i download a video in an .mp4 format and when i tryed to play i got a message that says that that format is not supported, the video its ok, i played it from my pc, i want to know where i can get more video codecs, i already downloaded the codeck pack and the kmmplayer and nothing

I posted in the main Movie thread what to do. There are certain specifics in the MP4 container that need to be correct for it to play (similar to PS3, PSP).

What type of Video and Audio codecs does the MP4 use? Remember the MP4 must be streamable (i.e., H264 video therefore) whether you are streaming it or storing it locally.