I don't know about SMK, but I guess it could be the video equal to the RAW, based on your description.
RAW is anyways raw data (the extension can be used for several things, but what I've seen most of is for audio).
It is basically
only the essential data, without any "inneccessary" things such as notes, labels, etc. extra data.
For a RAW audio file, it is the sample data, and does not contain the RIFF header or (as I recall) the settings for the audio file, which must be known beforehand in order to actually play back the file.
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