Rockbox General > Rockbox General Discussion

Clip+ and AAC

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OzziePants:
I was just wondering where I could find playback time information with respect to codec for the Clip+.

I assume since AAC is more complicated than MP3, the playback time would be less.

Also, would HE AAC playback drain the batteries more than AAC?

Actually, I guess I should check if the Clip+ and do 100% playback speed, I guess.

saratoga:
Should be about the same for AAC and MP3, but probably worse for AAC+ since its a lot slower.

FWIW at the moment we don't have frequency scaling working on the clip+, so the difference won't be huge.  Once it goes in, MP3 and AAC will improve a lot more then AAC+.

OzziePants:
That's fine. I doubt I'll be using HE AAC for music anyway. I mostly use it for audiobooks that I rip. I don't use Speex since it isn't as widely supported. Either way, great to hear AAC and MP3 are about the same.

saratoga:
I've updated benchmarks for the Clipv2/Clip+ here showing how much CPU time each format needs:

http://www.rockbox.org/wiki/CodecPerformanceComparison#AMS_AS3525v2_w_24MHz_PClK_ARM926

OzziePants:
Have I mentioned that I think you guys are awesome?

Because you guys are.

One question though.

On the last column for: Nero AAC-HE

64kaache.m4a    155.54% realtime    Decode time - 113.16s    154.30MHz

I assume that's the CPU speed required for 100% realtime playback, correct?

The CPU goes up to 240 MHz, right?

Would that means there isn't really a risk of damage/overheating/other problems playing back AAC+ files?

Only concern is that battery drain would be way higher, correct?

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