Question about super-sampling

[John Rofrano]

[Marius Dudu] “Does applying supersampling from Master Bus will make any difference, if FPS from project is 30 fps and rendered video 25 fps ? Or vice-versa, from 25 fps to 30 fps.”

A difference in the video quality? No.

Super Sampling will only affect motion created inside of Vegas Pro. This includes the media generators, pan/crop, track motion, FX, or transitions. It samples at a higher rate too smooth motion at the expense of compute power. It does not improve video quality itself.

If you want to see it’s effect, create a white circle with generated media and animate it moving across the screen and render that out. Look at it frame by frame. Then apply super sampling and when you look at it frame by frame, you will see motion blur added to make the movement much smoother because It adds interframe motion blur to these types of motion. BTW, you will only see this in the preview window if it’s set to Good or Best.

I’m not sure it would help with converting from 25fps to 30fps video since it works on internally generated video images.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Marius Dudu]

Thank you John I appreciate your elaborate feedback across this forum (I’ve been reading these boards from a while) .
Lately I was putting my efforts in a project with multiple video segments of different fps (29.970 fps, 25 fps) from which I want to build one final piece of 25 fps. I managed to find a way to get good video quality (also good in terms of smoothing and no ghosting) but the drawback is that audio gets out of sync.
Is there a direct way to convert audio track from 29.970-fps-video to 25-fps-video using Vegas or Sound Forge ?

[John Rofrano]

[Marius Dudu] “Is there a direct way to convert audio track from 29.970-fps-video to 25-fps-video using Vegas or Sound Forge ?”

Actually what I would do is convert the video and audio from 29.97 to 24p which will use inverse telecine and keep the audio in sync. Then speed it up to 25fps and it should not be noticeable. Most movies which are 24fps are converted to 25fps just by playing it back one frame faster per second faster. For Vegas Pro I believe all you need to do is drop the 24p footage on a 25fps timeline and Disable Resample on the event and it will just play out back at 25 fps with audio in sync.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Marius Dudu]

When I convert 29.97 fps to 24 fps the video is very choppy.
To speed up the video from 24 fps to 25 fps, what value should I enter for Playback rate ?

Thank you

[Marius Dudu]

I believe the number is 4 %, so value 0,96 in my case. But why 4% ?

[Marius Dudu]

I believe the number is 4 %, so value 0,96 in my case. But why 4% ?

[John Rofrano]

[Marius Dudu] “When I convert 29.97 fps to 24 fps the video is very choppy.”

Do you have your project Deinterlace Method set to Blend Fields?

Also make sure that sampling on your events are set to: Smart Resample

If your deinterlace method is set to None and you Disable Resample on events, then going from 29.97 to 24p will simply drop frames and make it very choppy.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[John Rofrano]

[Marius Dudu] “I believe the number is 4 %, so value 0,96 in my case. But why 4% ?”

Do the math: 24 / 25 = 0.96 or a 0.04 (4%) difference in speed.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Marius Dudu]

Yes, the project’s Deinterlace Method is set to Blend Fields. If I use Smart Resample, I get a lot of ghosting.
I uploaded here, 8 secs of 29.97 fps video from which I want to convert into 24 or 25 fps (the file is test.mp4):

https://mega.nz/#F!EVc00aJS!zhNbI6CnLs7RyaMorcB3WQ

I have noticed from your screenshot that in Project Properties, the following setting is enabled: “Adjust source media to better match project or rendering settings”. Actually I was trying to render with and without this setting active, but I didn’t see any difference.

Another thing I want to ask, is there any plug-in able to convert right away 29.97 fps to 25 fps. Or a dedicated app, most likely with batch function? This would be perfect because I have numerous videos captured at the speed of 29.97-30 fps, using the smart phone.

Thank you

[John Rofrano]

[Marius Dudu] “Another thing I want to ask, is there any plug-in able to convert right away 29.97 fps to 25 fps. Or a dedicated app, most likely with batch function? This would be perfect because I have numerous videos captured at the speed of 29.97-30 fps, using the smart phone.”

The “frame blending” method that Vegas Pro uses will almost always produce ghosting going directly from 29.97 to 25.00. You will get better results by using some kind of “optical flow” plug-in. Boris FX has BCC Optical Flow but it is not free. I believe the free version of Davinci Resolve has an optical flow that can be used to convert 29.97 fps to 25 fps with good results. I realize that this means learning a new NLE to process these files but it may be worth it just for this one job if you have a lot of files.

If not, the proper way to do this in Vegas Pro is to reverse telecine the video from 29.97 to 23.976, then you speed up the video to 25fps and pitch correct the audio to account for the speed change.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com