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Old 22nd February 2012, 20:57   #1  |  Link
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Join Date: Dec 2007
Location: Germany
Posts: 634
Overlay and YV24

Hey guys,

I'm having a problem with Overlay when using YV24 color space.
Instead of a clean overlay without any transparency I get a half-opaque overlay and weird colors.
This behaviour only arises if the base clip is YV24, if it is in any other color space it works as expected, even with YV24 overlay clips.

I'm using 2.6, build Sep 13 2011 and SEt's MT.

Here's a script to recreate the problem:


b=Colorbars(pixel_type="YUY2", width=320, height=240).ConverttoYV24()

Overlay(last, b, x=160, y=32, opacity=1)

ConverttoRGB() #for viewing
Also, as a side note, generating the color bars in YV24 via pixel_type crashes on me without an error message.

Last edited by TheSkiller; 22nd February 2012 at 21:00.
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Old 22nd February 2012, 23:05   #2  |  Link
Avisynth Developer
Join Date: Jan 2003
Location: Melbourne, Australia
Posts: 3,173
Oops, Overlay does not ensure the input frame is writeable. Colorbars uses a single static frame, which of course is always in use, so the "frame->GetWritePtr(PLANAR_Y)" will return NULL.
196 	PVideoFrame __stdcall Overlay::GetFrame(int n, IScriptEnvironment *env) {
198 	FetchConditionals(env);
200 	// Fetch current frame and convert it.
201 	PVideoFrame frame = child->GetFrame(n, env);
202 	if (vi.IsYV24() && inputCS == vi.pixel_type) { // Fast path
203 	// This will be used to avoid two unneeded blits if input and output is yv24
204 	// Note however, that this will break, if for some reason AviSynth in the future
205 	// will choose different alignment on YV24 planes.
206 	if (img)
207 	delete img;
208 	img = new Image444(frame->GetWritePtr(PLANAR_Y), frame->GetWritePtr(PLANAR_U), frame->GetWritePtr(PLANAR_U),
209 	frame->GetRowSize(PLANAR_Y), frame->GetHeight(PLANAR_Y), frame->GetPitch(PLANAR_Y));
210 	} else { 
Fix scheduled.
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overlay yv24

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