How do I remove this annoying motion blur?

[John Rofrano]

What frame rate did you capture the video? What frame rate did you render to? If they are not the same (and I’m guessing that they are not) then you might be seeing frame blending to reach the desired frame rate.

Right-click on the event and choose Properties | Video Event and select Disable Resample and it should go away. You must do this for all the events that exhibit this behavior.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Carl Lundell]

Record details: 1920×1080, 50 fps
Render details: HD 1080-50i (1920×1080; 25,000 fps)

Disable Resample did not help, I actually tried that for this particular video clip.

[John Rofrano]

said:

“Watch this test video first (fullscreen 1080p): “

Then you just said:

“Render details: HD 1080-50i (1920×1080; 25,000 fps)”

1080-50i is not 1080p!

If you look at the screen shots you supplied you can see the interlace artifacts. If you do have resample disabled, it looks like Vegas is taking one field from one frame and the other field from the next frame. Like you’re getting the 50 frames as 50 fields! I wonder if disable resample is causing this?

If you want progressive video you need to render progressive video (25p). That combined with disable resample should produce the results you expect. i.e., 25 progressive frames with no interlacing.

All of this assumes that your original video did not have these interlace artifacts. You didn’t say if your source was interlaced or progressive.

Oh, and look in your project settings and make sure that your Deinterlace Method is NOT set to None.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Carl Lundell]

I checked my settings and Deinterlace Method is None.

Also, do I need to change my project template into this HD 1080-24p (1920×1080; 23,976 fps) if I want progressive video?

Sorry if I don’t fully understand the meaning of this progressive/interlaced mode.

[John Rofrano]

[Carl Lundell] “I checked my settings and Deinterlace Method is None.”

That explains the interlace lines. You told Vegas not to deinterlace so it left the lines in there. You should never have your deinterlace method set to none. It should be set to Blend Fields, although in your case, some of those interlace lines were very far apart. You might have to use Interpolate fields. But the question remains… where is the interlacing coming from?

[Carl Lundell] “Also, do I need to change my project template into this HD 1080-24p (1920×1080; 23,976 fps) if I want progressive video?”

I can’t tell because you still didn’t say if your source was interlaced or progressive.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Carl Lundell]

Interpolate fields did it! =D

Here’s my result: https://www.youtube.com/watch?v=mY3oLXkUaqw

So I guess everything is good now? I don’t know if the source is progressive or interlaced. How do I see that?

How come my first video clip wasn’t in 1080p? On YouTube I had the option to watch it in 1080p… but you’re saying HD 1080-50i isn’t 1080p. Please explain, I’d love to learn more about this… I’m new into the scene.

Thanks for your help =D

[John Rofrano]

[Carl Lundell] “So I guess everything is good now?”

If you’re happy with the results… that’s all that matters. 😉

[Carl Lundell] ” I don’t know if the source is progressive or interlaced. How do I see that?”

Right-click on a source event and select Properties. Then select the Media tab and look at the Field order. if it says “Upper field first” or “Lower field first” it’s interlaced. If is says “None (progressive scan)” it’s progressive.

[Carl Lundell] “How come my first video clip wasn’t in 1080p?”

Because you rendered it as interlaced, not progressive.

[Carl Lundell] ” On YouTube I had the option to watch it in 1080p”

That’s because YouTube will deinterlace your video for you and make it progressive but you had the wrong setting in Vegas when you set Deinterlace Method to None so the interlace artifacts were not handled correctly.

[Carl Lundell] ” but you’re saying HD 1080-50i isn’t 1080p. Please explain, I’d love to learn more about this… I’m new into the scene.”

It all started back in the early days of Television when electron beams excited phosphor on a cathode ray tube to create an image (actually this is how all CRT’s work even today). The beam scanned from top to bottom to create an image. Originally, by the time the beam got to the bottom, the top phosphors had started to fade. Since they couldn’t make the electron beam scan any faster, they came up with a solution by only scanning every other line, first odd then even, and making two passes per frame. Now it only took half the time to scan the odd lines before you were back at the top scanning the even lines. This made the image stay on the screen long enough to trick your eyes into thinking the image never faded.

They call this collection of odd or even scans a “field”. When you see field order in Vegas and it says “Upper field first“, this means that first line was scanned first so all the odd lines were scanned and then the event lines were scanned. If Vegas shows that the video is “Lower field first“, it means that the second line was scanned first so all of the even lines were scanned and then the odd lines were scanned. Some analog devices capture video upper field first and most digital devices capture video lower field first. It’s very important to play the fields back in the same order that they were captured.

1080-50i refers to 50 interlaced fields per second. Since it takes two fields to make a single frame (upper and lower) you divide this by 2 and get 25 frames per second. So whenever you see a little “i” you know that the video is interlaced. If you want that video to be progressive, you must deinterlace it! Deinterlacing is the process of combining the two fields back into one frame. Since you told Vegas not to deinterlace, it simply wrote the two fields out to the video BUT you had something else going on. Your source video was 50fps and Vegas had to convert that to 25fps so it took one frame and made it the lower field and took the next frame and made it the upper field and that’s how it turned 50p into 50i.

When you select a deinterlace method of None, Vegas will ignore the fact that any video is interlaced. You should only use this setting if you plan to use a 3rd party deinterlacer if you have any interlaced video in your project. Otherwise things might not be processed correctly as you have seen.

When you select a deinterlace method of Blend Fields, Vegas will use both fields and blend them into one progressive frame. If there is too much movement between the two fields, you will still see some of the interlace lines appear as sort of a ghost image.

When you select a deinterlace method of Interpolate Fields, Vegas will throw away one field and duplicate the other. This gives you 1/2 the vertical resolution but it solves the problem of seeing the interlace lines.

So you lost 1/2 of your vertical resolution by using Interpolate Fields but that may be the only solution if your original video was interlaced and there was too much movement to blend the fields. As I said, if you like the results… you’re done.

I know that’s a long explanation and was maybe more information than you needed but sometimes it’s good to know “why” things are the way they are. Hope that helps.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Carl Lundell]

Yes, I’m quite satisfied about the result of my test video. You’ve answered all of my questions, thanks! 🙂

Hah, that was a good explanation.

I’ll get back if new problems occur… Cya for now.