RIP DVD audio to WAV succeeds - MP3 fails - why?

[klundberg]

Greetings,

My goal is to rip audio from a standard DVD to an MP3 file. Can anyone help me understand why the WAV output file in the example below sounds fine, while the MP3 output file is choppy - alternating subsecond chunks of audio and silence?

WAV command line (audio sounds fine)
vlc dvd://D:@1:1 --sout=#transcode{acodec=fl32,ab=256}:std{access=file,mux=wav,dst=e:\wip\dvd256.wav}

MP3 command line (alternating subsecond chunks of audio and silence)
vlc dvd://D:@1:1 --sout=#transcode{acodec=mp3,ab=128}:std{access=file,mux=dummy,dst=e:\wip\dvd1.mp3}

Thanks in advance,
Ken Lundberg