Quantcast How to slow-mo videos, change framerates to slow it down - digitalFAQ Forum
Go Back    Forum > Digital Video > Video Project Help > Edit Video, Audio

Reply
 
LinkBack Thread Tools
  #1  
04-06-2010, 03:28 PM
dyfan dyfan is offline
Free Member
 
Join Date: Apr 2009
Posts: 128
Thanked 16 Times in 16 Posts
Quote:
It may be possible to create slow-motion video in VirtualDub by altering the framerate settings, but I've honestly never tried. I'll look into it if you're really wanting to use it for this process.

Ask whatever question you have, I'll answer as best I can, as quickly as I can.
How could I:
Slow down an existing video (image + sound) file by .9375%? (The motor in some home dubber's VCR ran just a little too slow...) If Womble products didn't produce the WORST encoding quality in the history of electricity, I wouldn't need to ask here...
Reply With Quote
Someday, 12:01 PM
admin's Avatar
Ads / Sponsors
 
Join Date: ∞
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #2  
04-29-2010, 05:16 AM
admin's Avatar
admin admin is offline
Site Staff | Web Development
 
Join Date: Jul 2003
Posts: 4,337
Thanked 631 Times in 452 Posts
I just don't think this is possible, without further ruining the video, deinterlacing it as progressive. Maybe you could separate the fields, and do it, but I'm just guessing here. Worth trying.

29.97fps x 99.0625 = 29.689fps math is wrong, that speeds it up.. I think. I don't know. Try 101.9375%, maybe?
Sorry, you're on your own with the math --- I'm too tired for this today, and I'm video/photo/writer, not human calculator.
If you figure it out, please let me know. Thanks. -admin

Anyway...

This is going to be harder for you, because you're not a VirtualDub user yet. That guide will come when more time is available, as it's complex to write. But for now...

1. Open video in VirtualDub, then after it's open...
2. Go to Video > Filter and then add the Deinterlace filter that comes with the program. Pick the Unfold Fields option. OK, OK.
3. Now it's time to Video > Frame Rate and change to the second bullet box down, and pick Change frame rate to (fps) and then type in 29.689 (or whatever number you decide it should be).
4. Go to Video > Compression and pick the HuffYUV version that you have already installed separately (as per other threads).
5. Go to Audio and pick No Audio.

You may want to only do a short clip for the test, by selecting sections with the Mark In and Mark Out buttons on the drag bar below the previews, on the main VirtualDub window.

Encode it. Wait minutes or hours, depending on speed of CPU in computer, and length of video.

1. Open new encoded video file in VirtualDub, then after it's open..
2. Go to Video > Filter and then change the Deinterlace filter (this assumes you did not close VirtualDub yet). Pick the Fold Side-By-Side Fields option. OK, OK.
3. Encode it.

The video is done.

For the audio, use the Goldwave method shown on the PAL/NTSC conversion guide -- it's the same basic principle. See http://www.digitalfaq.com/guides/vid...t-pal-ntsc.htm

Time warp the audio to match the exact time length of the new video. You don't want to do it by a percentage % and then have it be off, which is most common.

That's all there is to it. I've never tried this before, but it should work in theory. It's not often that I need to re-adjust a slight offset like this -- and generally it's progressive when I do, not interlaced.

If it fails, you can try the full method shown in that PAL/NTSC conversion guide, with the deinterlace step. Yes, I realize you don't have a PAL video, but the method is the same -- just a different %/framerate to input.

Good luck.

- Did this site help you? Then upgrade to Premium Member and show your support!
- Also: Like Us on Facebook for special DVD/Blu-ray news and deals!
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Change sticky color in vBulletin themes admin Website and Server Troubleshooting 2 07-13-2010 02:22 PM
Adobe Premiere 6.5 Timeline Export Extremely Slow... SSStudio Edit Video, Audio 31 12-02-2009 02:19 PM
Slow computer: Do I really need all those programs running? Canon Computers 1 02-20-2009 11:43 PM
About the 2009 analog change (DTV, HDTV) Tranzor Videography: Cameras, TVs and Players 5 06-25-2008 12:28 PM
Anybody here know how to change your IP address? wayshway Computers 15 06-26-2006 11:13 PM

Thread Tools



 
All times are GMT -5. The time now is 05:26 PM