2021-02-03, 00:07
The "MultiView_Layout" line is probably the easiest one to check - that makes it clear that your file is in Side by Side format (i.e. both images compressed into a single frame).
But we've gone off on a rather long digression, here. The important point is that if you correctly repackage a 3D ISO into MKV format, that process is lossless - you aren't changing the video data at all, merely the container. So converting to MKV (correctly) will make no difference whatever to the video quality; but it will work around your long-pause-when-searching problem, and also save a little hard drive space too.
But we've gone off on a rather long digression, here. The important point is that if you correctly repackage a 3D ISO into MKV format, that process is lossless - you aren't changing the video data at all, merely the container. So converting to MKV (correctly) will make no difference whatever to the video quality; but it will work around your long-pause-when-searching problem, and also save a little hard drive space too.