Slow encoding on Mac OS X

krmathis · 12 March 2005, 08:51 pm

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.

kuniklo · 16 March 2005, 12:29 am

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?

krmathis · 16 March 2005, 11:31 am

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"

kuniklo · 16 March 2005, 04:12 pm

Quote:

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"

We're not sure which compiler flags are appropriate for the mac build, although I'm working on it now. mppenc seems to be somewhat sensitive to compiler optimizations so be careful.

krmathis · 16 March 2005, 07:44 pm

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

mppenc 1.15u:

Code:

100.0  185.8 kbps  2.79x     4:22.7    4:22.7     1:34.1    1:34.1

Both compiled with standard configuration, no additional compiler flags.
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

Pretzel · 25 March 2005, 01:27 am

Is there any Mac binaries for the more recent release of the mpc codec?

kuniklo · 25 March 2005, 02:10 am

Quote:

Is there any Mac binaries for the more recent release of the mpc codec?

I'm working on them but I've been pretty busy with some other stuff for the last week or two. Hopefully soon.

12 March 2005, 08:51 pm	#1
krmathis Member Join Date: Mar 2005 Location: Oslo, Norway Posts: 5	Slow encoding on Mac OS X 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.

16 March 2005, 07:44 pm	#5
krmathis Member Join Date: Mar 2005 Location: Oslo, Norway Posts: 5	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 mppenc 1.15u: Code: 100.0 185.8 kbps 2.79x 4:22.7 4:22.7 1:34.1 1:34.1 Both compiled with standard configuration, no additional compiler flags. 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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to install on MAC OS X	guaren	MPC for UNIX	7	31 July 2007 07:00 pm
test release of new gui mpc player for the mac	kuniklo	MPC for UNIX	4	20 March 2005 07:54 am
getting musepack-tools building on the mac again	kuniklo	Development	15	03 January 2005 11:49 pm
Encoding and Decoding works fine -- but how to PLAY it???	AndreasG	MPC for UNIX	2	27 December 2004 07:14 pm
HowTo for Mac users	JaiPerduMaMuse	MPC for UNIX	2	09 December 2004 09:33 pm

16 March 2005, 12:29 am	#2
kuniklo Senior Member Join Date: Aug 2004 Location: Emeryville, CA Posts: 52	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?

16 March 2005, 11:31 am	#3
krmathis Member Join Date: Mar 2005 Location: Oslo, Norway Posts: 5	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"

25 March 2005, 01:27 am	#6
Pretzel Member Join Date: Mar 2005 Posts: 3	Is there any Mac binaries for the more recent release of the mpc codec?