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#1 |
Member
Join Date: Mar 2005
Location: Oslo, Norway
Posts: 5
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First of all I want to thank the developers for all the work placed into Musepack.
Imo its the best lossy encoder out there! ![]() But I am disappointed with the encoding speed I get with the encoder for Mac OS X. When I encode using the latest mppenc (1.15u) --standard I only get ~2.6x speed. Really not sure if the encoder use AltiVec optimization, or if there are other ways to make it faster? (I know how to optimize using " ./configure > make", but not through Xcode as this software use). Any hints are highly welcome! :idea: By the way, I am running Mac OS 10.3.8 on a PowerBook G4 1.5GHz with 1GB ram. |
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#2 |
Senior Member
Join Date: Aug 2004
Location: Emeryville, CA
Posts: 52
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Musepack currently isn't optimized at all for PPC, so it will be slower.
I'm a little surprised that it's that slow on a 1.5Ghz machine. You built the binaries yourself? |
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#3 |
Member
Join Date: Mar 2005
Location: Oslo, Norway
Posts: 5
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Yes I compiled the binary myself, from the 1.15u source code (since, afaik, there are no official Mac OS X binary for download).
Is it possible for me to use some optimization flags when I compile though Xcode? Something like "-O3 -faltivec -mcpu=7450 -mtune=7450" |
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#4 | |
Senior Member
Join Date: Aug 2004
Location: Emeryville, CA
Posts: 52
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#5 |
Member
Join Date: Mar 2005
Location: Oslo, Norway
Posts: 5
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kuniklo, great that you're looking into it.
I've done some testing myself and found something strange. The encoding speed of 1.15u is only ~half of the 1.15s speed! :shock: mppenc 1.15s: Code:
100.0 197.7 kbps 5.17x 4:22.7 4:22.7 0:50.8 0:50.8 Code:
100.0 185.8 kbps 2.79x 4:22.7 4:22.7 1:34.1 1:34.1 I dont know what changed between the two versions, but it certainly slow down the encoding process a LOT! ![]() Note! I've compiled 1.15s with these compiler flags "-fast -faltivec -mcpu=7450" and the resulting binary run a little bit faster. Code:
100.0 197.7 kbps 5.42x 4:22.7 4:22.7 0:48.4 0:48.4 |
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#6 |
Member
Join Date: Mar 2005
Posts: 3
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Is there any Mac binaries for the more recent release of the mpc codec?
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#7 | |
Senior Member
Join Date: Aug 2004
Location: Emeryville, CA
Posts: 52
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