unfortunetely the issue
https://roundup.ffmpeg.org/issue814 (choppy playback of rv30 and rv40 video)
has been removed from FFmeg bug tracking system.
the closest I found is this
https://trac.ffmpeg.org/ticket/364 (Workaround for RV40 timestamps)
the video sample provided with the VLC ticket (https://trac.videolan.org/vlc/ticket/3738) does not even play on my system VLC 2.1.0 x64 on Windows 7 x64 !