DNxHD (.mxf) export with alpha channel

Hello!
I'm working with one Finnish children's feature film which will star end of this year as an DIT. Movie will include lot's of green screen and the production want's me to do chroma keyed DNxHD 36 renders with alpha channel for AVID editorial. So far I have found out that neither davinci desolve nor assimilate scratch can't do it. Is it possible to render DNxHD with alpha channel from AE? And can Avid import these files with alpha channel? All help is needed and appreciated.
Cheers
Antris

Are you sure your alpha is there? (check by pressing "a" with the mouse over the view window).
Did you try telling FCP that there is an alpha channel? If you did "Send to Shake", Final Cut Pro doesn't expect that the QuickTime it's getting back will contain an alpha channel (It's meant to match your sequence settings). You might try dragging the output directly into the browser to re-import it and see if it recognizes the alpha...
As a matter of fact, maybe you can check in QT Player, load it into QuickTime Player, cmd-j, click on the video track and play with the transparency setting. Try Straight Alpha - that should lead to the background going white - then you'll know its coming out of Shake properly and concentrate on getting FCP to recognize it...
If all else fails (I did just try it here and it worked), maybe try a TIFF or TGA sequence?
post back,
Patrick

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Hi Dast Media,
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I think you are just seeing the extra areas of the fill.
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So, I have an intro that is designed as an overlay of the incoming video. The objects move out the way to reveal the video underneath. BUT, when I export the sequence the resulting movie has black in the background.
Now, I had this issue several months ago, and after tons of research and trial and error, all of a sudden it worked when I came back to Motion on another project. No explanation. It just worked.
Usually, I have the background set to Transparent and then export using Lossless and Alpha. Works fine. Well, not today. I've changed every export setting under the sun trying variations of Lossless with Alpha and also tried the Animation codec. No luck.
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Thanks for your help Patrick. I tell ya, I can't believe what's going on. As I said, this project until today has not caused me any issues what-so-ever. The other six sessions are totally fine. I also created a quick project with the same settings added text - then exported using the same settings I've used before, and it exports with the proper alpha channel.
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I want to export with alpha channel using a codec that carries less data than gopro cineform

Hi--I want to export some intermediate files with an alpha channel. i'm using gopro cineform, and these files end up being so large, meaning that i have to sit through hour long renders. is there a a codec i can use that has an alpha chanel but creates a smaller file size?
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Thanks for your help Patrick. I tell ya, I can't believe what's going on. As I said, this project until today has not caused me any issues what-so-ever. The other six sessions are totally fine. I also created a quick project with the same settings added text - then exported using the same settings I've used before, and it exports with the proper alpha channel.
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Can't export with alpha channel

PROBLEM: No matter what export settings I use or manipulate I can't get the exported movie to have an alpha channel.
I've read several threads on this, and none of them solved my issue. Temporarily I just imported the Motion 3 project and used it as my overlay video - it's a title intro that slides out to reveal the video underneath it.
However, I'd prefer to create self-contained QT's as there are 7 sessions.
In After Effects I'd typically choose Animation and select 'using Straight Alpha'. Motion has a preset of Lossless + Alpha Movie, or you can go to advanced and select Output tab and deselect Pre-multiply Alpha. Neither works. The exported video still has black. What's totally insane is that I was using these settings up until today and everything was fine!
And yes, I've chosen 'Transparent' under the view options and still black is always included.

We do have an answer, it's usually a simple user error: not being able to tell the alpha is really there. If you're watching in QTPlayer, you will see black. If you open the movie in FCP, you should be able to change the alpha interp to suit.
Even if OPs claim to have tried this, it's still the first thing that comes to mind and, since the OPs rarely return to tell us what REALLY happened, we are left with the assumption that this was the problem all along.
If you set your render controls to Animation with millions of color + (many of us simply forget the PLUS) and we presume there is no solid shape or opaque layer (easily missed in Motion's weird timeline display) it is fundamentally impossible not to get an alpha.
Not to say it can't happen but I've been on support forums for AE, Media 100, FCP and others for more than a decade and I have never heard of the Animation codec actually failing. It is always user error or a broken application.
I hope you folks find a new and unique solution that we can add to the list. But this is the best we know to give you: Check and recheck the easy stuff.
bogiesan

EXPORT WITH ALPHA CHANNEL

I need to know how to export a clip with the alpha channel intact. I keyed a green screen shot and exported it, but everytime i open it in final cut it has a black background. Need help asap it is the last shot I have to do for a music video that has to be done by monday, thanks.

Are you sure your alpha is there? (check by pressing "a" with the mouse over the view window).
Did you try telling FCP that there is an alpha channel? If you did "Send to Shake", Final Cut Pro doesn't expect that the QuickTime it's getting back will contain an alpha channel (It's meant to match your sequence settings). You might try dragging the output directly into the browser to re-import it and see if it recognizes the alpha...
As a matter of fact, maybe you can check in QT Player, load it into QuickTime Player, cmd-j, click on the video track and play with the transparency setting. Try Straight Alpha - that should lead to the background going white - then you'll know its coming out of Shake properly and concentrate on getting FCP to recognize it...
If all else fails (I did just try it here and it worked), maybe try a TIFF or TGA sequence?
post back,
Patrick

No Method of Batch Export for Clips with Alpha Channels?

Good morning,
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Anyway, I have several sequences that I would like to export as 32-bit TGA QuickTime files, preserving their transparency. If I Export Using Compressor, the process results in pre-rendering of the sequence, turning the transparent areas black. The same problem occurs if I export QuickTime reference movies from FCP and open them directly with Compressor.
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Thanks, Andy, "Batch Export" eventually did the trick!
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What codec to convert .MXF and MP4 files into to use with alpha channels in Ae and Pr CS6?

When I import .mxf File, shot on a Canon C300, into after effects, the alpha channel options are greyed out, when I look in, interpret footage, main. This also is the case importing .MP4 files, shot on a Gopro hero 3. I used to use final cut and using compressor convert the files to pro res 4444 or 422. What's my new workflow for preparing files with alpha channels to use in After Effect and Premiere and do I use Media Encoder to do it?

When I import .mxf File, shot on a Canon C300, into after effects, the alpha channel options are greyed out, when I look in, interpret footage, main. This also is the case importing .MP4 files, shot on a Gopro hero 3.
Better question: Where do you expect that Alpha channel to come from and contain any useful info for transparency? You're making a fuss over a non-issue. Unless you apply keying or other methods of creating transparency, even if there were an Alpha channel it would be fully opaque and then what's the point?
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Yes it looks perfect in Quicktime.
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Hi,
I have this FLA with animation and when played, the animation has alpha channel. I can’t understand why when I look in the library I see the frames without the alpha channel and also when I try to export/extract the image again the image don’t have alpha channel.
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"when played, the animation has alpha channel"
how are you playing the animation? control/enter in Flash, Publishing to a Web page or what?
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What is the aniimation? a series of images, one image moving? Are teweens imvolved?
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How are you exporting the image? is it a single image? or a series of frames that makes up an animation?
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Have you ever tried to export a simple .png before so that you see and understand the dialog box that pops up during export? are you chosing "24 bit with alpha channel" in the "Colors" choice?
For those of us who may not want to download your file, please provide a more detailed describtion of everything related to this question.
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Adninjastrator

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Hi there,
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I’m trying to export an animation with Premiere CS5. I made an animation of a rotating object in Maya and exported it with alpha channel as tiff images. Then they are edited with Photoshop to give them a drop shadow.
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Thanks alot for the help.
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Can no longer import QT files with alpha channel

I have been using these client supplied QT with alpha channel files just fine for weeks, then all of a sudden, after a crash the other day, I was unable to open sequences with these files and exoprt them, the exporter would just freeze. the clips played in the timeline, but VERY sluggish.
On the reccomendation of a few posts around here, I removed the clips from the project, and now I cannot import them back in, I get a "the importer reported a generic error" message. I am able to open in QT pro and export to a new file that will import to PPro, but I lose the alpha channel.
As always, I'm up against a deadline and any help would be greatly appreciated.
I have installed QT 7.07, no help.
I'm on a windows 7 machine running CS master collection 5.0, Quad core AMD with 8 gig RAM.
These files worked fine just days ago!!!!
BTW, I just switched over to Premiere a few months ago and to honest I can't understand how anyone would stick with this buggy software, as a professional I've never used anything this bad before.

Welcome to the forum.
Try these. Attempt to re-import after each one:
Clean the media cache database via Edit | Preferences | Media
If step 2 doesn't work, then find all the .qtindex, .mpgindex, .cfa and .pek files associated with the media that's supposed to be in your project and delete them. Then clean the media cache database again.
Launch Pr and while it's launching, hold down the Alt + Shift keys until the Welcome screen appears. Alt resets your preferences and Shift resets the plug-in cache.
To address the other issues you say you've been having with Pr, you should start a different thread (or threads). Coming from other editors, there may be a difference in the way Pr does things that produce unexpected results that may be seen as bugs. More serious issues, such as crashes, can often be caused by 3rd-party hardware like AJA, Matrox or BlackMagic and the associated drivers. Outdated or incorrect drivers for audio and video cards can also cause problems. I recommend that you start troubleshooting those areas first.
Other issues may have workarounds. If you have serious, reproducible problems that have no workaround, then please file bug reports here:
Adobe - Feature Request/Bug Report Form
-Jeff

FLV files exported with Alpha have extra frames after end of sequence.

Sequence is 588w x 486h Animation+ codec, talent chroma-key (Conduit) on track 2 with no background on track 1. Flash 8 is installed. When I export using the QuickTime Flash export component using On2 VP6 with Alpha Channel settings, the resulting FLV has additional frames up to around 20 seconds for a 2 minute sequence. These additional frames are a freeze of the last frame in the sequence. I tried several different sequence codecs/Spark codec with same result. Even setting an In and Out on the sequence does not help.
One symptom I have noticed, is that when I click in the timeline beyond the last frame of video, I still see the last frame of video in the Canvas (But not in the BlackMagic video card output). Normally I would see black or checkerboard.
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I have found what I believe the cause of the extra frames issue here, so I thought I would post it for others.
This appears to be caused by a problem between the Adobe FLV Export Component and QuickTime 7.2.  Adobe's website says that Flash encoder has issues with non 44.1 kHz audio.  Changing the sequence settings to 44.1 and rendering the audio solves the problem and FLV files exported from the timeline or via batch export are the correct length.
Exporting FLV files using either Spark or On2 VP6 with alpha, used to be a breeze with awesome results.  I do this all day to support our Flash developers.  The audio issue is easy to work around, but I also get random errors in the alpha channel of these movies now.  These single frame errors appear as black flashes.  There is nothing in the timeline that would appear to cause this.  Re-exporting sometimes fixes it, or simply moves the error somewhere else in the timeline.    This may also be related to QuickTime 7.2, but I don't know.
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MXF export with audio problems

Hi!
At the brodcast station that I work we recently upgrade to premiere CC. Our workflow are almost XDCAM files (MXF) and whe an edition is finished we export to MXF to play out or copy to XDCAM disc.
Recently I have a multi camera project and everything works perfect but when I export to an MXF file the sound as a "blank frame" in sound. The concert as an hour and twenty minutes and at the fisrt second
theres is that little "cut" in sound that doesn't exist in timeline.
I tryed various ways to export and everytime I got this frame in the same place. I also export timelines with 2 minutes from other projects, more simple, and always I got a "blank frame" somewhere in audio.
Tryed to export with 2 channels, 8 channels, stereo timeline multichannel timeline and everything result in a MXF in this audio issue.
Anyone already detect this exporting to MXFs, any sugestion to resolve this problem?

Thank you norok65 for replying this post.
I searched for some post with my problem and I didn't find so I post this one. I'm "glad" that I'm not the only one having this Kind of problem.
Like you said the problem cames with some updates. We used Premiere CS5 and no problem with MXF. We tryed the CS6 to possible update and
at the begining no problem but after some updates this problem appears and we abandoned the CS6 and we tested the CC. No problem with CC
and we did the migration. So, CC export MXFs with no problem but after some updates the audio problems came up again.
I think the problem is the updates and Adobe must fix this.
Jim, I already did some tests and exported only audio to WAV and no problem. Other formats like quictime no problem too.
This kind of problem only appears with MXF.
Like I said our workflow are almost everything in MXF (XDCAM) and we wish this issue can be solved.

DNxHD (.mxf) export with alpha channel

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