EQ eats CPU when processing silence

shpongloid · 19th August 2003, 20:03

Here's a good one (I ran across it while listening to Pimpf by Depeche Mode which contains a large silent part towards the end):

Repro:

Environment: WinAmp 2.91 (tested to not happen on WinAmp3)
Source file: digital silence (as in, every sample is [0,0])
EQ: turned on, with non-flat settings - the more of the sliders are off-center, the worse it gets.

Symptom:
On my lowly machine (P3-450), feeding digital silence into the EQ makes it eat pretty much all CPU that I have (95%+ as shown by TaskInfo). As soon as a non-zero signal resumes, CPU usage drops back to the usual 20..25%.

It doesn't matter whether you have the "silence" out of an Ogg Vorbis file (as I did in the beginning) or an uncompressed WAV (as I did to verify that it still happens). Didn't try silent MP3.

I don't think you need a sample to show the problem, a file with all silence is easy enough to generate

I attached 20 seconds of ogged silence just in case, along with the EQ settings that I was using.

Thanks,
shp

bmezenga · 5th September 2003, 05:07

I´ve searched on forums. These two thread are similar to yours.
http://forums.winamp.com/showthread....87#post1037987
http://forums.winamp.com/showthread....036#post929036

Unfortunatelly they didn´t provide a solution.

But this shouldn´t least longer.
See Ogg Trafic from August 20, 2003:
"Now that the Neuros work is finally out of the way, Monty's plans for the immediate future include a Vorbis 1.0.1 bugfix release, which is planned for early September"

Even if the problem isn´t related to vorbis libraries, the plugin developer may consider to debbug this when compilling the new libraries.

shpongloid · 11th September 2003, 21:08

Thanks, bmezenga, for the reply. I searched as well (but obviously not as well as you did, since I didn't find anything)...

I believe they are indeed the same bug, but unlike the other posts who seem to point to the Ogg Vorbis input plugin, I am positive it is actually in the core WinAmp code, in the equalizer.

It happens with .mp3, .ogg and .wav (tried those three myself), and I'm sure with anything other format as well.

Right now I just resorted to turning off the EQ (or not listening to silence

It'd be nice if it would get fixed, though...

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5th September 2003, 05:07	#2
bmezenga Member Join Date: Mar 2002 Location: Brazil Posts: 75	I´ve searched on forums. These two thread are similar to yours. http://forums.winamp.com/showthread....87#post1037987 http://forums.winamp.com/showthread....036#post929036 Unfortunatelly they didn´t provide a solution. But this shouldn´t least longer. See Ogg Trafic from August 20, 2003: "Now that the Neuros work is finally out of the way, Monty's plans for the immediate future include a Vorbis 1.0.1 bugfix release, which is planned for early September" Even if the problem isn´t related to vorbis libraries, the plugin developer may consider to debbug this when compilling the new libraries.

11th September 2003, 21:08	#3
shpongloid Junior Member Join Date: Aug 2003 Posts: 2	Thanks, bmezenga, for the reply. I searched as well (but obviously not as well as you did, since I didn't find anything)... I believe they are indeed the same bug, but unlike the other posts who seem to point to the Ogg Vorbis input plugin, I am positive it is actually in the core WinAmp code, in the equalizer. It happens with .mp3, .ogg and .wav (tried those three myself), and I'm sure with anything other format as well. Right now I just resorted to turning off the EQ (or not listening to silence It'd be nice if it would get fixed, though...