[CinCV] [Bug 470] New: Fading in and out a .PNG in one track causes a ZEROED track to be brifley seen

[bugzilla-daemon]

http://bugs.cinelerra.org/show_bug.cgi?id=470

           Summary: Fading in and out a .PNG in one track causes a ZEROED
                    track to be brifley seen
           Product: Cinelerra
           Version: 2.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Medium
         Component: Effects/Transitions
        AssignedTo: cinelerra@skolelinux.no
        ReportedBy: [EMAIL PROTECTED]


When there are two video tracks in wich the bottom one (track 1) is a video
file with the fader at ZERO, and the top one (track 2) is a still PNG image
with a black background, using keyframes to fade in and out of that PNG image
causes track 1 to be briefly seen, although the fader is at ZERO.

Reproducible: Always

Steps to Reproduce:
1. Create a project with two video tracks. Colorspace must be RGBA or YUVA.
2. Track 1 is at the bottom. Track 2 is at the top.
3. Add a video file to track 1. Set track 1 fader to ZERO.
4. Add a .PNG image to track 2. The image must have a non-transparent
background, like black or gray.
5. Use keyframes to create a fade in and fade out with track 2.
6. Play the result.

Actual Results:  
You should briefly see the contents of track 1.

Expected Results:  
You should not be able to see those contents.

This does not happen in colorspace RGB or YUV.


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