Support and General Use > Audio Playback, Database and Playlists
AACplus/HE-AAC playback on Ipod 5G Video
saratoga:
Don't quote those SoundExpert tests. They're completely worthless.
TexasRockbox:
For compression I used Sony's ATRAC (including ATRAC 3Plus) for so many years and was amazed that anything resembling music could be recorded and played back (and that was with ATRAC 1!) with it. I recorded a lot of live shows using that format. All subjective, of course, but MP3 just sort of dissapoints me. I'm sure there is room for continual development. It now appears that ATRAC (Minidisc) is finally breathing its last -- not a bad run, almost fifteen years. Vorbis had impressed me with some early tests but for portable use only had a buggy iriver IMP-550 that would play it. The Archos AV500 is a fine piece of equipment and has some enormous capability but is CODEC challenged, in my view. No Vorbis happiness there. Rockbox has finally allowed me to use a player that will allow some large storage and a wide choice of audio CODECs. I'm very happy with the Rockbox 5G system -- a nice balance between the comfort of a "tested" hardware and the excitement of a "cutting edge" firmware.
Chronon:
I encoded the sample file from the CodecPerformanceComparison wiki page into HE-AAC at several different bitrates ranging from approximately 63 kbps to 128 kbps. It looks like it decodes the slowest out of all the codecs I tested, but the Gigabeat still manages around 220% of real-time. Visit the wiki page for the complete results.
Gamesoul Master:
Wow... yeah... that most definitely means that the iPod could not even come close to HE-ACC playback (not even at
Llorean:
Actually, according to the official numbers a 67mhz ARM core can play back certain bitrates of HE-AAC, though it was ARM9 I believe, and doesn't specify if that's running only the decoder or if that's the minimum expected to be needed in a device.
As once we're running dual core we might have a single 80mhz ARM7 core sitting around for decoding, it might be possible for some bitrates of HE-AAC to be realtime on iPod, though by no means is this any guarantee or promise until both testing and optimization have been done. They'll of course be lower bitrates, but once you reach 128kbps or so, there's much much less advantage to these types of formats anyway.
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