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
Linked issues
Comments 8
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...
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.
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...)