ffdshow -> Info & Debug * should show the resolution of the stream you input, the assumed pixel dimensions (SAR) and the resulting horizontal/vertical ratio (DAR).
SAR 1/1 means pixels are square shaped. Any other value means that the image must be scaled (resampled) during display as it is in most cases impossible to change pixel ratio.
If Info & Debug shows "XVID" as the input FourCC, it is the real resolution of your file. If the fourCC is an uncompressed type such as "YV12" or "DIB*" it could mean that another filter that resizes the picture is active (unlikely).
Have you tried to play completely different unrelated Matroska files?
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