Rockbox General > Rockbox General Discussion

Re: AAC-HE Playback bug

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saratoga:
AAC had a lot of work done after 2010, but MP3 didn't change too much after that. 

ThaCrip:

--- Quote from: saratoga on October 12, 2017, 10:41:55 PM ---AAC had a lot of work done after 2010, but MP3 didn't change too much after that.

--- End quote ---

so in other words... MP3 and AAC-LC are probably similar enough in terms of how many Mhz it takes to decode(?). assuming that's true, then it should not matter whether i use MP3 or AAC in terms of battery life.

Thanks for the info.

p.s. who knows, maybe ill charge up the e250 soon and let it run for 12 hours or so and then see where the battery levels are as that should give me a general idea on it's battery life as i figure it should be able to at least pull off that much without the battery being empty.

Bilgus:
Don't ASSuME run a battery bench with a 10 or so AAC files and another with mp3s

ThaCrip:

--- Quote from: Bilgus on October 14, 2017, 03:01:43 AM ---Don't ASSuME run a battery bench with a 10 or so AAC files and another with mp3s

--- End quote ---

I might just do that soon enough as while it's harder on the battery to drain them to empty i figure a couple of cycles won't hurt that much and can give a general idea on how a recent version of Rockbox is with MP3 and AAC for battery life especially since it was mentioned in here that AAC received quite a few tweaks since 2010 but MP3 pretty much stayed the same.

it's been years since i last ran a 'battery bench' in Rockbox but i want to say it was something in the 15-20hour range from full (well i should say 95% or so since apparently Rockbox does not actually charge a battery to 100%(which i think was done for battery longevity reasons)) to empty.

but if i get around to testing that soon enough, ill likely make a quick reply in this topic for future reference for others to see. but when i do run the test ill be using Apple AAC @ 128kbps (TVBR mode) when i test it and then run a test on LAME v2(190kbps average) encoded ones. ill use the same music CD for both.

p.s. i heard as a general guideline you don't want to run re-chargeable lithium batteries lower than about 20% of your battery left before re-charging otherwise it can noticeably shorten their overall life span, especially if your commonly doing that.

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