Playback of Interlaced files on Vegas

Former user wrote on 1/6/2023, 8:39 AM

If you playback the following file in Vegas, you'll see a Vegas V for 1/2 a second, and then you won't see it again, however it never went away you just can't see it on Vegas. This is how it looks in a media player, but it could look different depending on how the media player deinterlaces

A blended V. In Resolve it is different again, because each field is displayed correctly, alternating between V and no V.

My Questions, why do I not see a flashing or blended V in Vegas except for the first 18frames or so, why does the V go away?

The V (I think) is on the top field, does this mean Vegas doesn't read the top field, and isn't that a problem, because it's going to be there in the finished render, and instead of a V it's might be some sort of interference or corruption instead, but it can't be seen while editing?

https://www.dropbox.com/s/onl3bfo6gpbftj9/colorbars-V.mxf?dl=0

 

 

Comments

andyrpsmith wrote on 1/6/2023, 10:18 AM

I get a V which goes away on Best full and a V that stays on anything other than best full.

(Intel 3rd gen i5@4.1GHz, 32GB RAM, SSD, 1080Ti GPU, Windows 10) Not now used with Vegas.

13th gen i913900K - water cooled, 96GB RAM, 4TB M2 drive, 4TB games SSD, 2TB video SSD, GPU RTX 4080 Super, Windows 11 pro

Former user wrote on 1/6/2023, 5:06 PM

@andyrpsmith Thanks for testing 👍

Yes, I was playing in Best/Full

In Best/Half I get the same as you

So even more confused now. Does anyone know why the the blended V show throughout the video in any Preview setting other than BEST/FULL . This is a better representation of the exported file, but still not perfect as far as editing, as a flashing V is what's actually there.

I have tried a number of things to see the Flashing V including changing playback to 59.94fps and trying different de-interlace options

Former user wrote on 1/7/2023, 8:01 AM

I had an idea. Is it possible there's a form of error correction with de interlacing, and BEST/FULL is really the the best quality, it see's the V is only on one field, it understands this can't possibly be correct for conventional recorded interlaced video so filters it out after about 1/2 a second, but the lesser previews don't have this ability?

Does that sound ridiculous?

All the old de interlacing guru's from years past have left for greener pastures?

 

Vincent-Brice wrote on 1/7/2023, 9:37 AM

I get it disappear after the 18th frame on all the full previews but also on all the draft and preview previews, whether full, half or quarter. But it stays on for the Best and Good Halves and quarters. On the previews where it stays on, at the 18th frame the V is bright and crisp. Does that shed light on anything?

Last changed by Vincent-Brice on 1/7/2023, 9:48 AM, changed a total of 1 times.

Gigabyte Aorus Pro V2 motherboard, AMD Ryzen 9 5950X, Gigabyte AMD RX 6800XT, 64GB Corsair Vengeance 3600MHz ("Ryzen tuned", whatever that is), 500GB Corsair Force MP600 Gen 4 M.2 C:drive for windows and programs, 500GB Samsung Sata SSD EVO D:drive for video files, 1TB Samsung Sata SSD EVO E:drive for all other data, Gigabyte Aorus Waterforce 360 CPU cooler, Thermaltake Core P5 TG open case, Contour ShuttleXpress.

Windows 11 Pro 24H2, Vegas Pro 22 (Build 250)

Former user wrote on 1/10/2023, 8:18 PM

@Vincent-Brice It's as crisp and full resolution as the V's seen on Resolve. I don't understand it either, I also found a media player that does the identical thing. It seems it's just difficult to get expert info about interlaced video these days