Bug(?): ConvertToYV12 gives green frames on big input

mf · 25th March 2003, 19:58

Code:

# (source is RGB32)
PointResize(1440, 960)
ConvertToYV12()
PointResize(720, 480)

Gives this:

sh0dan · 25th March 2003, 19:59

.. under investigation...

mf · 25th March 2003, 20:07

Quote:

Originally posted by sh0dan
.. under investigation...

Wha that was quick

. As a note: I encountered the problem once before (also on big input, where I had to do a convert in the middle of a supersample chain), and now that I found the problem a second time I tested all other relevant filter combinations and isolated the problem to the script posted above. So I know it's not PointResize's fault, for instance

. Might save you some time testing. Thanks

.

Edit: I forgot something, which I just tested. If the source is YUY2 it doesn't happen.
Edit2: ConvertToYUY2 doesn't have the problem. Do they share code? If so, it's probably not the problem of that shared code

. Might save some time

.
Edit3: Since it doesn't happen on YUY2, does it hurt to do ConvertToYUY2.ConvertToYV12 (afaik only the subsampling is different between YUY2 and YV12, and when your source isn't subsampled, you have no problem, right)?

sh0dan · 25th March 2003, 20:28

The YV12 <-> RGB conversions are the ones from XviD, but due to differences there might be some differences. All conversions involving YUY2 are written specially for AviSynth.

sh0dan · 25th March 2003, 20:33

Confirmed - strange bug. Seems like there are distortions when h>512.

(Completely offtopic - are you interested in a zoomby2() funtion?)

mf · 25th March 2003, 20:47

Quote:

Originally posted by sh0dan
(Completely offtopic - are you interested in a zoomby2() funtion?)

I'd be more interested in a YUV colorspace that doesn't do chroma subsampling. Because Merge*ma() only eats YUV, I have to blow up the image to keep the chroma intact.

Bidoche · 25th March 2003, 20:47

I would say yes for zoomby2

sh0dan · 25th March 2003, 21:40

MASM assembler error - nice

Fixed in CVS.

When we got YV12 stable well have a look at a YUV 4:4:4 format

mf · 25th March 2003, 22:54

Quote:

Originally posted by sh0dan
MASM assembler error - nice

Fixed in CVS.

When we got YV12 stable well have a look at a YUV 4:4:4 format

Thanks alot

. Now I still have two problems left from the script that generated this error, which you can find in the AVISynth usage forum

.

sh0dan · 26th March 2003, 15:01

New binary put up.

25th March 2003, 19:58	#1 \| Link
mf · Join Date: Jan 2002 Posts: 1,729	Bug(?): ConvertToYV12 gives green frames on big input Code: # (source is RGB32) PointResize(1440, 960) ConvertToYV12() PointResize(720, 480) Gives this:

25th March 2003, 19:59	#2 \| Link
sh0dan Retired AviSynth Dev ;) Join Date: Nov 2001 Location: Dark Side of the Moon Posts: 3,480	.. under investigation... __________________ Regards, sh0dan // VoxPod

25th March 2003, 20:28	#4 \| Link
sh0dan Retired AviSynth Dev ;) Join Date: Nov 2001 Location: Dark Side of the Moon Posts: 3,480	The YV12 <-> RGB conversions are the ones from XviD, but due to differences there might be some differences. All conversions involving YUY2 are written specially for AviSynth. __________________ Regards, sh0dan // VoxPod

25th March 2003, 20:33	#5 \| Link
sh0dan Retired AviSynth Dev ;) Join Date: Nov 2001 Location: Dark Side of the Moon Posts: 3,480	Confirmed - strange bug. Seems like there are distortions when h>512. (Completely offtopic - are you interested in a zoomby2() funtion?) __________________ Regards, sh0dan // VoxPod Last edited by sh0dan; 25th March 2003 at 20:57.

25th March 2003, 21:40	#8 \| Link
sh0dan Retired AviSynth Dev ;) Join Date: Nov 2001 Location: Dark Side of the Moon Posts: 3,480	MASM assembler error - nice Fixed in CVS. When we got YV12 stable well have a look at a YUV 4:4:4 format __________________ Regards, sh0dan // VoxPod

25th March 2003, 20:47	#7 \| Link
Bidoche Avisynth 3.0 Developer Join Date: Jan 2002 Location: France Posts: 639	I would say yes for zoomby2

26th March 2003, 15:01	#10 \| Link
sh0dan Retired AviSynth Dev ;) Join Date: Nov 2001 Location: Dark Side of the Moon Posts: 3,480	New binary put up. __________________ Regards, sh0dan // VoxPod