Major synchronizing problem please?

[tendra]

Here what happen,i just downloaded an hour lenght flv video form myspace and try to convert it into avi using anyvideo converter.Before the convertion i have checked the video with mediainfo and added the exact same ammount of frame rate to converter.After the convertion video and sound doesn't match up.Sound is like 3 seconds late.So i used avidemux to syn the sound but the real problem come right there.Even thought the sound match up for 2 minutes of the video rest of them aren't.So i played the oridinal video on kmp player and there is nothing wrong with it except when i put it into avidemux or convert it.Can anyone tell me how to convert it without messing up sound?thanks
Here is the original file info
video stream;vp6
audio stream;mpeg audio (vrsion 2 )

[redwudz]

Usually if the sound gets more out of sync as the video plays, an audio offset is not the problem. Most likely the audio and video lengths are different. You can extract the audio with AVIDemux and adjust the audio length with a program like Audacity, then mux it back in with the video. Check the lengths with MediaInfo. I've no idea how your converter ended up with out of sync audio.

[hech54]

FLV is THE WORST popular video format to "get out of" in the history of mankind. Once something is in FLV format i consider it a total write-off.