Hi Mylenium. Thanks for your thoughts which are probably correct for MPEG encoding, except that in my case I'm rendering a Quick Time YUV 8 bit 4:2:2 1080 x 1920 movie. It doesn't matter whether it's with or without audio.

Mark

Re the source footage. In the case of one project they are HDV mpg files, in the other project they are Quick time .mxf files In both case they are the original camera rushes.

The media in both cases is fine having rendered OK when making a test movie from the off -line in PPro. When rendering out in AFX I've tried different drives to render to. It doesn't seem to make a difference to the problem.

It's the random nature of this problem that is so annoying.

M.

Hi Mylenium.

Yes, I know that HDV is a compressed format and that .mxf is just the container for a version of Quick Time that would otherwise not import into AFX (or PPro). I've been rendering away happily with AFX for years now but this is an unusual; random problem that has only just appeared.

M.

Well Bogiesan, just to be clear, this  problem currently appears in two different jobs each one using a different footage type. Some times a glitch appears and sometimes it doesn't.  It is random rather than inexplicable. I can't be confident that when I render, glitches wont appear or where they will appear and is therefore random in nature. I am quite certain there is an explanation for it.

Actually, I don't think it is the footage, but I do think the elimination process you suggest could be helpful. The only problem of course, if I get a clean render, will it be simply because on that occassion the glitches didn't appear (as they often don't) or as a result of the eliminated layer / effect?

This is getting metaphysical!

M.

Bogiesan my dear fellow, I feel like I'm being told off! I know I'm probably a very naughty boy but I normally leave that kind of thing to my mother!

The footage in one of the projects is in fact an up-dated version of a previous AFX film. It has always been fine. I've just up-dated my SC5.5 software and am waiting to see if that improves things.

Watch this space....more news on this channel later!

M.

Hey, no worries. I'm a light hearted chap who enjoys his work, even when technical probs get in the way. Mind you, I've had one or two occassions when I wanted to park my edit suite in the garden.....via the window!

M.

Well, xxtpam.

I really do feel sorry for you. This kind of thing can drive you mad. While I was very grateful for the suggestions offered by everyone, nothing solved the problem. Until that it is, someone from a  company in the UK that have built  edit suites for me in the past suggested reinstalling the operating system. This is a fairly drastic solution because of the inevitable loss of data and having to re instate everything that might be lost in the reinstall.

For me, it was worth it because it worked. I no longer have the glitch problem on that edit suite. For your info, that company is DVC down in Brighton, Sussex.

I should mention that such was the problem, I got them to build me a new edit suite  and moved everything over to that one. It's a big beast of a machine and about as fast as you can get. The "glitch" machine is now "glitch" free but used only as a secondary resource.

Mark