e have lossless modes. a container can be any of the common formats and you put your code(s) inside that, containers include anything from .AVI, .MPEG, .TS (transport stream is a good choice), .VOB, .mov, .qt .WMV* .mkv .asf and more... also dont get the options confused with the profiles levels, for instance keep in mind the Broadcasters would not use anything other than the Main or High Profiles