FORUMS: list search recent posts

Tips for Reducing WMV moire?

COW Forums : Compression Techniques

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Brandon Adams
Tips for Reducing WMV moire?
on Jul 16, 2010 at 7:18:11 pm

A client needs a video delivered in WMV for PPT. The subject's shirt is producing moire in the WMV file at all resolutions I attempt. However, at the same resolution, an H264 MOV is not.
http://dl.dropbox.com/u/2056709/moire.png

Does anyone have tips I can try? (Using Flip4Mac)

-Brandon


Return to posts index

Chris Blair
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:19:41 pm

Are you using the same data rates? What version of WMV are you using? Version 8.0 used to do that but version 9 is a pretty good codec. It's just a variant of the VC-1 codec that's used for a lot of Blu-Ray DVD compression.

If you use WMV 9 advanced profile, you should be able to get output that compares favorably to H264. If not, try upping the data rate 20% or so on the WMV.

Some other questions:

1. Are all your encoding parameters the same, meaning are you deinterlacing, filtering, frame rates the same etc.

2. What are you using to encode your WMV...what application?

3. What are you playing them back on? Some media players aren't real fond of certain formats/codecs. For instance, a media file will often look completely different in VLC than it does in Quicktime or Windows Media Player or RealPlayer.

Let us know.



Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


Return to posts index

Brandon Adams
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:26:28 pm

Thanks Chris.

I gave it a shot with Standard and Advanced profile, as well as a variety of data rates. All settings are the same. Exporting from FCP via Quicktime Conversion to WMV using Flip4Mac. Using Quicktime via Flip4Mac to play back, but I get the same thing in VLC and MPEG Streamclip.

I'll have to chat with the Flip4Mac people and see if they have any input.

I had to deliver today, so I "resolved" it by doing 2 layers in FCP with one layer being a soft focus filter below the neck. Worked out fine at the 640x360 resolution they needed.

-Brandon


Return to posts index


Daniel Low
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:22:57 pm

Check your deinterlacing settings.

__________________________________________________________________
Sent from my iPad Nano.


Return to posts index

Brandon Adams
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:27:43 pm

Input type: Progressive
Output type: Progressive

-Brandon


Return to posts index

Daniel Low
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:41:03 pm

I'll repeat, check that you are not applying any deinterlacing filets or frame controls.

__________________________________________________________________
Sent from my iPad Nano.


Return to posts index


Brandon Adams
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:46:54 pm

? Am I missing something? I just said the export settings are set to progressive for input and output. There are no other settings relevant to deinterlacing in the Flip4Mac export options.

-Brandon


Return to posts index

Daniel Low
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:52:38 pm

I don't use f4m or compressor anymore but the most common cause for Moire is applying a deinterlace step to progressive material.

__________________________________________________________________
Sent from my iPad Nano.


Return to posts index

Brandon Adams
Re: Tips for Reducing WMV moire?
on Jul 16, 2010 at 10:53:41 pm

Ok, thanks Daniel. I'll see if I can find anywhere in the chain that might be occurring

-Brandon


Return to posts index


Chris Blair
Re: Tips for Reducing WMV moire?
on Jul 17, 2010 at 1:05:05 am

I'll second that on double checking the deinterlacing. That's why I asked about it in my first reply. WMV isn't as good or as efficient a codec as H264, but there shouldn't be that big a difference, especially at data rates above say 1200-1500Kb/sec.

Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com
Read our blog http://www.videomi.com/blog


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]