Matroska x264 seek issues

Hi,

I'm attempting to mux an x264 video file encoded with mplayer, using the 
mkvtoolnix program mkvmerge v1.7.0 on linux. Everything works fine 
throughout all the steps, up until the video is muxed into an mkv file.

Basically, once the movie is muxed, it plays fine, everything is in 
synch, _but_ the on screen position bar in mplayer is incorrect. No 
matter where I seek to, fast forward or rewind, the OSD reads out that 
the movies is at position 0%. I can fast forward, skip ahead, etc, but 
the OSD position meter in mplayer remains unchanged.

At first I thought this was only a problem with mplayer, but when I play 
the file in VLC media player, a similar problem appears. Again the movie 
played fine, but VLC displayed no seek bar, and was also unable to fast 
forward the movie.

I can only assume that some kind of time code stamps or the like have 
been changed or made unreadable somehow by mkvmerge.

I encode the video, then mux it into an mp4 file using mp4box. Up to 
this point there are no problems. I can still seek fine(the OSD position 
bar appears, and will fill up as I seek further.) It is only once the 
video is muxed into an mkv file that the seek issue becomes a problem.

I've tried multiple encoder settings for this, but nothing seems to 
work. Does anyone know what might be going wrong?
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