Blu-ray DVD movie with a BDMV folder structure, and in this folder there are files with.In this folder, there is a Stream subfolder, which contains a MTS file inside. Blu-ray movie with BDMV & CERTIFICATE folder.mts/m2ts file extension from HD camcorders. AVCHD folders (BDMV and CERTIFICATE) with.The surely-supported BDMV files are as follows: It’s contained in BDMV format, which is a modified format of MPEG-2 stream. To better understand the BDMV file conversion, please read what is BDMV first. Do I first need to create a mountable BR disc image (like an ISO of a DVD)? If so, can someone suggest a freeware or shareware app for this?” Knowledge for BDMV files I’d like to know how I can create an MKV video file from it, if that’s possible. “How to convert BDMV to MKV? I have a BDMV folder on my hard drive from a Blu-Ray disc.