Rockbox General > Rockbox General Discussion

Ipod battery. Only 1 hour?

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Sepharat:
Hi. I have installed rockbox in a 60gb ipod and have stored 30gb of ogg music in it. I´m using a theme I think it uses more resources than the first one but i´m not sure if it´s normal that i can use the ipod only for an hour. And when the ipod is full recharged, when i start it, the battery shows that there is a small part of it used, is it normal? Another thing, this normal I think, is that when i´m playing a song, the ipod becomes more slowly. I have read the problem is that the ogg codec is not optimised but i don´t know where i have to read to know news about this part of the project
Thank you and congratulations to the developers for this great work

soap:
Only getting one hour of battery life would be VERY unusual  What kind of battery life do you get in the original Apple firmware?  You should get ~50% of that number when using Rockbox.  Are you sure your battery was fully charged?  

Upon startup, my iPod also shows a small part of the battery as used, even when fully charged.  This is normal (for now).

The music playback thread gets CPU priority over the user interface thread.  Compound that with the slow scrolling speed on the iPod video, and you get very sluggish scrolling while playing a song.

Sepharat:
I don´t know how much time i can use my ipod with Apple firmware because i installed rockbox to be able to listen my ogg music when i bought it. I will make a test tomorrow to know it. Do you know how much time is the normal battery life in this model of ipod? And do you know if there is any developer who is working in the ogg codec to extend battery life?
Thanks

Seraph:
i'm no coder, but i doubt improving the codec will do any good.
From what i understand, Rockbox currently uses the IPOD's main processor (ARM) to do the decoding (hence the sluggish scrolling while playing) and not the chip apple put in there to decode audio.
The ARM slurps up your battery like crazy.

dan_a:

--- Quote from: Seraph on December 23, 2006, 11:31:18 AM ---i'm no coder, but i doubt improving the codec will do any good.
From what i understand, Rockbox currently uses the IPOD's main processor (ARM) to do the decoding (hence the sluggish scrolling while playing) and not the chip apple put in there to decode audio.
The ARM slurps up your battery like crazy.

--- End quote ---
That is incorrect.

The iPod Video has a special chip (made by Broadcom) to do video decoding, but no hardware audio decoder.

Improving the codec will improve battery life.  When the ARM is idle we can reduce the clock speed which uses less battery, and if we have more optimised codecs then the ARM is idle more.

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