Can't read an odd-resolution WMV properly

yukichigai · 21st February 2007, 12:24

I'm having some difficulty with a WMV clip I'm trying to load up in AviSynth. It's encoded using WMVA and has a width of 426 (not divisible by four), but the WMVA decoder forces it to output in YV12, which causes serious problems. Even if I do a color conversion I get a "diagonally slanted" video. I've been trying to figure out a way to force it to load the clip in a different colorspace, but because I'm stuck using DirectShowSource I can't. What are my options?

krisq · 21st February 2007, 12:38

428/4=107

yukichigai · 21st February 2007, 12:42

Quote:

Originally Posted by krisq

428/4=107

Sorry, I meant 426

yukichigai · 21st February 2007, 13:28

Attached are two images showing what I get when trying to render the file in AviSynth and what I get when just playing the file in MPC. The "diagonal distortion" output happens regardless of if I crop/don't crop, convert to whatever color space, etc.

IanB · 22nd February 2007, 04:19

Code:

DirectShowSource(..., pixel_type="...") # 2.5.7 Feature

Try YUY2 and RGB

yukichigai · 22nd February 2007, 04:35

Quote:

Originally Posted by IanB

Code:

DirectShowSource(..., pixel_type="...") # 2.5.7 Feature

Try YUY2 and RGB

Damn, I didn't know 2.5.7 was out. Thanks, that did the job nicely!

IanB · 22nd February 2007, 04:56

Okay, DSS currently assumes YV12 rows are mod 4 aligned in memory like BMP's are.

Looks like either this assumption is wrong.

Can you upload a small sample (<10 frames) of this file for testing.

21st February 2007, 12:24	#1 \| Link
yukichigai Registered User Join Date: Jun 2004 Posts: 47	Can't read an odd-resolution WMV properly I'm having some difficulty with a WMV clip I'm trying to load up in AviSynth. It's encoded using WMVA and has a width of 426 (not divisible by four), but the WMVA decoder forces it to output in YV12, which causes serious problems. Even if I do a color conversion I get a "diagonally slanted" video. I've been trying to figure out a way to force it to load the clip in a different colorspace, but because I'm stuck using DirectShowSource I can't. What are my options? Last edited by yukichigai; 21st February 2007 at 12:42.

21st February 2007, 12:38	#2 \| Link
krisq Registered User Join Date: Dec 2003 Location: Poland Posts: 171	428/4=107 __________________ (!sig)

21st February 2007, 13:28	#4 \| Link
yukichigai Registered User Join Date: Jun 2004 Posts: 47	Just so you get an idea of what I'm talking about Attached are two images showing what I get when trying to render the file in AviSynth and what I get when just playing the file in MPC. The "diagonal distortion" output happens regardless of if I crop/don't crop, convert to whatever color space, etc. Attached Images

22nd February 2007, 04:19	#5 \| Link
IanB Avisynth Developer Join Date: Jan 2003 Location: Melbourne, Australia Posts: 3,167	Code: DirectShowSource(..., pixel_type="...") # 2.5.7 Feature Try YUY2 and RGB

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22nd February 2007, 04:56	#7 \| Link
IanB Avisynth Developer Join Date: Jan 2003 Location: Melbourne, Australia Posts: 3,167	Okay, DSS currently assumes YV12 rows are mod 4 aligned in memory like BMP's are. Looks like either this assumption is wrong. Can you upload a small sample (<10 frames) of this file for testing.