Adobe Connect 9.5 onwards, the option to convert recordings to MP4 format is available. The conversion to MP4 format happens directly on the user's machine and there is no server-side queuing. The offline conversion option is similar to the previously available option to create offline recordings in FLV format. A few settings allow you to control the quality and hence the size of the final output file.
The actual resolution of the output MP4 file depends on the screen size and the supported resolution of the machine used to create the offline recording.