hi,

i have one avi video file with one mp3 audio. Now i want to put in another audio (mp3) on the first track.
I don't get it with mencoder or avidemux. Everytime only one audio data sticks.
E.g.: Vid 1 including Aid 1 should become after muxing: Vid 1 with the new audio on track 1 and the original on track 2

Second question is how to change the framerate of the video and the original audio?
E.g.: Vid 1 with Aid 1: Avi @ 23.976 fps with MP3 @ 23.976 should merge with Aid 2 @ 25 fps (MP3) => Result: Vid 1 (25fps) with Aid 2 (on first track) and Aid 1 (25fps)

thanks