YV12 FAQ

[esby]

I just tested with samples known to have problems with divx5.0X decoding.
No problem found, so it's prolly (my) vdub that uses divx5.0X to 'decode' Yv12, or vdub that assign divx5.0X name to yv12 f4cc.

esby

[hakko504]

DivX 5 is used for decoding any avs containing YV12. This have nothing to do with how AviSynth is decoding the video in the first place. This is just how the data is passed from AviSynth to VirtualDub. The actual AviSynth command (AviSource) will use the normally registered codec to decode the video, and you can also force AviSynth to use ffdshow by opening the video with DirectShowSource instead.

[Stux]

- Does 3ivx D4 codec support YV12 Video Stream? http://forum.doom9.org/showthread.p...76&pagenumber=3

3ivx D4 4.0.3 now correctly supports YV12 encoding

[wing1]

I've asked this question once before, please forgive me for asking it once again: I've noticed that in the YV12 'To Do' list there is no mention of this feature. Currently, this feature does function correctly in AVS2.5x; However, a 'converttoyuy2()' must preceed this function and a 'converttoyv12()' afterward. This would waste valuable CPU time and defeat the purpose of YV12. Is there plan to port this function to YV12 or it is not worth doing so?

[sh0dan]

Eventually it will be supported - the code is not that easy to understand, and there are several modes to support, so there has been more important things to work on up until now.

[wing1]

ahh..ok..not a problem

[Boulder]

Regarding Q11, the swapped channels have been corrected in DivX 5.0.3 so no need for SwapUV() if that's used as the decoder.

[abitfun]

I have already used AviSynth 2.5,and I find it very good.
I get faster encoding speed,at least it works on my PC,using the latest Nic-XviD.

The configuration of my PC:

Tulatin 1G(overclocked to 1.4G)
WD80GB-BB+U640GB
Jetway-615TCS
384MB SD-memory
Win2K-sp2-SCN/WIN2K-sp1-SCN

And I get a speed at 12~15fps at 1st-pass,12~15fps at 2nd-pass;
and I got very steady speed at 8fps before I use AviSynth 2.5.

THX to AviSynth 2.5!!!!!!

[crusty]

Since the subject of this thread has been altered to ÄviSynth 2.5 FAQ I think the next question has relevance and should be answered on top of this thread:

: What is multichannel support?

Just my $0.02

[Ty Bower]

I'm getting a curious error trying to get YV12 to work on my machine. Previously, I had software installed from the following kits:

GordianKnot RipPack 0.27
GordianKnow SystemPack 1.0

All worked well. I have since installed the software I believe I need for YV12:

AviSynth 2.51
MPEG2Dec3 v1.00
VirtualDubMod 1.4.13, build 310103
VirtualDubMod needed dlls, build 251102

I can drop my .avs script on WMP and it plays back just fine. Putting an "Info()" in my script confirms that my colorspace is indeed YV12. However, when I try to encode it in VirtualDubMod, I get the following error:

"VideoSourceAVI error: The source image format is not acceptable. (error code -2)"

If I put a ConvertToYUY2() in my script, it works fine. If I turn off fast recompress and use full processing mode, it also works fine. Unfortunately, both these options kinda defeat the purpose. My codec is DivX 5.0.2. Any ideas? My cropping and resizing values are all legit (even numbers for cropping, multiples of 16 for resizing).

[sh0dan]

What codec are you compresing to?

[Ty Bower]

I'm compressing to DivX 5.0.2. I've tried both the Pro version as well as the standard. It doesn't seem to matter whether I configure the encoder for single pass, multi-pass, or whatever.

I will admit it seems more like a problem with my DivX codec rather than an error coming from AviSynth, MPEG2Dec3, or VDubMod. It almost smells like my DivX codec isn't accepting YV12 input?

[sh0dan]

Open a new thread, or ask in the DivX forum - I don't know the solution of your problem.

[scmccarthy]

The DivX forum is one option, but finding out what error code -2 is might offer a valuble clue.

Stephen

[Acaila]

I believe error -2 comes up with a variety of things, I can't think of anything specific out of the top of my head that can trigger it. I would have said a resolution problem, but like you said, even cropping numbers and mod 16 are definately not the problem. Most likely your installation has gone bad (be sure that you install the codec AFTER you install GKnot). Reinstall the DivX codec and see if that clears it up.

But it's definately not an Avisynth problem.

[Ty Bower]

I re-installed the DivX codec, AviSynth, MPEG2Dec3.dll, and VirtualDubMod. I also tried DivX 5.0.3. Nothing seems to help.

I tried installing the same software on another machine. I got it working over there, so I guess there must be something flaky on the first PC? Maybe I can try re-installing the OS.

I took my question over to the DivX forum. Maybe someone has seen this before.

[Druizk]

@Ty bower

What happening?, How resolve your problem?...

My experience, I said...

First: Install the las betas or release and CVS Binary Files
Open VirtualDubMod with AviSynth file, in menu File /File Information you see "ForCC Code" and "Decompressor".

Second: Change file avisynth ConvertoYuy2(),ConvetToYv12() or both
Repit the first pass.

In both colorspace, you can see the Decompressor used in Windows.

Uninstall or re-install this Decompressor, someone video-board install yourself decompressor. I'm using for YV12 "ATI Yv12" and "Xvid MPEG-4".

[troy]

Sorry Im a newbe. so if I am converting dv material and frameserving to cce with avisynth do I need to make ConvertToYUY2 the last line of my script.

[Wilbert]

I guess your dv is YUY2. So if you don't convert to YV12 in your script, you don't need the line ConvertToYUY2. Note you can also put the filter info as the last line, to see what the color format is.

[Guest]

Please open new threads for problems. This thread is for the FAQ and comments related to that. Thank you.