E.g. filesize~1G prefers the format with filesize closest to 1 GiB. The fields hasvid and ie_pref are always given highest priority in sorting, irrespective of the user-defined order. This behaviour can be changed by using --format-sort-force. Apart from these, the default order used ...
But you can use some methods to alleviate the asynchrony of time. If you are using your data packets recorded by the ROS system, you can use the system timestamp as the timestamp of the data, so that you can get the data pair with the closest time through the correlation of the ...