Support and General Use > Audio Playback, Database and Playlists
most efficient codec on gigabeat
leland:
hi all,
i'm new to rockbox and wondering what codec to transcode my collection into... most of the collection is lossless and i always would put it into ogg for use on my karma, mainly for the size advantage.
i took a battery hit by using ogg, but it wasn't so bad.
now that i have all these wonderful choices, i was wondering if rockbox (on the gigabeat f40, if it matters) is more battery efficient w/ a certain codec.
i was planning to use lame just so i can share w/ friends and they won't whine about it, but could be persuaded to give aac a whirl. anyway, would appreciate hearing what you guys chose and why. thanks!
Llorean:
AAC is a bad, bad idea. The Rockbox version isn't very good, and it wouldn't really offer extra decode efficiency either.
Either go LAME MP3 or Ogg/Vorbis. On the Gigabeat you're probably (though not definitely) going to see equivalent runtimes with the two. MP3 might get you a little more, but since there's no CPU scaling, and our Vorbis is actually fairly optimized on ARM, it's not a certainty.
If you're doing higher bitrates (256kbps range) you might consider Musepack instead, but if you're going higher than 128, or 192, you're probably wasting space anyway. Of course, in the end, you should go with what your ears tell you sounds best (so long as you don't force your subjective results on others :))
saratoga:
Ogg is a really fast format. If you saw a hit on the Karma, that was probably just due to issues on the Karma.
MPC is the fastest lossy format in Rockbox though.
markun:
--- Quote from: saratoga on April 18, 2007, 11:40:58 AM ---MPC is the fastest lossy format in Rockbox though.
--- End quote ---
Don't know if it's faster than AC3 (but nobody probably uses that for CD ripping)
saratoga:
--- Quote from: markun on April 18, 2007, 12:00:19 PM ---
--- Quote from: saratoga on April 18, 2007, 11:40:58 AM ---MPC is the fastest lossy format in Rockbox though.
--- End quote ---
Don't know if it's faster than AC3 (but nobody probably uses that for CD ripping)
--- End quote ---
Should be, unless the AC3 decoder is absolutely amazing. Subband decoders are generally faster then transform decoders.
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