NextPreviousHomeBT rendered output size does not match source image size.

NFAToys | 14 years ago | 4 comments | 3,891 views

When I create an image layer and import an image that was was saved as a video frame snapshot from Sony Vegas at 655x480 square pixels [720 x .909 = 655], the video image rendered in BluffTitler is not displayed at exactly the same size when opened back up in Vegas.

If I render a movie in BT using the NTSC DV Square Pixel setting at 720x480, 4:3 DAR and 1:1 PAR, the resulting AVI file image is just slightly smaller than the original video frame snapshot image. It is very close, but not exactly the same size. It looks as though it may be just a few pixels narrower that the original snapshot. It's not as though it was grossly the wrong size. It's just a few pixels off.

Any ideas why this is happening? I know that if I try to set a PAR in BT of 909:1000 it gets truncated to 9:10.

Thanks for any help




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When capture image from video frame in Vegas, must set the preview properties to Best and Full. to get the correct size and best quality.

Movie from BT imported into Vegas timeline. Click pan and crop icon. mosue over the picture and right click. select option "match output aspect". Easier solution

bylaw, 14 years ago

Thanks. Yes I did all of that. Preview window was opened up very large. Properties set to Best - Full to create the snapshot.

When the BT video was opened back up, setting the Match Output Aspect effectively did nothing because the rendered video was a square pixel DV stream that expands to 720x480 in the project.

It's almost as though the rendered video images inside the DV stream were not matched exactly to the 655x480 NTSC DV size spec.

NFAToys, 14 years ago

DV video is field. Image is Square. Image captured from video frame is field. Rght-Click the image on the timeline, select properties, select media tab, change the pixel aspect option.
Hope this help

bylaw, 14 years ago

I'm not sure I follow what you're saying. The snapshot saved from the Vegas timeline is 1:1 square pixels 655x480 as displayed in the Vegas event properties. This is the image used in the BT image layer. I create several keyframes that generate a fly-in 3D motion track on the image. I then render this to a video clip.

The video clip rendered by BT using NTSC DV square pixel settings 4:3 DAR & 1:1 PAR shows up as 720x540 1:1 square PAR in the Vegas event properties.

Another observation. If I change the image layer from any of the 3D settings to 2D Full screen, the image is more correctly rendered in the display, but still not correct in the output video clip. However I need a 3D setting because I'm looking to apply a 3D effect.

The difference between a rendered video using 2D, and another using a 3D selection creates a completely different result in the output video, using the same project rendering "show size" settings for each. The appearant scaling of the original image in each video is different. This may be more likely what's going on here.

It appears that in either clip, the 655x480 1:1 PAR source image, is not being scaled correctly in the NTSC DV 1:1 PAR output video clip. The image in each clip appears to be zoomed-in slightly from the original, but in different ways for the 2D and 3D settings.

NFAToys, 14 years ago

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