon Status new => resolved
2014-08-06 00:44 vpinon Resolution open => no change required
2014-08-06 00:44 vpinon Assigned To => vpinon

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