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Magnum_ n00b
Joined: 01 Mar 2004 Posts: 61
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Posted: Thu Jan 29, 2009 2:12 pm Post subject: MP3 poor quality |
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Hi,
I'm using my new system a few months now. Lately, I've noticed that the MP3 playback quality is pretty poor.
I'm using ALSA, with the onboard soundcard of the P5Q-E (I'm not in front of my PC rightnow, can't check the exact model), which is connected directly to my Yamaha amplifier + klipsch RF speakers using an optical SPDIF cable. I'm using the unstable kernel 2.6.28, because in previous versions the IEC958 output was not available yet for my soundcard.
I'm playing the MP3 files using Audacious. The sound quality is poor; when you listen closely, there's a noticeable crackling sound which comes from the tweeters. The MP3 files are all high bitrate files; no junk. Ok; MP3 stays a lossy format, but that's not what I'm hearing here. I have to listen closely to notice it, but it's there and it annoys me.
When I'm playing a MKV media file or a DVD with DD or DTS with VLC player, I don't have this problem at all; the sound is crystal clear as it should be.
Do you have any idea what might be causing this, or where I must start looking?
Thank you in advance, |
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Magnum_ n00b
Joined: 01 Mar 2004 Posts: 61
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Posted: Thu Jan 29, 2009 6:04 pm Post subject: |
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Home now, time for some more details :
Code: | Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller |
Code: | default:CARD=Intel
HDA Intel, AD198x Analog
Default Audio Device
front:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
Front speakers
surround40:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Intel,DEV=0
HDA Intel, AD198x Digital
IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=Intel,DEV=0
HDA Intel
HDMI Audio Output
null
Discard all samples (playback) or generate zero samples (capture)
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Mamizou Tux's lil' helper
Joined: 09 May 2003 Posts: 101
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Posted: Fri Jan 30, 2009 5:22 pm Post subject: |
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What's the actual bitrate of the mp3s you're trying to play? Also, do you have Replay Gain enabled in Audacious?
Also, if you're encoding your own music, try using a different compression codec (FLAC for lossless, OGG for lossy, etc.), and see if it does the same thing. |
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micmac l33t
Joined: 28 Nov 2003 Posts: 996
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Posted: Mon Feb 02, 2009 12:38 pm Post subject: |
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Hi,
I think it's a case of low-quality resampling from 44.1 to 48 kHz. Try this: Install alsa-plugins with USE=libsamplerate, then create /etc/asound.conf with the line
Code: | defaults.pcm.rate_converter "samplerate" | Then restart your music player.
Bye |
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