Blackmagic Forum

Hello everybody,
I want to seek help for a weird problem.

One sequence causes the render to fail without any known reason.

"DECOR failed at time 0
ERROR: Render failed at Tue 11:07AM! Last frame rendered: 0!"

This is the only msg I get.
Timeline ranges seems aligned ok.

My comp is playing without problem inside fusion and sequence isn't failing at time 0, so why this sequence is problematic at render time?

Thank you in advance for helping.

What format do you load? What format do you write to?
Any retimes in the comp?

Some more information needed to guess

Thank you for your answer.

loaded: exr
output: tiff 16

no retime, but I moved time range of some clips, in the timeline

If there is a tool in your flow that can't get its Background at a given time, it will fail the render. For any clip that does not start at the first frame of your comp, use the Hold First Frame control to extend it to the beginning of the comp. If necessary, you can use a Boolean set to Clear right after to remove the repeating first frame—just animate the Blend control of the Boolean to turn the clip back on at the appropriate time.

Another way to solve this problem (usually) is to Merge your Loader over a Background node. The Background will determine resolution and color depth and ensure that the image is valid at all times, even if the Foreground doesn't exist.

I say "usually" because sometimes the comp will fail anyway on the frame right before the clip starts.

Thank you very much brian.
I understand exactly what you meant here. Makes a lot of sense actually. Very useful.

There are some other rare occasions when render fails when you are trying to render on files that are used by another application simultaneously.

Thank you very much miltos for your info, I'll remember that