Quick note to myself about Blender
animations that contain Videos and Scenes.
DO NOT START AT ANY OTHER FRAME THAN 0 !!!
Loaded a 30min video into the Video Sequencer and then created a Scene with animated elements. Added the Scene to the VSE and everything worked well. Started the render going ...
12hrs later the drive ran out of space (19G) and the render stopped. Then I moved everything to a new drive and set the Start frame
to be the "next" frame and set it rendering again.
I noticed that the progress information kept flicking from one value to another for the "current frame". After 6hrs I realised this was rendering the Scene frame well ahead of the video frame.
When you set the Start frame
in a normal Blender
animation that is the frame Blender
starts rendering from. But when you have a VSE setup the video frame matches the Start frame
but the Blender
Scene instead renders frame n+Start frame
The fix, of course, is to make sure the "overwrite" checkbox is cleared and just restart the render from Start frame
checks for the frame file names before it happily continues from Start frame
And this is a reminder to ALWAYS render to PNG/JPEG not MPG/MP4 and then ffmpeg it back to a movie at the end.