Audio conversion from mono to stereo

[vcmohan]

I have some video clips taken with Samsung minDV Camcorder in dv1 format and some with Sony digital camera DSC7 in mpg format.
From videodub file information I get
Samsung records in NTSC 29.97 fps,720X480 frame stereo 32000hz 16 bit pcm
Sony records in NTSC, 640X480 frame 25fps mono 32000hz 16 bit pcm (in mpg format)
While trying to join these clips I ran into this problem. Using the example given in the manual I have used the following script
<code>
DirectShowSource("E:\MayJune07\Mov00128.MPG")
converttoYUY2().AssumeFPS ( "ntsc_round_video",false)
AddBorders(40,0,40,0)

audio = last.killvideo()

stereo = MergeChannels(audio, audio)
return AudioDub(last, stereo)
</code>
In the output I get 32000Hz
but the pitch is high.
How do I match these clips with correct pitch?

[scharfis_brain]

please provide an unprocessed sample clip of each camera.

I almost think what's going on here.
Sony's 25fps mode is a fake-mode that introduces heavy frame dropping.