Cann't play many audio files!

[chenvc]

I compiled the vlc-0.8.1 source with the following command in RedHat9.0:
./configure --prefix=/usr --with-ffmpeg-tree=/home/src/ffmpeg-20041113 --enable-debug --enable-esd --enable-alsa --enable-arts
make

I use it to play files(.dat, .mpg, .vob, .avi) and it can play, but it some time have audio some time have no audio:

[00000316] mpeg_audio decoder: MPGA channels:2 samperate:44100 bitrate:128
[00000276] main audio output error: couldn't find a filter for the conversion
[00000276] main audio output error: couldn't set an input pipeline

[00000272] a52 decoder: A/52 channels:6 samplerate:48000 bitrate:384000
No accelerated IMDCT transform found

but I compile the vlc-0.7.2 and can play the files with audio.