VLC low fps playback was always an issue.
Hello,
In case it may help, just tested on my computer the minimum fps working "fluently" with Vlc :
=> 2.5fps or higher is ok (tested with Vlc 2.0.3 and 1.1.11, same results)
=> 2.4fps or lower is erratic or totally static
The tested files were 2 avi files (xvid) whose frame rates were quickly modified using VirtualDub (Change frame rate to...) then saved without reencoding (Direct stream copy)
A workaround could be to record at 4fps, then playback in VLC, altering speed to 0.25x and now the output is exactly 1fps
This workaround is ok with Vlc 1.1.11 (just tested it, each frame appears on each ticking second, great !) but I couldn't do same with Vlc 2.0.3 because the "Slower Speed" in 2.0.3 doesn't seem to correspond to 0.25x found in 1.1.11