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Author Topic: OGG decoding performance on Nano  (Read 2030 times)

Offline Ararat

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OGG decoding performance on Nano
« on: March 07, 2007, 09:41:32 AM »
Well, i was about to convert a couple of CD's i got, to OGG format, to test if it's quality is better than the MP3 format.
And I realized, that I may get some trouble playing this files on my Rockboxed iPod.

Are there any quality flaws, or low performance of the overall Nano system?
Maybe I'm not explaining myself too well, for example, ¿Am I going to have crashes, or quicker battery drains, if i use this format?

Bonus question: ¿Should i do this, i mean, start using OGG instead of MP3?

Thanks in advance
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Offline Lear

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Re: OGG decoding performance on Nano
« Reply #1 on: March 07, 2007, 10:19:30 AM »
Ogg generally requires a bit more CPU to decode, so the battery can drain a little faster. Other than that, I'm not aware of any significant problems - at least if you use "reasonable" quality settings, like no more than 6 or perhaps 7. If you go higher, Rockbox might not be able to decode it fast enough to keep up (higher bit-rate files are slower to decode).
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Offline mightybrick

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Re: OGG decoding performance on Nano
« Reply #2 on: March 07, 2007, 10:58:10 AM »
Quote from: Ararat on March 07, 2007, 09:41:32 AM
Well, i was about to convert a couple of CD's i got, to OGG format, to test if it's quality is better than the MP3 format.
And I realized, that I may get some trouble playing this files on my Rockboxed iPod.

Are there any quality flaws, or low performance of the overall Nano system?
Maybe I'm not explaining myself too well, for example, ¿Am I going to have crashes, or quicker battery drains, if i use this format?

Bonus question: ¿Should i do this, i mean, start using OGG instead of MP3?

Thanks in advance
I rip all my CDs to ogg vorbis (aoTuV tuned) -q4.  The sound quality is excellent (in my opinion), and the smaller files let me hold more music on my Nano!
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Offline saratoga

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Re: OGG decoding performance on Nano
« Reply #3 on: March 07, 2007, 11:19:31 AM »
Ogg is one of the faster lossy formats on the Ipods.  You shouldn't have any trouble with it.
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Offline Farpenoodle

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Re: OGG decoding performance on Nano
« Reply #4 on: March 07, 2007, 01:31:21 PM »
It's actually faster than the MP3 decoder.

I recently made a battery life comparison of the four major codecs that you can use. (Well MPC isn't exactly major but it's what I use sooo.)

http://www.rockbox.org/twiki/bin/view/Main/IpodRuntime

I'd highly recommend it.
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Offline soap

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Re: OGG decoding performance on Nano
« Reply #5 on: March 07, 2007, 06:07:52 PM »
Quote from: Farpenoodle on March 07, 2007, 01:31:21 PM
It's actually faster than the MP3 decoder.

I recently made a battery life comparison of the four major codecs that you can use. (Well MPC isn't exactly major but it's what I use sooo.)

http://www.rockbox.org/twiki/bin/view/Main/IpodRuntime

I'd highly recommend it.

I would argue the 3 percent runtime difference you saw was well within the margin of error, as I routinely get larger variations than that when duplicating tests.
Though I do applaud you, Farpenoodle, for running a matched series of runtime tests.  Actual data as compared to the vast majority of the "hey, when I use W, X, and Y, my runtime is Z!" ones on the wiki.
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Offline David Marsh

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Re: OGG decoding performance on Nano
« Reply #6 on: March 08, 2007, 12:52:30 PM »
I've taken the rash decision to re-rip all my CDs to ogg format because the quality is great and the files are smaller, meaning more tracks :)  I'm using an iPod Video though, so I'm not sure if it has a fast CPU or anything, but it sounds just fine when I play.
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