Hi Otto,
You're not the first needing to do this.
While I don't have any personal experience with converting .MTS files, the FREE audio/video converter I use, called MediaCoder, does do this conversion; and here is a link to this question on their forum. http://forum.mediacoderhq.com/viewtopic.php?f=17&t=5891
The download link is http://mediacoder.sourceforge.net/download.htm, be sure NOT to get any of the other software offered on that page by mistake, they have a number of Google ads there.
Depending on the CPU of your PC, there may be optimization packs that can speed up the conversion process. Look close to the bottom of the page under "Additional Downloads". This program WILL use multiple cores if the CPU has them; and it's free. I like free as long as there are no strings attached like spyware and such nonsense.
You're not the first needing to do this.
While I don't have any personal experience with converting .MTS files, the FREE audio/video converter I use, called MediaCoder, does do this conversion; and here is a link to this question on their forum. http://forum.mediacoderhq.com/viewtopic.php?f=17&t=5891
The download link is http://mediacoder.sourceforge.net/download.htm, be sure NOT to get any of the other software offered on that page by mistake, they have a number of Google ads there.
Depending on the CPU of your PC, there may be optimization packs that can speed up the conversion process. Look close to the bottom of the page under "Additional Downloads". This program WILL use multiple cores if the CPU has them; and it's free. I like free as long as there are no strings attached like spyware and such nonsense.