I was doing some reading and found this…
“AVCHD is formatted for burning onto a Blu-ray Disk (BD) or even a dual-layer DVD (DVD-DL). This version usually downloads as a .ISO file (often with a .MDS file included). Not all soundtracks and subtitles are included in this version due to BD limitations. See this article to learn how to “mount” the .ISO file on Windows, Mac, or Linux.”I’d like the MKV with all the features and audio, but if you convert this to AVCHD, it won’t lose the additional commentaries and stuff like that ? No loss of quality ?
AVCHD is a Blu-Ray burned to a DVD9, more or less. Converting the MKV to an 8GB AVCHD will lose quality. Just convert it to a BD25 and burn it to a single-layer Blu-Ray, then you won’t lose quality. Otherwise just download the AVCHD version and burn that to a dual-layer DVD (though it will only play in a Blu-Ray player).