0001786: Image transparency lost with grayscale effect + affine transition

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Project

Category

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Date Submitted

Last Update

0001786

Kdenlive

MLT

public

2010-08-31 15:45

2010-09-14 23:01

Reporter

tidris769

Assigned To

ddennedy

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

fixed

Platform

32-bit intel

ubuntu linux

OS Version

9.10

Product Version

Recent git

Target Version

Fixed in Version

0.7.8

Summary

0001786: Image transparency lost with grayscale effect + affine transition

Description

Using an image with transparent background as top clip + affine transition + red color as bottom clip. Adding the grayscale effect to the top clip results in the transparent background drawn white over the bottom clip when project is played in kdenlive or melt. If project is rendered to MPEG-4 the transparent background is drawn black instead of white over the bottom clip. This problem doesn't happen if the transition is composite instead of affine.

Using svn 4796 + today's MLT but also happens in previous versions.

Steps To Reproduce

- Play attached project in kdenlive and melt. First half uses affine transition, second half uses composite transition. Note white background during first half.
- Render project to MPEG-4. Note black background during first half.
- Disable grayscale effect on top clip and play again. Note the white background is gone during first half.

Tags

No tags attached.

Build/Install Method

(select)

Attached Files

bug3.tar.gz [^] (364,386 bytes) 2010-08-31 15:45

composite.png [^] (148,963 bytes) 2010-09-04 23:57

affine.png [^] (159,742 bytes) 2010-09-04 23:57

Relationships

Notes
(0005775) j-b-m (administrator) 2010-09-04 23:58 edited on: 2010-09-05 00:00	Issue can be reproduced with MLT: melt colour:red -track transparent.png -attach sepia -transition composite in=0 out=200 progressive=1 gives the attached image composite.png melt colour:red -track transparent.png -attach sepia -transition affine in=0 out=200 progressive=1 gives the attached image affine.png Looks like the affine transition has issues with alpha channel. The problem only occurs if you attach an effect to the last track... Dan, could you have a look?

(0005791) ddennedy (developer) 2010-09-06 08:38	Fixed in mlt git commit f9dbf1. Thank you for the good bug report. This bug actually had a much larger impact than just this isolated case.

Issue History
Date Modified	Username	Field	Change
2010-08-31 15:45	tidris769	New Issue
2010-08-31 15:45	tidris769	File Added: bug3.tar.gz
2010-09-04 23:47	j-b-m	Status	new => acknowledged
2010-09-04 23:47	j-b-m	Category	Transitions => MLT
2010-09-04 23:57	j-b-m	File Added: composite.png
2010-09-04 23:57	j-b-m	File Added: affine.png
2010-09-04 23:58	j-b-m	Note Added: 0005775
2010-09-05 00:00	j-b-m	Note Edited: 0005775	View Revisions
2010-09-06 08:38	ddennedy	Note Added: 0005791
2010-09-06 08:38	ddennedy	Status	acknowledged => resolved
2010-09-06 08:38	ddennedy	Fixed in Version	=> Recent git
2010-09-06 08:38	ddennedy	Resolution	open => fixed
2010-09-06 08:38	ddennedy	Assigned To	=> ddennedy
2010-09-14 11:00	j-b-m	Fixed in Version	Recent git => 0.7.8
2010-09-14 23:01	j-b-m	Status	resolved => closed