When I started the game with the snapshot 14w34d (and some versions after that snapshot) the game cannot start minecraft and the launcher say this:
Game ended with bad state (exit code -1073741819)
I cannot play at any snapshot of 1.8
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I have 1 GB allocated to minecraft and doesn't work

Try, while you get a new better response, to go to %appdata% and move your .minecraft folder to other folder and download a clean version.
If now it works just close the game and copy your saves and screenshot folders to the new .minecraft and enjoy the new versions...

I will try that thx


Yes... It works now.
I think it might be because I have a modded .minecraft

Modded content is not to be discussed on this bug tracker. Also, once you use a mod and have problems with using it you can't report it here. Only report bugs in unmodded versions of Minecraft. I deem this bug report Invalid.

So sorry for the invalid bug 😞
Maybe you put more memory than you have? (In that case put less, 2GB if you have 4GB, for example) (In JVM arguments at the profile editor...)