Splitting Line - can this be fixed?

[*inverse*]

I've been rendering a recent project in several different formats (mpeg1, mpeg2, xvid, uncompressed, etc.). In every result I can see this line near the top of the screen that "flickers" and splits the video. It's the most noticable when there's a lot of movement.

Example 1
Example 2
Example 3

I don't think the cause is the source footage, because it's the same type of file I've used many times before. I'm not sure if this is something I can fix, but if anyone has any ideas on how to get rid of it (or to prevent it from happening) I'd appreciate it.

[Zarxrax]

Well the first thing I would say is actually CHECK your source footage to see if the problem is there. Load it up in virtualdub and check those same frames and see if you see the problem in there.

[*inverse*]

I actually used virtualdub to rip the footage - everything played back fine, even after loading those specific clips back in VD. The video itself also plays back nicely inside my editing program - the only time I see those lines is after the video has been rendered. I've even tried playing the video in several different players ^^;

[Zarxrax]

In that case, I've got no idea then. What software are you using for the video? Does the line appear in the same spot every time you render, or in different spots?

[trythil]

I actually used virtualdub to rip the footage - everything played back fine, even after loading those specific clips back in VD. The video itself also plays back nicely inside my editing program - the only time I see those lines is after the video has been rendered. I've even tried playing the video in several different players ^^;

Does the rendered video look alright when you load it into VirtualDub without DirectShow acceleration enabled?

Some video drivers have bugs that cause this behavior.

[trythil]

I actually used virtualdub to rip the footage - everything played back fine, even after loading those specific clips back in VD. The video itself also plays back nicely inside my editing program - the only time I see those lines is after the video has been rendered. I've even tried playing the video in several different players ^^;

Does the rendered video look alright when you load it into VirtualDub without DirectShow acceleration enabled?

Some video drivers have bugs that cause this behavior.

Another example (that I just remembered) can be found in 3D. If you disable vertical sync (i.e. synchronization to the monitor's vertical refresh) in OpenGL or Direct3D applications, then you may get this "tearing" effect as the monitor and video playback updates get out of sync.

This particular cause isn't a bug, just a configuration issue. You may want to investigate both avenues.

[Zarxrax]

Another example (that I just remembered) can be found in 3D. If you disable vertical sync (i.e. synchronization to the monitor's vertical refresh) in OpenGL or Direct3D applications, then you may get this "tearing" effect as the monitor and video playback updates get out of sync.

This particular cause isn't a bug, just a configuration issue. You may want to investigate both avenues.

Thats just a playback issue though. This wouldn't happen on still frames like are depicted... right?

[trythil]

Another example (that I just remembered) can be found in 3D. If you disable vertical sync (i.e. synchronization to the monitor's vertical refresh) in OpenGL or Direct3D applications, then you may get this "tearing" effect as the monitor and video playback updates get out of sync.

This particular cause isn't a bug, just a configuration issue. You may want to investigate both avenues.

Thats just a playback issue though. This wouldn't happen on still frames like are depicted... right?

I dunno. I was just giving an example.

[*inverse*]

Thanks for your help - I'll keep playing around with it