Comment 8 for bug 507872
Revision history for this message
| Andy Finch (fincha) wrote Re: [Openshot.developers] [Bug 507872] Re: Ken Burns effect is choppy | #8 |
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0e1f616
(Get the code!)
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 address hidden> 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/
> 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:/
> 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.
>
>
>
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