Disable Resampling

[John Rofrano]

[Justin Leyba] “Anyone know why Sony even bother automatically resampling the videos in Vegas? When I many people would just disable it to prevent ghosting (30p to 24p)?”

Because then everyone would be complaining that my video stutters and does not look smooth. You can’t please everyone. 😉

~jr

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

[Justin L.]

Wait, won’t disabling it make it smoother? Why can’t they just remove it. What’s the purpose of resampling? Why did they put it there if people would just disable it?

[John Rofrano]

[Justin Leyba] “Wait, won’t disabling it make it smoother?”

Disabling does not make it smoother in all cases. In fact, it actually makes it smoother in MOST cases which is why it is the default.

[Justin Leyba] “Why can’t they just remove it. What’s the purpose of resampling?”

Resampling is needed whenever frames need to be synthesized due to mismatched frame rates. If you did not resample, all you could do is drop frames which may cause jerky motion or duplicate frames which would cause stuttering. Resampling creates new frames that never existed by blending two frames to create the in-between frame that is needed for smooth playback.

[Justin Leyba] “Why did they put it there if people would just disable it?”

I have never disabled resampling and I venture to guess that most Vegas editors don’t disable it.

You would only need to disable it in very special cases where you actually want frames to be dropped or duplicated.

~jr

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

[Justin L.]

People say that to prevent ghosting when converting a 30p footage to a 24p footage, disable the resampling. So I thought people do that more often.

Thanks for the wonderful information tho!

[John Rofrano]

[Justin Leyba] “People say that to prevent ghosting when converting a 30p footage to a 24p footage, disable the resampling. So I thought people do that more often.”

People “say” a lot of things and mostly they are wrong and don’t know what they are talking about. Also people make general statements when they are talking about very specific odd-ball cases and fail to qualify it that way.

I have converted lots of 60i footage to 24p and never disabled resample and never had ghosting. Maybe 30p is different? Heck, my product VASST Celluloid was designed specifically to convert 60i to 24p and not a single customer has ever complained about ghosting and it doesn’t disable resample.

Here is a case where you want to disable resample: you shoot 60p and want to deliver 30p. If you resample, the results will be 30 blended ghost frames per second, but if you disable resample, you simply drop every other frame and get the original 30p you would have had if you actually shot 30p. That is a perfect example of when you want to disable resample.

Most of the time, you want Vegas to resample when changing frame rates and it does this very well. Performing inverse telecine on 60i footage to 24p does not require you to disable resample. Like I said, maybe 30p is causing problems that 60i didn’t. I don’t know but I do know that it’s the exception, not the rule.

~jr

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

[Jose Fernandez]

I’m not an expert by any means, but I always disable resampling because it does remove ghosting. And in my case has nothing to do with any sort of frame rate conversions. I record game footage off of my TV from my console. And when I run that with resampling the outcome is a very muddy blurry video because there is literally so much moving on screen that its just a mess. Disabling resampling drops frames or w/e but it doesnt introduce new ones which is good when the video is full of jerky movements, and constant stuff going on in the screen.

Resampling in my mind would be good for someone who wanted a steadier video shot from a handheld camera to reduce camera shake/jerkiness or something. But I’m no expert on this, just my 2 cents.

[John Rofrano]

[Jose Fernandez] ” And in my case has nothing to do with any sort of frame rate conversions. I record game footage off of my TV from my console. “

So what frame rate do you record from the game console?

~jr

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

[Jose Fernandez]

Bleh.. It does convert frame rates lol. It records at 59.940 according to Sony Vegas. However what I said about the ghosting related sampling is still accurate.

[John Rofrano]

[Jose Fernandez] “Bleh.. It does convert frame rates lol. It records at 59.940 according to Sony Vegas. However what I said about the ghosting related sampling is still accurate.”

Yes it is, but that’s the same example as I gave for when you would WANT to disable resamle. I said:

“Here is a case where you want to disable resample: you shoot 60p and want to deliver 30p. If you resample, the results will be 30 blended ghost frames per second, but if you disable resample, you simply drop every other frame and get the original 30p you would have had if you actually shot 30p. That is a perfect example of when you want to disable resample. “

That’s exactly what you are doing. But your statement:

[Jose Fernandez] “I’m not an expert by any means, but I always disable resampling because it does remove ghosting”

Could mislead people into thinking that they should always disable resample and that is bad general advice. It is particular to your circumstances of capturing double the frame rate. I just want people reading this to understand the difference.

BTW, if your capture device can capture at 29.97 it would also solve your problem.

~jr

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

[Jose Fernandez]

Your absolutely right. Honestly the first time I read your post saying that it didn’t quite click in my head until you mentioned it again. Btw since you seem quite knowledgeable on video editing and Vegas do you think you could take a look at a problem Ive been having regarding playback here -> https://forums.creativecow.net/thread/24/926830