ffMPEG to Combine Backbuffer and ViewportUI ?


I am currently using the new Movie Queue Render, and I am trying to combine the video and the UI, which are generated in a different files.Backbuffer and .ViewportUI. I was looking but I could not find a way to combine them (it’s a pity Movie Queue Render can not do it by itself) So I wonder if anyone knows the format so I can make a nice .mp4 video.

Many, many thanks!

Found the way, just in case, this is a sample:

ffmpeg.exe -y -framerate 30 -start_number 02176 -i “G: est\VideoNumber01\VideoNumber01.%04dBackbuffer.png” -start_number 02176 -i “G: est\VideoNumber01\VideoNumber01.%04dViewportUI.png” -filter_complex “blend=all_mode=‘overlay’:all_opacity=0.2” -c:v libx264 -profile:v high -level 4.2 -r 30 -pix_fmt yuv420p -crf 17 -preset veryslow output.mp4

I found a weird issue with ViewportUI render. I am redering a full HD sequence. The ViewportUI.png file is correct, but all Backbuffer files are cropped! Anyone tried it?

Ok, I found I had to configure the achors like this, if not, the UI will be cropped.