Hello all. Can anyone help me with the following problem please? When I download an .mkv file from a website via IE9 (e.g. a filesharing site,) and then try to mux it into an .m2ts file via tsMuxeR GUI 1.10.6, I get the error message Matroska parse error: Invalid EBML number size 0 at pos 1791543839. The number at the end is different depending on the file itself. It usually happens at around 99.8%. However, when I download the same .mkv file via torrent, I can always succesfully mux it to .m2ts with tsMuxeR. This has happened with many different files I have downloaded directly through the browser. Any ideas why this happens and how I can make my browser downloads work correctly? Not all files I want are available on torrent sites. Thanks in advance. EDIT: This is not referring to any illegal files.