Rockbox General > Rockbox General Discussion

Portal Player Battery runtime vs compiler

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Lear:

--- Quote from: tychver on November 03, 2007, 10:59:08 PM ---Just out of interest, which codecs were faster and which were slower?

--- End quote ---

Using some test files at about 192 kbps, it turned out like this:

AAC170%MP3208%Vorbis233%
There's a Wiki page with lost of comparisons like this, but last I checked there were none that used a version of Rockbox that included some recent optimizations to Vorbis.

JeoL:
Just out of curiousity, to what is the information above relative to?

Chronon:
The wiki page he referred to is here: CodecPerformanceComparison

soap:
I think JeoL means what are the percentages of?  They are of realtime, ACC (in this example) runs 170% of realtime, or 1.7X.
Of course playback is done at realtime, but it is nice for the actual decoding to be done as fast as possible.

Llorean:
Well, playback actually requires slightly faster than realtime. Though I don't believe we have an exact number, I think the estimate for iPods is that we need between 120 and 130% realtime to have enough overhead in playback for the UI and everything else to be able to go on, as a minimum.

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