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Field Order changed during processing

 
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Andrisim



Joined: 08 May 2011
Posts: 5

PostPosted: Sun Jan 29, 2012 8:21 am    Post subject: Field Order changed during processing Reply with quote

With respect to Field Order - NV/VirtualDub

I have found that if I start with a SD avi clip having Field Order = Upper, the processed clip has Field Order = Lower.

Whereas, when I repeated the test with a SD avi clip having Field Order = Lower, after processing it was still at Lower.

Am I to conclude that NV always wants to "see"" SD avi clips having Field Order = Lower?

FYI : Codec is Canopus HQ @ 720x576 50i or 720x480 59.94i, not DV.
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NVTeam



Joined: 01 Sep 2005
Posts: 1740

PostPosted: Sun Jan 29, 2012 11:57 pm    Post subject: Re: Field Order changed during processing Reply with quote

Andrisim wrote:
Am I to conclude that NV always wants to "see"" SD avi clips having Field Order = Lower?

No, NV does not require any specific order and does not change the order when processing the video stream. Any change of the order that you observe is applied in another part of the decoding/rendering/encoding dataflow, not in/by NV.

Vlad
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Andrisim



Joined: 08 May 2011
Posts: 5

PostPosted: Mon Jan 30, 2012 6:57 am    Post subject: Reply with quote

Just to make sure :

My editor is Canopus Edius 6 and the avi is exported as Canopus HQ codec 720x480 50i Upper Field. NV processes it in VirtualDub.

When I raised this matter on the Canopus Forum, the reply from a senior contributor was as follows:

Canopus HQ does not provide field order info to other programs, so other programs need to guess and Neat Video guesses wrong

so when you put the Neat video file back in EDIUS, it will flicker, so go to clip properties and change it to upper and it will be fine


Based on what you say, if NV is not doing it could it be VirtualDub?
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NVTeam



Joined: 01 Sep 2005
Posts: 1740

PostPosted: Mon Jan 30, 2012 10:30 am    Post subject: Reply with quote

Could be. Try to process the original file using VirtualDub without NV (perhaps with some other filter from VirtualDub itself), and ensure the output is correctly encoded.

Vlad
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Andrisim



Joined: 08 May 2011
Posts: 5

PostPosted: Mon Jan 30, 2012 12:17 pm    Post subject: Reply with quote

I just ran a test using VirtualDub VHS Filter.
The original Upper Field avi after processing shows as Lower Field when put back on the Timeline.
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NVTeam



Joined: 01 Sep 2005
Posts: 1740

PostPosted: Mon Jan 30, 2012 1:37 pm    Post subject: Reply with quote

Must be VD then, or the codec it uses to encode the output. Try to adjust the codec settings. Also check the VD documentation or ask VD developer for additional details.

Vlad
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