9c render hanging at split boundary

TeetimeNC wrote on 1/3/2010, 7:33 PM
THE SCENARIO
Hopefully someone can help me figure this out. I have a 9c AVCHD project. I have a number of places where I have split a video event and moved the right hand side of the split straight down to a lower track so the split edges remain adjacent in time. Then I set track motion and pan/crop key frames at the beginning of the right hand event.

AS AN ASIDE
I'm doing this to allow me to pan and zoom across a grid of video events and maintain full resolution when I am zoomed into a single event.

THE PROBLEM
On a few of these, when I try to render a small loop region that surrounds the split, the render will freeze exactly at the first frame of the right hand side of the split. If I try to cancel the render I get a message that Vegas has a background task running. The only way out is to 9c with the task manager.

I also have 9c 64 bit installed but it has been even less stable with AVCHD.

MY SYSTEM
I am running on a fast i7 quad with 6GB ram. In Vegas I have max threads set to 1 and preview ram to 64MB. I have ensured that quantisize to frames is ON.

Any ideas?

Jerry

Comments

ushere wrote on 1/3/2010, 8:49 PM
i would never dream of trying anything like that, or even avchd on my t/l!

try converting to a more editable format - either uncompressed, or in my case, mxf.

good luck

leslie
farss wrote on 1/3/2010, 9:21 PM
Zoom ALL the way in and make certain your frames are really aligned with frame boundaries.
Sometime ago I submitted a bug report showing that Vegas has a cumulative error in how it calculates frame lengths. The only error I could see it causing was the wrong frame being displayed but I didn't persue all possible implications of the problem. SCS are aware of the issue but it would be good if you had a look see if it had further implications.

Bob.
TeetimeNC wrote on 1/4/2010, 4:24 AM
Good suggestion Bob. I checked this morning and it was properly aligned on frame boundaries. For grins I then tried another preview render across the split, and of course it worked perfectly ;-). This makes me suspect it was a temporary cache file that was causing the problem. Something that got deleted between last night's attempts and this morning. But who knows.

Jerry

Zoom ALL the way in and make certain your frames are really aligned with frame boundaries
farss wrote on 1/4/2010, 4:32 AM
Thanks for checking that out, as you said "who knows", which I why I like to leave no stone unturned.

Bob.
TeetimeNC wrote on 1/4/2010, 6:22 AM
Ok, I had some other segments freeze during preview renders this morning and I think I now know why. In each case, the freeze appears to be at a particularly intense part of the render.

Although I always do my real renders to a separate render drive, the "preview in player" renders go to the sony temp folder, which on my computer is on the same drive as the program and OS. I respecified the Vegas temp folder to a different drive and the renders are going smoothly.

Which brings me to my next question(s). Is there a way to specify a different location for preview renders independent of the temp folder location? Or, is it better to move the temp off to a drive other than the program/os or render drives (i.e., to a 3rd drive)? I am assuming the later is the better option.

Jerry
TeetimeNC wrote on 1/5/2010, 12:57 PM
i would never dream of trying anything like that, or even avchd on my t/l!

Leslie, you're right of course. I was lulled into thinking this was going to work because it went pretty well up until the last 10% of the project. I was able to deal with the slower previews by doing Shift B around the points of interest. But then Vegas 9c became increasingly unstable, freezing randomly as it turns out.

The good news. I've finished the project thanks to the delightful Vegas "Replace" function in Project Media. After all these years using Vegas this is the first time I've needed to replace large amounts of footage and it worked flawlessly. I first used Production Assistant to batch render my MTSs to MXFs, then replaced all the MTSs in my project.

Jerry