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Bug 611749 - Poor quality when mixing PNG files with alpha channels
Poor quality when mixing PNG files with alpha channels
Status: RESOLVED FIXED
Product: pitivi
Classification: Other
Component: General
Git
Other Linux
: Normal normal
: 0.91
Assigned To: Pitivi maintainers
Pitivi maintainers
Depends on:
Blocks:
 
 
Reported: 2010-03-03 23:08 UTC by Brandon Lewis
Modified: 2013-10-30 17:36 UTC
See Also:
GNOME target: ---
GNOME version: ---

Attachments
What you'd expect to see (221.24 KB, image/png)
2010-03-03 23:09 UTC, Brandon Lewis 		Details
What you get (251.92 KB, image/png)
2010-03-03 23:10 UTC, Brandon Lewis 		Details
Transparent PNG file exhibiting problem (2.75 KB, image/png)
2010-03-03 23:11 UTC, Brandon Lewis 		Details
project which renders as expected (4.15 KB, text/x-xptv)
2010-03-03 23:23 UTC, Brandon Lewis 		Details
new project using exact same clips which shows bug (7.58 KB, text/x-xptv)
2010-03-03 23:24 UTC, Brandon Lewis 		Details

Description Brandon Lewis 2010-03-03 23:08:40 UTC 
One use case for transparent images in the timeline is title keys. These seem to be rendering with poor quality in current git master. See attached screenshot.
Comment 1 Brandon Lewis 2010-03-03 23:09:42 UTC 
Created attachment 155172 [details]
What you'd expect to see
Comment 2 Brandon Lewis 2010-03-03 23:10:21 UTC 
Created attachment 155173 [details]
What you get
Comment 3 Brandon Lewis 2010-03-03 23:11:12 UTC 
Created attachment 155174 [details]
Transparent PNG file exhibiting problem
Comment 4 Brandon Lewis 2010-03-03 23:22:39 UTC 
source file used in this video: 
http://triplehelix.org/~dotsony/small-mvi_0008.avi
Comment 5 Brandon Lewis 2010-03-03 23:23:38 UTC 
Created attachment 155176 [details]
project which renders as expected
Comment 6 Brandon Lewis 2010-03-03 23:24:23 UTC 
Created attachment 155177 [details]
new project using exact same clips which shows bug
Comment 7 Petri Ihatsu 2010-05-12 15:32:57 UTC 
I can confirm this behaviour. I was layering an alpha-png with a video clip and the rendered video always contains a black frame around it. Exactly as Brandons example shows. When the png is the only source in the timeline, the image size is as it should; But when the video clip kicks in, the png image is suddenly resized so that there will be a black border around it. I could not find a workaround.
Comment 8 Jean-François Fortin Tam 2013-10-04 22:59:12 UTC 
This one's for Mathieu as part of his videomixer fixes now...
Comment 9 Jean-François Fortin Tam 2013-10-30 17:36:07 UTC 
Actually this is fixed, from testing with the PNG provided above.