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Rendering Ruins My Interlace
I have footage (originated on Varicam, captured 1080i50) that I need to interlace for a specific look.
For this I am testing both re:Vision’s Fieldskit ReInterlacer and Graeme Nattress’ G Reinterlacer – both do as expected and generate interlaced images.
However once I render these effect the interlacing is gone.
If, I apply either of the effects to a clip and park the playhead over that clip I see distinct fields when looking at a 100% frame in the Canvas, and when I disable the ‘avoid jitter’ option from my Decklink, I get interlace video out the HD-SDI also.
However, when I render that effect at the end I no longer see distinct fields in the Canvas, and I don’t get the field jitter I expect of a stopped frame. Instead I see what looks like blended fields, which is not what I want.
The clips are all ProRes 422 HQ at 25fps, upper field dominant. The sequence is also ProRes 422 HQ, upper field dominant, and in the Advanced Settings for the codec, Interlaced is ticked.
Why is the render ruining my interlacing?
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10 Replies
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[Dylan Reeve] “I have footage (originated on Varicam, captured 1080i50) that I need to interlace for a specific look. “
If you already have interlaced footage (1080i 50), what you want to interlace?[Dylan Reeve] “For this I am testing both re:Vision’s Fieldskit ReInterlacer and Graeme Nattress’ G Reinterlacer – both do as expected and generate interlaced images. “
Those filters works in progressive footage that need to be interlaced.Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
[Rafael Amador] “If you already have interlaced footage (1080i 50), what you want to interlace?”
It has originated on Varicam (at 720p25) but it played back from the deck as 1080i50. It is essentially 1080PsF25.
[Rafael Amador] “Those filters works in progressive footage that need to be interlaced.”
It is indeed progressive (although contained in an interlaced format). The plugins, before I render them, do as I expect and create what appears to be two distinct fields.
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OK. So the problem may be that even those clips are “visually progressive” they are interpreted and they behave as interlaced.
Is possible that the “re-interlacers” don’t know what to do with some clips that supposed to be already interlaced.
I would try like that:
– In the browser, check the clips as progressive.
– Drop them in a “upper-first” sequence.
– Apply the re-interlacer (Nattress or ReelSmart).
– In the effect check the output field order “upper first”.
Should works.Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
[Rafael Amador] “OK. So the problem may be that even those clips are “visually progressive” they are interpreted and they behave as interlaced.
Is possible that the “re-interlacers” don’t know what to do with some clips that supposed to be already interlaced.
I would try like that:
– In the browser, check the clips as progressive.
– Drop them in a “upper-first” sequence.
– Apply the re-interlacer (Nattress or ReelSmart).
– In the effect check the output field order “upper first”.
Should works.”Yup.
There is no ‘Progressive’ option in the Clip’s Properties, but I can change the field dominance to ‘None’ which I figure is about the best I can do.
Other than that, I created a new sequence with Upper-Field, using ProRes 422 (with Interlaced and Upper field set in Advanced).
Still no luck, exactly the same result – I see two fields in Canvas and out DeckLink before I render, but afterward there are no fields.
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[Dylan Reeve] “There is no ‘Progressive’ option in the Clip’s Properties, but I can change the field dominance to ‘None’ which I figure is about the best I can do.”
Yes this is what I meant. Change the field dominance of the clips in the browser column.Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
Yup, did that. No luck.
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I’ve just reintalled the FieldsKit. I’ll make a test.
Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
Hi Dylan,
I’ve been making a test with 720p25 and 720p50 from the EX-1. In a ProRes upper first sequence.
I dropped the FieldsKit Re-interlacer and the result at the moment is disappointing.
As you said in the screen I could see the interlacing before rendering. After rendering no interlacing.
Any way I will have a look in Shake to see if there is or not interlacing.Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
Hi Dylan,
i made again a test with the FieldsKit Reinterlacer on 720p25 footage. This time worked OK.
Yesterday I tried two optopns that I shouldn’t had (didn’t read the manual).
I tried with “frame blending” and was OK. Motion estimated, didn’t look so good (may be to much movement in the pictures I used) but did it.
I told you to check the footage as “NONE” in the browser column. You told me you did it, but one question: Did you changed the field oder to NONE once the clips were already in the time-line? If so, that do not works. Th changes to the clips settings do not affect to the footage that have been set already in the sequence. You have to change it and drug the clip again.Mac OX 10.5.2-FC 6.02-QT 7.4.1
G5 2x2Gh 4GbRAM-BlackMagic Extreme
PMBP 17″Core2Duo 4GbRAM-AJA ioHD
JVC DTV-17″
SONY EX-1 . SONY PD170
..and always a big mess on top of the table. -
I changed the clips, created a new sequence and then dropped them (actually it, I was testing with a single clip) in there and tested.
Whatever is happening for me doesn’t seem to be related to the plugin, which is doing as I expect, but is something about the rendering, as both the interlacers I’m testing with do the same thing upon rendering.
I may have another crack at it on Monday.
Unfortunately a large part of this series is a ‘show within a show’ that needs to have a ‘videoy’ look (interlaced, and possible sharpened a little).
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