Audio unusable in video import

[jkoseattle]

I am transferring old VHS tapes to .mp4 files. It sounds fine in the app when ripping, but I'm getting strange results when opening in CW. Also, during playback the audio is heard twice, about a second apart, creating an echo effect. Does anyone recognize what's going on here?

FWIW I also tried importing the video into Camtasia, and while the audio sounds fine (not doubled), I am not seeing any waveform information. 

Exporting audio out of Camtasia and then opening the resulting audio file in Adobe Audition shows the same strange waveforms but this time no sound at all. 

[Promidi]

There are many variants of MP4 files.  Maybe this is just one of those variants that Cakewalk can’t deal with properly.

One thing you might want to try is to use a video converter to recode the resultant MP4 file after the rip.

Another possibility is that the MP4 might have a variable bit rate. If that's the case, try converting the MP4 to a constant bit rate rather than variable.