How to keep Blender from adding frame numbers to output filename? When you render something, Blender will automatically append the frame number to all output files' names, producing filenames something like render_0001.png, render_0002.png, render_0003.png, etc.

For frames of an animation this is great, since it keeps the same file from being overwritten for each frame.  But for videos this is usually unnecessary.  Is there a way to keep Blender from adding the frame number to every render output file?
Simply put test.mp4 as the ouput not just test without the file extension.