I thank you Jerry for your help.
I finally managed to solve the problem and I think it didn’t have to do with VLC, my yesterday diagnosis was wrong: I had just arrived from India: not enough sleep.
The problem was that the GH2 generates several files and in two of them (CLIPINF and STREAM) the content was not coincident. I can’t explain why, but it must have to do with me having sent to trash some clips after visualising in VLC. I found the missing parts in trash, fortunately, but I faced a second problem – some of the clips showed with their name changed, can’t understand why, either. I corrected those names and bingo!
Regards,
Carlos Ribas Monteiro