Hi,
why Kdenlive doesnt support AVCHD ? And when it will ?

Which kind of support are you missing? AVCHD (as from Sony CX730) works perfectly fine. Could you be more precise what kind of material you have (ffprobe <avchd-file>), what you try, what you expect and what happens at the end?

I can open in Kdenlive MTS files from my Panasonic camera, but the movement in the movie is very difficult and it makes editing troublesome.
My computer is HP ProBook 2520, core i5, 4GB RAM and Ubuntu Mate 15.04 64bit.

Ah... Yes... Seeking is difficult in AVCHD. You should enable proxy clips in your project settings. Then kdenlive will create a low res clone of your clips for editing. If you render, the original HD clips will be used. See: https://userbase.kde.org/Kdenlive/Manua ... roxy_Clips

OK.
Thank you for your answer.

Hello,

New high bit rate videos are very difficult to read. Even with 8Gb ram like I have, avchd files are hard to read. They do not even read in video reader (not speaking to kdenlive) with the expected fluidity.

This do not prevent editing them. It's a bit more difficult, but I do it all the day

using proxy clip is only possible if you have much time to wait for proxies being done... I don't

jdd

In my experience, Ubuntu support for AVCHD files is embarrassingly bad. To be honest I'm having a great deal of trouble even converting them to a workable format.

With Xubuntu 15.04 an encoded MTS file looks like this: http://youtu.be/l6HcKNbrW_I

People here have suggested I switch distros but that's a big step to try and solve just one problem.

I am sceptical that a distro change would change this at all.

I believe that support for this format comes from the libavcodec-extra-52 package. And you will probably get a very similar version of this no matter what distro you install.