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Import Video w Alpha-Channel

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Søren Sørensen
Import Video w Alpha-Channel
on Nov 30, 2014 at 9:03:18 pm

Dear Forum,

Is it possible to import a videofile with an alpha-channel into Vegas Pro 13?

If yes: is there a list available on which video-file-types are supported when importing into VP13? I have not been able to find one myself.

I do CG myself in Blender, and now I hit a wall with rendering videos that are importable into VP13...

Thx in advance!
/Søren


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Graham Bernard
Re: Import Video w Alpha-Channel
on Nov 30, 2014 at 9:35:48 pm

From Particle Illusion I use Lagarith and it's RGBA control. Works perfectly. Once in VP I need to use Premultiplied.

Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Søren Sørensen
Re: Import Video w Alpha-Channel
on Nov 30, 2014 at 9:46:27 pm

Hi Graham,

Wow, great fast reply - BUT can I ask you to elaborate a bit on the answer. As fairly new to this field I only partly follow your guide.

(i) Is particle illusion a freeware program? Does this mean no to the first question - that Blender cannot make video-files with an alpha-channel?
(ii) Where in VP is the Premultiplied setting?
(iii) If I got it right: Can i simply download pIllusion and quite easily fill in the *.png-sequence and hit render as Lagarith. And finally drag'n'drop this to Project media in VP13?

Thx again!
/Søren


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Graham Bernard
Re: Import Video w Alpha-Channel
on Nov 30, 2014 at 10:43:57 pm

I downloaded Lagarith from here: http://lags.leetcode.net/codec.html

I use this to render from inside Particle Illusion - pI. pI is a great piece of s/w that produces , well, particles for all sorts of things: Dust; Smoke; Water; Flames . . fireworks . . . But I can use the CODEC of my choice so that its particles sit on a transparent<>ALPHA background. pI is for prticles, if YOUR s/w allows you to select an ALPHA channel CODEC - which you asked for - then use your s/w. pI is purely a way to produce particles.

OK, once I render out from pI, using Lagarith and choose the RGBA - the A is the ALPHA channel - then I bring that render into VP. Once inside VP I right click on the pI Event's Properties and CHOOSE Premultiplied and I get my particles sitting on/over the video.




Track 1 : pI Premultuplied Particles

Track 2 : My Video Event

HTHs

Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Graham Bernard
Re: Import Video w Alpha-Channel
on Nov 30, 2014 at 10:51:00 pm

Look, if you already HAVE and KNOW you have an ALPHA channel, just right click on that Event and choose Premultiplied or the "Dirty" Premultiplied.

Grazie

Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge


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Steve Rhoden
Re: Import Video w Alpha-Channel
on Nov 30, 2014 at 11:27:42 pm

You can easily export from Blender your files in The Quicktime PNG
format or Quicktime Animation format, that way your alpha channels
are preserved and when you drop them on the Vegas timeline you change
the Alpha Channel to Premultiplied.

Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
http://www.facebook.com/FilmexCreativeMedia


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Russ Froze
Re: Import Video w Alpha-Channel
on Dec 1, 2014 at 12:13:24 am

Or you can export Quicktime .mov with the animation setting. Then there is the old school .avi uncompressed with alpha setting.

There are choices of image sequences that are the preferred method for more complex renders that take minutes or even hours per frame. The reason is mostly due to errors in a render. Say it takes 3 days to render an animation but something went wrong in lets say frame 394 or the power went out. It is quicker to render 1 frame or pick up from where the sequence was truncated. Also an image sequence render can be spread over multiple computers reducing the render time.

Image sequences that support alpha come in all sorts of flavors and png is an acceptable format there are other formats that support alpha but they also carry a great deal more information so they tend to be much larger. Also compositors will ask for passes of different layers and or elements from the CG department/artist. This is to facilitate relighting or blending the element into live footage without having to go back to the CG render which may have taken several days. Spectacular highlights, occlusions, shadows, depth of field are but a few layer that a compositor would request.

So best practice is to render an image sequence to give to a compositor who will pass it on to the editor. Even if that happens to be one person, which in this case is yourself.
Russ Froze


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Søren Sørensen
Re: Import Video w Alpha-Channel
on Dec 1, 2014 at 1:39:48 pm

Hi again,

Thank you for answers! I think you gave me enough combined knowledge that I figured out a 'good' way of doing it.

That is to render an animation in Blender and be able to import this into Vegas Pro 13 with an alpha channel.

The way I ended up doing it was:
1: Blender: Render animation as individual *.png's

2: Vegas Pro 13: Import image sequence (all the *.png's) - remembering to go to options->preferences-> and set the still image duration to whatever framerate you want.

3: I think I can answer my own initial question now. At the moment, blender version 2.72, it is not possible to render a movie-file with an alpha-channel at all. The options are AVI JPEG, AVI RAW, FrameServer, H.264, MPEG, Ogg Theora, Xvid - of which none have a RGBA option (only BW and RGB). Fortunately there are several ways around this.

BR
Søren


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Steve Rhoden
Re: Import Video w Alpha-Channel
on Dec 1, 2014 at 1:41:08 pm

Great..

Steve Rhoden (Cow Leader)
Film Maker & VFX Artist.
Owner of Filmex Creative Media.
Samples of my Work and Company can be seen here:
http://www.facebook.com/FilmexCreativeMedia


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Russ Froze
Re: Import Video w Alpha-Channel
on Dec 3, 2014 at 3:32:15 am

[Søren Sørensen] " remembering to go to options->preferences-> and set the still image duration to whatever framerate you want."

Actually exporting from blender as an image sequence is the way. The frame rate is embedded in the individual png. Vegas will read the image sequence and identify the frame rate. All you need to do is
import media, navigate to the image sequence and highlight the first frame. There is a checkbox "open sequence"
Russ Froze


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David Eon
Re: Import Video w Alpha-Channel
on Jan 14, 2015 at 8:30:22 am

If you are unable to export an alpha channel along with your image sequence / rendered video out of Blender, you can change all of your objects to white and all of the background to black and create a separate alpha render.

Then import that separate Black and White sequence on the track above your video (being sure to line the videos up exactly). Create a Parent track above that track and set both your alpha and your blender model render as Child tracks for the parent.

Then on the track that has your black and white alpha, set your track compositing mode to Multiply Mask and create an event FX on your alpha (black/white) to Sony Mask Generator. You should be able to use the Alpha or Luminance setting, but try it and see what works.

Let me know if that helps!
DavidEon


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