You are viewing an archive of the old fxhome.com forums. The community has since moved to hitfilm.com.

Output Video Slows down In Vision lab

Posted: Wed, 22nd Jun 2011, 9:27am

Post 1 of 8

FXhomer57724

Force: 1000 | Joined: 28th Jun 2009 | Posts: 62

VisionLab User

Gold Member

Hi again and Thanks for eveyone that is willing to help me!!
I shot a video and the frame Width is 720 and the Height is 480, it is a AVI Video clip! Vision lab accepts it and it works in the V-Lab! So, I render it as a AVI Uncompressed at 29.9 frames a sec. When V-lab is done rendering my video, it plays for a sec then it just slows down and dont move like it is suppose to............. Anyone got any ideas why the render video in V-lab is slowing down when the source video plays fine and does not slow down???? I did not use any thing in V-lab to slow it down, the only thing I did in V-lab is I used a mask in the video for a circle and eveytime I render the video, slows down, plays for a few sec, then it slows down and the video player is moving like it is suppose to, so it is in V-lab when I render the video this problem comes out in the output video.... Thanks, Chad
Posted: Wed, 22nd Jun 2011, 3:28pm

Post 2 of 8

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Uncompressed is an editing format, it isn't designed to be played back directly. If you import the clip back into your video editor, and play it there, does it play correctly, or is the timing still weird?

It sounds like parts of the video are playing correctly, and other parts seem slower, is that correct? When it slows, does it actually go into like a slow motion effect, or does it just glitch, and hang for a second on one frame before jumping ahead a bit, and not playing smoothly?
Posted: Wed, 22nd Jun 2011, 7:53pm

Post 3 of 8

FXhomer57724

Force: 1000 | Joined: 28th Jun 2009 | Posts: 62

VisionLab User

Gold Member

Axeman wrote:

Uncompressed is an editing format, it isn't designed to be played back directly. If you import the clip back into your video editor, and play it there, does it play correctly, or is the timing still weird?

It sounds like parts of the video are playing correctly, and other parts seem slower, is that correct? When it slows, does it actually go into like a slow motion effect, or does it just glitch, and hang for a second on one frame before jumping ahead a bit, and not playing smoothly?
The video before V-lab plays great it is a non comptressed video. I put it in V-lab and I can go through with the key frames and the video works fine! The I put a circle mask on it. The use the uncompress avi file. When I play it back on Real play or window media player the video acts slow then takes off, the status bar on the player is moving right through with no problem, so it is in V-lab that the problem is happening!! Thanks!
Posted: Wed, 22nd Jun 2011, 8:11pm

Post 4 of 8

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Yep, that's almost certainly due to the size of the uncompressed file. Does it play in your video editor, as I asked before?

Render to a different codec, other than uncompressed, and see how the timing looks then.
Posted: Thu, 23rd Jun 2011, 10:56am

Post 5 of 8

FXhomer57724

Force: 1000 | Joined: 28th Jun 2009 | Posts: 62

VisionLab User

Gold Member

Axeman wrote:

Yep, that's almost certainly due to the size of the uncompressed file. Does it play in your video editor, as I asked before?

Render to a different codec, other than uncompressed, and see how the timing looks then.
What you mean exactly when you say video editor? This file is just right out of the camera.. I did put it in Pinnacle studio 12 and it played fine there.... What codec can I use where I will not lose quality?? Thanks!
Posted: Thu, 23rd Jun 2011, 2:40pm

Post 6 of 8

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Something like Pinnacle is exactly what I mean. By video editor, I mean the program you use to edit your video together to make a complete movie. If it plays fine in Pinnacle, this confirms that there isn't any problem. Uncompressed footage is never going to play back smoothly, because it isn't designed for playback.

You use uncompressed during the editing process, when transferring footage from your editor to VisionLab to add effects, then back to your editor, to ensure maximum quality. Once it is all put together in your editor to create the final movie, then you export to a different codec that is designed for playback, like H.264, or mpeg, or something similar.
Posted: Thu, 23rd Jun 2011, 7:59pm

Post 7 of 8

FXhomer57724

Force: 1000 | Joined: 28th Jun 2009 | Posts: 62

VisionLab User

Gold Member

Axeman wrote:

Something like Pinnacle is exactly what I mean. By video editor, I mean the program you use to edit your video together to make a complete movie. If it plays fine in Pinnacle, this confirms that there isn't any problem. Uncompressed footage is never going to play back smoothly, because it isn't designed for playback.

You use uncompressed during the editing process, when transferring footage from your editor to VisionLab to add effects, then back to your editor, to ensure maximum quality. Once it is all put together in your editor to create the final movie, then you export to a different codec that is designed for playback, like H.264, or mpeg, or something similar.
What is the best codec to use for great quality?? I always heard AVI video and I know there is the HD ones, but I dont even have a HD tv.. I filmed a swimming pool change the color, reversed the waves, trying to get that star gate puddle effect and I came close!!
Posted: Thu, 23rd Jun 2011, 9:12pm

Post 8 of 8

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker MacOS User

SuperUser

Absolute best -- Uncompressed. But there are a variety of codecs out there that offer equivalent quality while still offering smaller file sizes.

Personally, I avoid AVI entirely, but some people are happy with it. I stick with Quicktime, which I find to have better compression options, be more reliable, and more stable, but I work on a Mac most of the time. I've heard reports of people having occasional issues with the Windows version of Quicktime, though I've never experienced any myself. I use the Quicktime Animation codec, ProRes, or Apple Intermediate for most editing work, and H.264 for delivery.