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Bgra Vs Rgba Vs Bgr32 Vs Bgr24 Vs...
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Bonta
  Posted: Dec 7 2010, 03:25 AM


Newbie


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Member No.: 19848
Joined: 19-September 06



I want to report two bugs with VirtualDub.

1. If I play back an AVI that uses the HUFFYUV (or the motion PNG) codec and has the pixel format in BGRA, VirtualDub will play it fine but when it is finished and pauses on the last frame, the R and B channels get swapped suddenly. If I use the slider to seek back and forth, every frame I go to has R and B swapped. (Windows Media Player and Media Player Classic werk fine). (*)

2. If I start with an AVI that is BGR24, and I select a color depth of 32 bit (dummy alpha channel) I get... a random Alpha channel. Please set the new Alpha channel to opaque (255 in 8 bit int speak). OK, so its more of a feature request.

Please distinguish between BGR24, BGR32 and BGRA. Oh, and RGB24, RGB32 and RGBA as well. smile.gif

Thanks for your excellent work on VirtualDub.

(*) I use the codec pack ffdshow http://sourceforge.net/projects/ffdshow-tryout/ and I go into the VFW config dialog it has to enable a bunch more codecs for VirtualDub.
 
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phaeron
Posted: Dec 12 2010, 11:52 PM


Virtualdub Developer


Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02



Do you see the same R/B swapping behavior with the internal Huffyuv codec (check "prefer internal video codecs" in Options > Preferences > AVI)?

As for the alpha channel: why are you compressing as BGRA if the alpha channel is going to be opaque anyway...?
 
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