Hi Jonathan, Is there any documentation on the built-in MLT filters? Or even a list of what's available?
Cheers, Andy. On 9 June 2010 06:30, Jonathan Thomas <[email protected]> wrote: > Dan has located the bug in MLT, and here is his response: > ------------------ > I located the source of this problem - line 564 of > src/modules/core/transition_composite.c: > width_src -= 2; > > This is within a code block with the comment: > // Align chroma of source and destination > > Basically, the compositor is doing non-interpolated compositing in > packed YUYV 4:2:2 image format. This is a legacy choice based on the > requirements of the original contract under which mlt was developed > (realtime non-animated compositing for a 4:2:2 SDI output device in > 2004). > > Essentially, this means chroma has half the resolution of the luma > channel and when blending I must keep the chroma channels aligned - > can not blend U with V. So, there are constraints put into place to > adhere to these rules. If I remove the width_src line above, I resolve > the issue for this example, but other tests show an artifact. In the > attached image, there is an additional column on the right-hand side > that goes away when I retain this line. > > The only real resolution is to overhaul the composite transition as I > recently did for the affine transition. I plan to do that by the end > of the year. In the meantime, you might be able to use affine > filter/transition for some of your effects - it too takes a > keyframable geometry property, but its behavior is somewhat different. > > -- > Ken Burns effect is choppy > https://bugs.launchpad.net/bugs/507872 > You received this bug notification because you are a member of OpenShot > Developers, which is subscribed to OpenShot Video Editor. > > Status in OpenShot Video Editor: New > > Bug description: > This example video has two Ken Burns effects, one zooming to 200,200,-50,50 > and the other to 120,120,-10,-30. > > Any idea why the picture is jumping around so bad? Video was exported to > DVD-NTSC. > > > > _______________________________________________ > Mailing list: > https://launchpad.net/~openshot.developers<https://launchpad.net/%7Eopenshot.developers> > Post to : [email protected] > Unsubscribe : > https://launchpad.net/~openshot.developers<https://launchpad.net/%7Eopenshot.developers> > More help : https://help.launchpad.net/ListHelp >
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