Interlace Flicker II

rabsamir wrote on 3/27/2012, 5:22 AM

Following some advice on this forum (Topic "Jerky small details") I rendered a file which showed some flicker in the vertical and horizontal lines in the DVD version using another format: "Internet HD 1080p" I played the scene.mp4 to my TV via a Media Player and Presto! no noticeable flicker!
I also cannot notice any degradation of the image (if I don't notice it isn't there, for all what matters :-)

I understand that I cannot make a DVD or BR this way. The DVD version was not satisfactory and I don't own a BR burne/player to make a test. Would this make a difference?

The original clip is PAL interlaced, not progressive, so I thought something could go wrong, rendering i to p.

As you already know, I'm pretty new to these things, any comment would be appreciated :-)

Jorge

Comments

farss wrote on 3/27/2012, 5:30 AM

Which De-Interlace method was selected in your project properties?

Bob.

rabsamir wrote on 3/27/2012, 5:56 AM

Hi Bob

Blend Fields as always I presume. I didn't change anything there.

The project template is HD 1080-50i (25 fps)

John_Cline wrote on 3/27/2012, 6:12 AM

By going from interlaced to progressive, you have effectively cut your temporal resolution in half from 50 individual images (fields) per second to 25 images per second, this will make any quick pans "judder." If you do choose to convert from interlace to progressive and there is any motion in the footage, using the "interpolate" deinterlace method would be a better choice than "blend."

farss wrote on 3/27/2012, 6:33 AM

"If you do choose to convert from interlace to progressive and there is any motion in the footage, using the "interpolate" deinterlace method would be a better choice than "blend." "

Possibly out of the frying pan into the fire though, then he looses half the vertical resolution. Best solution would be to use the free YADIF OFX de-interlacer plugin which seems to avoid ending up with too much judder because it in effect adds a bit of motion blur.

Unfortunately the real problem seems quite difficult, the camera has issues with aliasing that aren't an issue in progressive but are in interlaced.

Bob.

[edit] If the intention is to produce a good looking SD DVD then interpolate would be a better choice, just render to the DVD Architect PAL Widescreen video stream under MPEG-2.

rabsamir wrote on 3/27/2012, 6:46 AM

Judder:

Aw! I noticed but attributed that to the OIS :-(

I see...

Arthur.S wrote on 3/27/2012, 6:46 AM

Yes, I've also found interlaced footage that looks fine in it's original HDV state, looks shocking when down converted for DVD - whatever method I've tried in Vegas. I'm mainly talking about brickwork etc here. Normal shots are OK. My solution, which I found out of desperation really, was to use TMPGEnc to do the encode to a Progressive DVD. The difference is remarkable.

dxdy wrote on 3/27/2012, 7:03 AM

+1 for TMPGEnc. Really quite remarkable results for AVCHD to DVD MPG2.

Fred

amendegw wrote on 3/27/2012, 7:11 AM

Jorge,

Here's an interesting read: Aliasing, artifacts and moire? (be prepared for some mental exhaustion [grin]).

I'm one of the few proponents of adding "Reduce Interlace Flicker" to reduce the problems you are seeing. Others say I'm full of #$@% (I can accept that). If you read thru the reference clip, Nick Hope (whose opinion I very much respect), has demonstrated the RIF merely introduces a "blend deinterlace" (the 4/28/2011 8:21:13 AM post).

So, as has been said many times before, YMMV

...Jerry

rabsamir wrote on 3/27/2012, 10:31 AM

Thanks Jerry I'll read it with my two remaining brain cells :-)

OT
BTW for dog lovers I posted a short clip to my Dog in his 6.birthday

Joarge

amendegw wrote on 3/27/2012, 12:19 PM

Jazzy loves the dog videos and says, "Herzlichen Glückwunsch zum Geburtstag"

...Jerry

MTuggy wrote on 3/27/2012, 1:56 PM

Do you know what TMGPEncoder does with the HD footage to get better looking DVD quality video from HD footage? Seems we should be able to replicate that within Vegas to optimize the downgrading of HD to DVD without having to add another piece of software to the process.

I too have seen some less than desirable outcomes when converting an HD project to DVD quality output. Love to know what others have tried within Vegas to keep DVD output looking as sharp as possible.

Mike

rabsamir wrote on 3/29/2012, 2:33 AM

@jazzy

Danke, Jazzy! We thought that nobody else spoke German, what a surprise!

Dein

Samir :)