Why not my laptop can't to pronounce the sound,but flash player can?

why not my laptop can't to pronounce the sound,but flash player can?
my app VLC can't make sound,but firefox by flash player can make sound ~~
sorry  my english not wil   *_*!
#lsmod | grep "snd_.*"                                      [0]
snd_hda_codec_hdmi     24487  1
snd_hda_codec_conexant    47158  1
snd_hda_intel          26180  0
snd_hda_codec          98033  3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep               6300  1 snd_hda_codec
snd_pcm                75167  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc          7217  2 snd_pcm,snd_hda_intel
snd_timer              18934  1 snd_pcm
snd                    59989  7 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_hda_codec,snd_hda_intel
#alsamixer                                                  [0]
cannot open mixer: 无效的参数

VLC plugs directly into pulseaudio, while the firefox flash plugin uses ALSA to play sound.  Do you have the pulseaudio-alsa package installed?
I have had a similar problem before.  Sound would occasionally be controlled by ALSA and occasionally be controlled by pulse (the pulseaudio-alsa package did nothing).  As far as symptoms, sometimes other applications would not produce sound while a flash video was playing and vice versa.  Ultimately, I just removed everything pulse/ALSA-related, deleted (and backed up) my configuration files, and installed all related packages anew.  It works now.  I still don't really know what the problem was.

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