Nested vegs and deinterlacing problem

ScorpioProd wrote on 9/21/2009, 11:57 PM

I think I discovered a bug with nested veg files.

My intended workflow for taking my XDCAM HD 60i and downconverting it to SD DVD 60i was to edit it in an HD project, then nest that project into a DV widescreen 60i project so I could apply the "match output aspect ratio" to the HD veg. Then in that project I could render directly to MPEG-2 or DV in Vegas Pro 9 or frameserve out to TMPGEnc. Both projects had "blend" set for the deinterlacer in project properties, since Vegas needs a deinterlacer set to separate, scale and then reinterlace the fields.

But upon testing this I discovered that my MPEG-2 rendered from Vegas or via the frameserver through TMPGEnc and even the DV AVI I rendered all came out actual PROGRESSIVE.

I could not render out interlaced from my DV Widescreen interlaced project with the HD interlaced veg in it.

Luckily, I did figure out a workaround, that will now be my new workflow: I went back to the HD project and changed its properties to DV Widescreen AND checked the "Adjust source media to better match project or render settings." This worked out well.

I even tested nesting a single interlaced DV clip interlaced DV veg in another interlaced DV veg, and when I tried to render it out via the frameserver to TMPGEnc, it fed into TMPGEnc as progressive.

So at this point I'm wondering if nesting vegs can be used at all currently with interlaced projects.

Before I bug report it to SCS, have the rest of you seen this at all?

Thanks.

Comments

johnmeyer wrote on 9/22/2009, 9:08 AM

I ran into this back in January 2007. I provided an extremely detailed writeup directly to the Sony engineering staff and we sent quite a few emails back and forth. This was with Vegas 7.0d.

I created dozens of test cases with various combinations of upper field first and lower field first in the source projects, and then various combinations of changing the field order in the nested versions of those projects when they were dropped on the timeline in another project. I also varied the field order in the project properties of both the source project as well as in the master project, and also changed the field order in the final render.

It was a very large, and very confusing test matrix.

Bottom line is that I never found anything that worked. I either ended up with output that juddered from field reversal, or which was soft because somewhere along the way Vegas ended up throwing out the even or odd lines and then doing a line double.