The file is apparently a recording from a Bosch DIVAR DVR-5000-16A000. Specification claims that this system records "H.264, 16-channel Video, 4-channel Audio". The user who uploaded the sample added the following text: I am having the same issue with *.dxa files to any other format. This is also a security video and ffmpeg will not convert it. Can you please let me know what I am doing wrong? This has always worked great for me on other files... josh at edmundsonlawfirm.com