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Clips Don't Export Correctly After Rendering

Posted: Tue, 22nd Dec 2009, 12:38am

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mpiercearrow

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I am using VisionLab to sweeten footage shot on Panasonic HVX200s and edited on Avid Media Composer. I set up the VL media properties to be consistent with the input, but when I exported back, the footage is not formatted correctly at all for my project. I therefore can't splice in the sweetened material.

1920 X 1080 is the resolution I'm using in DVhx50PRO format. I exported the AVI from a QuickTime single video file back to AVI (my VL crashes if I export back in QuickTime). I set VL up for the editing with an even interlace and a 4:2 setting. There doesn't seem to be a lot of options in VisionLab to adjust the rendering settings, and Media Composer doesn't have a way to convert the footage imported because it's not a transcoding issue.

I love the gaussian effects and many other things that can be done with the program, but am frustrated at this initial development with this basic premise. In addition, the quality of the video I get back is not up to par with what I put in to it, either.

At this point, if I can get the formatting thing worked out, I only see VisionLab being good for transition work, and not something that can stand up to ongoing exposure in a serious project of any length.
Posted: Tue, 22nd Dec 2009, 1:01am

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Axeman

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I'm not seeing where you explain what is wrong with the clips after you export them. You say its not formatted correctly, but don't explain in what way. How to correct the issue will relate directly to what is wrong with the formatting.

Most of the options for rendering adjustments are located in the Compression Settings window, not the Render Settings.

Does VisionLab crash during any Quicktime render, or only with a specific codec? Which codecs have you tried?
Posted: Tue, 22nd Dec 2009, 1:15am

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mpiercearrow

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They revert back to a square format. I've tried to render the same clip in all the various compression settings, including uncompressed. My project is in widescreen. As far as the crashing, yes, it doesn't matter what codec. If I render in QuickTime it crashes. When I render in AVI, no problem.
Posted: Tue, 22nd Dec 2009, 3:15am

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Axeman

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I'm not all that well-versed in HD video, but I'm fairly certain that 1920x1080 footage is actually 1440x1080 with an anamorphic pixel aspect ratio, in the popular HD formats. This appears to be confirmed by this article on the DVCPRO codec. I suspect the fix is as simple as setting the pixel aspect ratio to widescreen after importing your footage back into Media Composer.

Basically the same principle as widescreen dv footage, which is still 720x480 (NTSC) but uses differently shaped pixels.
Posted: Tue, 22nd Dec 2009, 4:22am

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mpiercearrow

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Thanks Axeman,

I found a reformat parameter in my Media Composer effects palette. What about the pixel quality of the rendered clips coming from VisionLab? Any suggestions about how I can get back what I put in? The images are blown out chromatically, with heavy pixelation if the pixel aspect is adjusted above 20.
Posted: Tue, 22nd Dec 2009, 4:26am

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Axeman

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Are you rendering to AVI uncompressed? Or which codec are you rendering to? Does the rendered footage look different that the footage does within the program?

As I mentioned before, I dont' have much experience with HD footage, but I know the FXhome guys have an HVX200 at the office, so they may have some suggestions when they get in tomorrow.
Posted: Tue, 22nd Dec 2009, 9:12am

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Simon K Jones

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This does sound like it might be a codec issue - there's certainly no reason for the colours to get mixed up otherwise. As for the widescreen issue, as Axeman says you just need to specify the video as being widescreen/16:9 in your editing software. The widescreen data is all there correctly, it's just not being interpreted correctly.

As you sure the footage is interlaced and not progressive?
Posted: Tue, 22nd Dec 2009, 4:31pm

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mpiercearrow

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Well,it just crashed on me again when I tried to render and set compression on a composite. The clips that I had most success with rendering, as far as realistic colorization, were compressed with Microsoft 1 codec at 75%.

I'm a newbie, but I do have a suggestion for your program. It would be really nice if effects could be nested into one another (as in Avid) or butted next to one another. I tried to do a gaussian blur to a sequence with several reverses and with the doubled layers that takes, had to split the sequence. You can only stack so high. And then after all that work, found the color pixelation to be whacky.

I'm still climbing the steep learning curve of your program, but I'm getting the feel for the system. *One thing you forgot to mention in your tutorial on rendering was that if you have a sequence you are going to be rendering, be sure and have the in and out points placed correctly at the beginning and end of the sequence. Otherwise you'll only get your last segment in the sequence exported.
Posted: Mon, 11th Jan 2010, 4:38pm

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leonado2

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Personaly when I export from VLab, I export uncompressed. This will keep the quality up to the standard you imported.
Posted: Tue, 12th Jan 2010, 2:44am

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mpiercearrow

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Thanks, Leonado. I exported back to Avid uncompressed as you suggested and found the quality to be good. I still had to reformat the display ratio, however, in order to fill the screen. What is your experience with audio sync and export. What I mean precisely is, I took a sequence and edited in VL and then exported it back. The file was QuickTime and the framerate was 29.97 NTSC. I laid the audio track to the imported VL clip, and it was out-of-sync. Now, I know VL doesn't have anything to do with audio, but is the something I should know in order to compensate for the audio lag?