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List:       mythtv-dev
Subject:    Re: [mythtv] Choppy performance on Mac Intel builds / scaling issue?
From:       Nigel Pearson <nigel () ind ! tansu ! com ! au>
Date:       2006-03-27 5:21:04
Message-ID: 58a27aad0e7c97559f3ed59f8f87b4e4 () ind ! tansu ! com ! au
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	In my limited experience, "surges"
are usually caused by the CPU not being able
to fill/empty the videoout buffer in time.


> 26.5%	26.5%	QuickTimeComponents YUV422_UC_ToRGB32BitColorBGRA

	That one should be hardware assisted
Don't know why it isn't in this case.

> 18.7%	18.7%	mythtv	non_vec_yuv420_2vuy(unsigned
> 		char*, unsigned char*, unsigned char*, unsigned char*,
> 		int, int, int, int, int)

	That is the primitive YUV420 -> YUV422,
whose whole purpose is to massage the data
into a format that the hardware-assisted
QuickTime routine can deal with.



	Other simple things to check:

1) Deinterlacing. This can often cause

2) Try different playback synchronisation methods

3) Network latency.
Shouldn't be an issue in MMX vs non-MMX though

--
Nigel Pearson, nigel@ind.tansu.com.au | "Gentlemen,
Telstra Net. Eng., Sydney, Australia  |  you can't fight in here
Office: 9814 4803    Fax:  9814 4897  |  - this is the war room!"
Mobile: 0408 664435  Home: 9792 6998  |      Dr Strangelove

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