I'm replacing a DVM/HD with a DVM-8400. Will the same videos play in the DVM-8400 without conversion?
Most likely. In addition to several other formats, the DVM-8400 plays MPEG2 Transport Streams (just like the DVM/HD). There are only two cases where the files would not play as expected. First, the bitrate of the videos must not exceed 40Mbps. The DVM/HD supported a maximum bitrate of 50Mbps, so this is a possibility. The second thing only applies if you are using the analog outputs of the DVM/HD and the video files have 2-channel Dolby Digital audio. The DVM-8400 will only output Dolby bitstream formats from the Digital Audio connector, so the analog outputs will be silent.