Off by one frame with ogg theora "still frames"
Please note that I have not been able to find out the correct term for the "still frames", it is possible that this feature is designated with an entirely different name or description within the Theora development community. For this reason, I'll try to describe "still frames" as well as I can.
In ogg theora videos featuring "still frames", upon which the playback of the video should be "paused" automatically for a given time, VLC pauses at the frame following the "still frame" and not at the "still frame" itself.
This behaviour can for instance be reproduced with the "Patent Absurdity" documentary between position 0:57 and 1:00:
Low quality version http://ia331209.us.archive.org/0/items/Patent_Absurdity/Patent_Absurdity_VLQ_176kbit.ogv
HD video: http://ia331209.us.archive.org/0/items/Patent_Absurdity/Patent_Absurdity_HD_3540kbit.ogv
HD video torrent: http://patentabsurdity.com/Patent_Absurdity_HD_3540kbit.ogv.torrent
The bug can be experienced with both files, however, due to the lower framerate of the low quality version of the video, the actual "still frame" is displayed marginally longer in the low quality version than in the HD version.
Note that the explanatory text flickers up for a fraction of a second during playback, but the video is "paused" only at the following frame which does of course not contain the text anymore.
Just for reference: When the video is played using mplayer instead of VLC/ffplay, the explanatory text is displayed during the entire "still frame".