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| Bill_G |
| Posted: Nov 19 2009, 01:21 PM |
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Newbie
Group: Members
Posts: 4
Member No.: 26484
Joined: 19-November 09
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Hi everyone.
I have Virtualdub 1.9.7 and have a similar problem as TCmullet has with the IVTC-filter.
Every 5th frame in the source-file is a duplicate to it's previous frame.
I just want to delete those duplicate frames and if I click "Reduce frame rate" in the IVTC-filter it actually does what I want but the remaining frame of the two identical ones is interlaced.
Isn't there a simple way of just turning of the recombining of the 2 frames that is intended I suppose for source-files that are interlaced from start.
Also it would be great to be able to do this with "direct stream copy" if possible since it's allready correcting the framrate leaves the audio-stream unchanged. I mean if you delete frames that are in fact identical, it should'nt cause any artefacts even if there are no keyframes nearby.
As it is now I can see a perfect result in the input (left) pane when I move forward through the video with right-arrow but in the output (right) pane I see every 4th frame interlaced.
And it's a bit irritating to see exactly what you want in the input pane and not being able to get it to the output 
Otherwise I love Virtualdub and have been using it for years 
Thanks for any tip.
/ Bill
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| Bill_G |
| Posted: Nov 19 2009, 02:10 PM |
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Newbie
Group: Members
Posts: 4
Member No.: 26484
Joined: 19-November 09
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Here are some clips that I tested with for those who are interrested.
http://www.billshemsida.com/ivtc/
/ Bill |
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| phaeron |
| Posted: Nov 20 2009, 05:06 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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The IVTC filter currently doesn't support this form of telecine pattern, I'm afraid. |
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| jpsdr |
| Posted: Nov 20 2009, 08:42 AM |
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Advanced Member
Group: Members
Posts: 335
Member No.: 20490
Joined: 23-December 06
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Hello.
Try my IVTC filter, you can get my filters here : http://dl.free.fr/u0adFigzO
You have to use in this order :
IVTC filter v4.4.0 (leave parameters by default)
Remove frame v1.0.0 (leave parameters by default)
If IVTC realy doesn't seem to work, try checking 'Invert polarity'.
Also, if you can provide my a sample of around 50-100 frames, with very good
telecine effect visible, i can also test it.
Edit : Didn't see the link, i've take a look.
Ok, very simple : just use my remove frame filter, change only the offset to 4. |
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| Bill_G |
| Posted: Nov 20 2009, 02:42 PM |
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Newbie
Group: Members
Posts: 4
Member No.: 26484
Joined: 19-November 09
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Thanks jpsdr
Thats exactly what I needed.
And then just set the frame rate to 23.976 fps.
Problem solved.
cheers
/ Bill
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| jpsdr |
| Posted: Nov 20 2009, 05:04 PM |
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Advanced Member
Group: Members
Posts: 335
Member No.: 20490
Joined: 23-December 06
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There is something strange...
In your video, the last frame is duplicated by pack of 5.
Wich mean, in the sequence, you have (4,5) (9,0) identical.
Theoricaly, with an IVTC manual set to an offset of 4, this should work...
The filter should re-construct frame using frames 4 and 5,
constructing new frame using top from 4 and bottom from 5 (or
B4 T5...). But it didn't... That's very odd !!
Phaeron : Is it normal ?? Or is there something that i've not understood ?
Ok, I think there is a problem with IVTC filter !
I've just tested the file on an old VDub version (1.5.4), set ivtc to manual
offset of 4, invert polarity not checked : Result was fine (as expected).
Tested with 1.9.7, both TFF or BFF, neither worked.
Are-you sure in manual IVTC you've not swapped T/B field,
as between old filter where pointer was on the bottom off the
frame, now with new API pointer is at the top of the frame ?
Or, maybe it's something else...
Note :
My filter is better beacause faster, it didn't process anything on video, only drop frame. |
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| phaeron |
| Posted: Nov 21 2009, 05:11 AM |
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Virtualdub Developer
Group: Administrator
Posts: 7773
Member No.: 61
Joined: 30-July 02
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It's not so much a problem with the IVTC filter as that it's being used for something that it isn't intended for. The built-in IVTC filter is intended for a regular 3:2:3:2 pattern; there are multiple ways to do reconstruction due to the duplicated fields and it just happens that the way it currently chooses isn't valid for a repeated frame pattern.
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| Bill_G |
| Posted: Nov 21 2009, 11:02 AM |
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Newbie
Group: Members
Posts: 4
Member No.: 26484
Joined: 19-November 09
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Let me see if I got this right:
1 2 3 4=5 6 7 - Input-file with frame 4 and 5 duplicated
1 2 3 4 5+6 6 - This is output after IVTC with reduce frame rate (I checked this)
1 2 3 4+5 5 6 - This is how jpsdr thinks it should be, and how the old version did.
Am I right?
It appears to me that jpsdr is right but then again as phaeron says it's intended for another kind of input-file that I don't now much of.
Anyhow I just asked because it seemed to be an easy thing to fix since the IVTC filter is allready removing one of the duplicate but in addition to that is making a combined reconstruction. Perhaps to skip the reconstruction part by unchecking the "field order" section.
But now I'm happy anyway.
Thanks again jpsdr.
/ Bill |
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