I have an HD movie that is a .mkv file in x264 format. My HDTV only supports Divx 3.11/4.x/5.1/6.0 xViD H.264 BP/MP/HP MPEG4 SP/ASP Motion JPEG How can I play this file on my TV? I'll need a program to convert it, I assume.
As far as I understand X264 is not a format.X264 is an encoder for creating H264 files. I think your problem is not the video format, but rather the container (MKV). Try muxing to something else (.TS Maybe).
TSmuxer. Make sure to get the FPS right or your audio and video will lose sync. The Process is lossless as there is no re-encoding involved. The file resulting size should be very similar to the original.