Anamorphic encode rv9 convert mkv doesn't play

i just tried the latest mkvmerge tool instead of Dark-Cracker's directshow wrapper, and it seems to create a 'good' anamorphic RV9 file. the atest.mkv file, as created by DC's dshow wrapper:

Sirber: Are you sure you are using the latest muxer? Could you check the version number at the file properies in explorer? karl_lillevold: mkvmerge's demuxer may not recognize those double packed frame types, try to compare the frame listing of rmeditor with what you get in the codec through the dshow filter.

MatroskaMuxer.ax: 1.0.0.6 subtitlesource.ax: 1.0.0.1

so I did check, and the mkvmerge'd file has a large number of missing frames, most likely as a result of the demuxer problem Gabest mentioned. This means most files converted from rmvb to mkv using mkvmerge will have missing frames, so this is not a recommended method until this problem is fixed in mkvmerge's demuxer.