MPEG2 produces two files only during the encoding. After the encoding is finished, they are merged into one MPEG file.

The options I used were from the standard MPEG2, only with the bitrate changed and to 2 VBR Scan. I am viewing the clip in WMP on an internal drive, but this has never been a problem before. As I said, this clip is also very short and has no fast scenes. It happens for all MPEG2 video I try to encode.