[Ffmpeg-devel] MMX/MMX2 and SSE optimizations for H.264 decoding
Thu Sep 22 22:14:51 CEST 2005
Rich Felker <dalias at aerifal.cx> writes:
> On Thu, Sep 22, 2005 at 10:47:51AM -0700, Loren Merritt wrote:
>> On Thu, 22 Sep 2005, Romain Dolbeau wrote:
>> >Loren Merritt wrote:
>> >>we have:
>> >>we do not have equivalents of:
>> >The additional question is, are we going to be bitten by
>> >Amdahl's Law ? i.e. are these important enought during
>> >the decoding process to justify optimizing them ?
>> idct is not so important (iirc 3% total speedup when I mmxed it).
>> qpel_4 matters only on videos that use 4x4 motion partitions.
>> qpel_8 and loop_filter are important.
> IMO loop filter is irrelevant because everyone who cares about
> performance disables it. :)
I though you cared about image quality. Disabling the loop filter
degrades the image.
mru at inprovide.com
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