topic Re: Walkthrough exports awkward clip transition within avi in Revit Structure Forum

Walkthrough exports awkward clip transition within avi

Anonymous — Sun, 08 Apr 2018 19:14:21 GMT

Hello,

I need some advise. After the compression process, the avi export file contains an awkward transition that I wish to change to the standard keyframed walkthrough instead of the display box growing smaller and bigger mid animation. I attached a video to help depict the issue.

I have tried:

Changing the number of frames.

Changing the frame range.

Changing the frames per second.

Changing the visual style.

Changing the video compression from

Full Frames (Uncompressed) which works the best
Intel IYUV codec (I dont know why two are listed as options but not something better)
Microsoft video 1 (works the worst)

Any advice would be appreciated. Bonus points if you can provide a link to make a gif or export large amounts of photos

Re: Walkthrough exports awkward clip transition within avi

L.Maas — Mon, 09 Apr 2018 08:20:52 GMT

What I have done in the past was to export images from Revit. Then used ffmpeg to stitch the together to a movie.

Advantage is that when rendering fails at some point, you do not have to start from the beginning. And if you need to drop a sequence you can delete the images/frames before stitching the rest together

Re: Walkthrough exports awkward clip transition within avi

dgorsman — Wed, 11 Apr 2018 20:20:46 GMT

Basically, anything other than very short movies are best done rendering to frames and then using other software to post-process them and add them to the video container. The latter is one of the last steps you want to do, as repeatedly compressing/decompressing video content results in poor quality.

Blender can do a number of editing and compositing functions on sequences and video; it uses ffmpeg in the background. There's similar (but better) video editing products from Adobe, Black Magic, and others.

Re: Walkthrough exports awkward clip transition within avi

ovidiu_paunescu — Tue, 17 Apr 2018 09:19:23 GMT

Hello @Anonymous

That's a strange behavior.

You might want to check the camera positioning, size of the view, resolution of the exported video.

I've worked with walkthroughs quite a lot and here are my recommendations:

Use the Full Frames (Uncompressed) setting.
- when using the full frames setting what i do is limit the export to about 300-350 fps so that the avi file is less than 2GB (I'm using camtasia to edit the video and it seems unable to open the files if larger then 2gb)
- For a 900 frames walkthrough 1-300; 301-600; 601-900 then stitch the videos back together
After export, crop the video to the edges (it usually results with a white ban around the frame)
You can export the same walkthrough with different view settings and then transition between the two in editing - really nice effect.