Bug 389220 - "alphain" transition doesn't work
Summary: "alphain" transition doesn't work
Status: RESOLVED WORKSFORME
Alias: None
Product: kdenlive
Classification: Applications
Component: Effects & Transitions (show other bugs)
Version: Appimage - Refactoring
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Vincent PINON
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-01-19 18:59 UTC by unfa
Modified: 2022-12-31 05:23 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
fritzibaby: Brainstorm+


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Description unfa 2018-01-19 18:59:38 UTC
I use an alphain transition (as  compositor basically) to use a grayscale image on one track as an alpha mask for video underneath - this way I can achieve a nice composit of two videos.

In Kdenlive 17.04.3 it works.
In kdenlive 17.12.0 it doesn't work any more. Another effects seem to work fine, but this one that I need so much doesn't. I don't know of another way to achieve this effect in Kdenlive and it's key to do what I want to do. I tried everything for hours and came up with "alphain".

I know I could use multiply with an inverted mask on the background and multiply with non-inverted mask on the foreground and then add both together. However that adds more layers to achieve the same effect and probably also will hit the rendering performance.
Comment 1 emohr 2018-12-28 17:40:26 UTC
I confirm. It seems all Alpha transitions don’t work.
Tested with AppImage 18.12.0d, Refactoring, Windows 18.12.0.
Comment 2 emohr 2021-03-24 17:42:56 UTC
Still not working with 20.12.3.
Comment 3 Julius Künzel 2022-12-01 22:02:32 UTC
Can you please test again? With the latest nightly? There have been some alpha fixes recently and in my tests it seems fixed. Please read https://docs.kdenlive.org/en/effects_and_compositions/transitions/alpha_operation_transitions.html to make sure you are expecting the correct behaviour.
Comment 4 Bug Janitor Service 2022-12-16 05:13:25 UTC
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
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If you have already provided the requested information, please
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Thank you for helping us make KDE software even better for everyone!
Comment 5 Bug Janitor Service 2022-12-31 05:23:34 UTC
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!