egosum said:

My home DVD player seems not to recognise AVCHD format, so, I was looking for some software to convert it to something else, preserving two audio tracks and subtitles...

There is no DVD player that is compatible with AVCHD; only BD players could be compatible.

It was not easy, but I found AVStoDVD and ConvertXtoDVD. Both of them are excelent, they convert it to either PAL or NTSC, but the video loses resolution, it goes from 1280x720 to 729x576.

Did you mean 720x576 (as 1280x720 in the title)? It's not possible for a DVD player to play a format with HD resolution; the highest possible resolutions that a DVD player could handle are 720x576 PAL or 720x480 NTSC.

Is it possible to burn it in other way that it is not AVCHD, to check if my DVD player recognises it? I understand that 1280x720 can be passed as HQ, instead of HD, but I don't know of similar software to do this.

No, I'm sorry. The only solutions are to play the AVCHD disc on your computer, or to buy a BD player that is AVCHD compliant, or to use a Playstation 3...