DS FRAW import scaling incorrect

Legacy Software mocha
#1

Hi,

38 frame PAL clip. (So, on DS, 37 frames active)
Import Fraws.

Each keyframe is progressively later than the previous by a fraction of a frame, so that by the end of the clip the keyframes are almost exactly 1.5 frames late. There are the correct number of keyframes, they’re just spaced slightly too far apart. It’s reasonably easily corrected, but it’s nevertheless wrong. I can’t imagine what I could be doing wrong, so I assume it’s a Mocha bug.

Also, the FRAWs come in with Bezier nodes whereas they’d be better as Linear. Perhaps that’s a DS limitation?

Regards,
Tone :slight_smile:

#2

I guess it could be, though each key can have it’s own slope which is what the other 2 columns are on each key, set to 0.000000.

But as I said, I have no official information :slight_smile:

Why do you want the keys to be linear? Does it do wierd things when you render in fields or something? I almost always am tracking on frame-based material so I’ve never tried. Just curious what the issue is. Monet/Mocha can track in fields and it looks like it makes keys for each field when you do that.

#3

Interestingly, the first line of the .fraw files Mocha is generating says

600 20

where 600 is the number of keys (in my case) and 20 which is the interpolation of the fcurve… however, the only values I know to be valid are 0 for Constant, 1 for Linear, or 2 for Spline (but I don’t have an SDK so maybe 20 does mean something? :confused:)

#4

Guys we are glad to see the active discussions on our forum.

To add to your discussion on tracking interlaced media, note that Mocha by default only tracks every second field.

If and when it is required to track every field simply activate “Track Individual Fields” under Track / Input.

As for exporting / importing the data as linear vs bezier we will have to get back to you.

#5

—Quote (Originally by tonyjover)—
Ahh - think I’ve just sussed it. Mocha had assumed 24fps by the looks of it.
—End Quote—

Yes it’s critical that the DS and Mocha project FPS match.

NOTE: For DS only it’s important that the aspect ratio (Clip / Film / Pixel aspect ratio) matches!

#6

Hey Tone,

Fancy seeing you here …

I had the same problem / solution. Seems I had to be very specific about what I had given Mocha to work with.

Jef

#7

Ahh - think I’ve just sussed it. Mocha had assumed 24fps by the looks of it.

I’d still like to see the Fraws come in as linear though.

Cheers,
Tone :slight_smile:

#8

Hi Bob,

Well, for interlaced material yes I could track in fields, but that’s twice as much tracking as tracking in frames. If there’s no wild inter-field movement then frame tracking will be just as precise.

DS’s guides have always stressed the importance of making tracks linear, and I’m used to that workflow.

And to answer the first bit of your question last, yes, if you leave the curve Bezier as it imports, then every other field is incorrect and you get a blurred result.

>From what you’ve noted, it looks like it might be pretty simple for the fraw export to be linear by default.

Cheers,
Tone :slight_smile:

#9

—Quote (Originally by Bob Maple)—
Interestingly, the first line of the .fraw files Mocha is generating says

600 20

where 600 is the number of keys (in my case) and 20 which is the interpolation of the fcurve… however, the only values I know to be valid are 0 for Constant, 1 for Linear, or 2 for Spline (but I don’t have an SDK so maybe 20 does mean something? :confused:)
—End Quote—

Hey Hi Bob & Jef,

Maybe (just maybe) 20 is 2 for Bezier, and 0 for the slope of the keys. It would explain why we get curves with all the keys with ‘flat’ bezier handles.

Nahhh… that’d be too easy :wink: