I have been using blender for a few years and this is the first time I have come across this problem. I am running 2.79 on Ubuntu. I was trying render a short test video for a new project and I came across this error on the top of my blender feed.
"Could not open file for writing"
And occasionally I get the error "Python: RENDER_MT_presets"
There is a triangle caution sign on the left of it. I am trying to write to the same folder of my last 6 videos. I found several videos just saying that I need to change the output source, but that didn't work. I also found this post on the forum. Deleted .dvd file, and "Could not open file for writing." I tried changing the permission for the folder, but again it had no effect. I am now confused by this and am hoping that someone could help.