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AAC 320 VBR question
SpyGuy
post Nov 16 2012, 01:07
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I'm looking at buying a new head unit for my car, a Kenwood Excelon KDC-X896. According to the specs it can handle AAC-LC format from 8-320KBPS.

Here's my question. I'm using Foobar2000 to convert my lossless songs into VBR AAC at q 0.76 which is roughly 300KBPS. The thing with VBR though, is that it swings, on tough passages it might go as high as 340 or maybe even more.

So here's my question. On devices that say they can handle 320 VBR, do these spikes show up as pops or artifacts, are they just not played back for that millisecond? Do I need to find a q setting low enough so that any spikes stay below 320? Or by saying that it can handle 320 VBR, Kenwood is saying it can handle any spikes at 320 (which can go as high as nearly 380 according to some googling I do).

Apparently iPods have this same specification, 8-320kbps VBR, but I'll have to get my hands on one to see how they handle it.
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Porcus
post Nov 16 2012, 11:33
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Is there any essential difference between AAC at average 320 but transient higher reported rate, and MP3 at 320 but with optimized use of bit-reservoir, or does it really boil down to reporting by the software?


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SpyGuy
post Nov 16 2012, 21:53
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I spent some time last night reading up on qaac and then configuring it with Foobar. Its a nice little encoder and I like the TVBR aspect. I got a hold of my brother's iPod and it does indeed play VBR above 320, I encoded a half a dozen songs at V -127 which gives bit rates in the 350+ range, and the iPod had no problems. Makes me feel good that this Kenwood unit might have the same performance. If not, I think going down to a lower bit rate won't be a big deal. Thanks for the heads up on qaac.
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