Strange horizontal cut in video

Quinine wrote on 5/28/2003, 2:48 PM
I have a project 1/2 finished but I am noticing some "clipping" in certain scenes. I am refering to clipping as a fine horizontal line that comes across the entire screen about a third of the way from the top of the screen and cuts the frame showing part of the picture moved to the left. It is not present in the video until about 15 minutes into the project. I have several different scenes from several avi's but the line seems to come and go.

Even stranger, I rendered the movie twice with the same results but, when I cut off all the frames before the troubled frames in the movie to test the problem voila, the strange clipping stopped! Also if I render just the troubled clips by themselves they come out fine. It is only when I am late into the movie that it starts happening and the results are consistent. What does this mean?

I need the whole movie intact. Why am I getting this effect late in the movie and how can I stop it?

I am actually using Video Factory 2.0c but I heard it and Vegas are similar, and there's not much going on in the VF forum.

Can any one help, This is important.

Thanks

Comments

kameronj wrote on 5/28/2003, 3:47 PM
Use VV and see if you get the same result.

Other than that, if you render the clips by independent of each other - what happens if you use the rendered clips in a new project?

If you are still getting the results...well, let's say this - I would be surprised if you got the same results.

But I would suggest moving on up to VV.
Quinine wrote on 5/28/2003, 4:46 PM
Yeah, that s what I did,

1 I rendered the entire movie and got the clipping

2 I rendered each of the clipping frames seperately and they were fine

3 I then selected all the frames before the first sign of clipping and deleted them and the first clipping frame was fine but the ones after it (many frames after) still got the clipping.

4 Right after I then took out the the first clipping frame and ALL the frames were fine!

This is frustrating because the results only prove that the rendering is inconsistent. I was hoping to find that the clipping frames were corrupted somehow and that I could merely replace them. But seeing them render fine on their own or when one is removed make it a completly ramdom event thought the clipping is consistent when the entire movie is rendered.

Bizzare,

VV, now that I know VV will open VF files I am tempted to upgrade but I certainly dont want the same results.

Anyone have suggestions?

A keep VF2 and find a solution? or
B Buy VV, with no garantee that it will fix the problem?
kameronj wrote on 5/28/2003, 4:52 PM
I think I may have miscommunicated.

When you render clip A...it's fine.
When you render clip B...it's fine.
When you render clip c...it's fine.

When you try and render a file with clips A, B, and C (prior to rendering them separately) you get "clipping".

Have you tried to take the render of A...B...and C...load them in a new project and render those?

Next question - where did you get the original clips from? That is - did they all come from the same source, same encoding, etc. If clip A was a clip you captured from a camcorder and clip B was a clip someone gave you and you encoded to a MPEG (I'm just assuming file types here) and the third clip you found on the internet....then there is no telling what types of codec are running through the files.

Which brings me back to the first thought which is after you render a "good looking" clip A, B and C respectively - then bring those into a project and work with those and see what ya get.

If that is what you already did - I apologize, I just didn't read into far enough. And if that's the case....anyone else have a thought?
Quinine wrote on 5/29/2003, 12:24 AM
Well, I may be miscommunicating as well, let me just address some of what you said.

I think you may be on to something in the acquiring of the clips. The trouble started with lets say frame 100. Frame 100 was a .mov file I created in a program called Starry Night. Frame 200 also clips which is from a DVD which was turned into a .vob which was converted into a .avi in a program called Virtual Dub.

Most of my clips are from different sources. eg. I have clips that were created by using my ATI Radeon to record off of my vcr tape and captured to an .avi. as well as the above. Some were .mpeg's converted into .avi's by a program called RadTools.

I have not tried to add the files into a different project yet. After I saw they rendered fine by themselves I sort of wrote off the idea that they were damaged. I am leaning more to the idea that it could be all the different source material in the video.

BTW I purchased VV and will try to render the project in it first chance I get. I hope it does the trick, if not I guess I will have to consider a unified conversion process for all my .avi's
josaver wrote on 5/29/2003, 3:21 AM
I think is a problem with interlacing.

The conversions to Avi made some artifactcs sometimes. VV can use the mpg directly.

In vegas you can use the vobs directily only changing the extension to mpg. But you have only the video the audio is missing. You can use DVDDecrypter to extract the whole mpg from a DVD (not protected) and use this on vegas. It mantains the interlacing correctly.

Josaver.
Quinine wrote on 5/29/2003, 5:24 PM
Well it looks like VV is going to do it. I loaded my video into the trial and it rendered it just fine. I guess you get what you pay for.

Thanks for the help all.

Q