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Old 08-12-2008, 12:40 PM
larrytxeast larrytxeast is offline
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Default AAC and Ogg Vorbis with e280

I have a Rockboxed'd Sansa e280 v1 with an 8G microSDHC card (giving me 16G of space total obviously). I have been fooling around a little bit with AAC as an alternative format, as well as Ogg Vorbis. What I have done so far is rip the "Green Day, Insomniac" CD to WAV format (using CDEx), then used a converter (from http://www.koyotesoft.com/indexEn.html) for converting to the formats. A couple of questions:

(1) I can't upload either AAC or Ogg Vorbis files to the device, I assume this is because the SanDisk firmware is used for uploading, correct? I assume that to get the songs on there I would use a card reader for the MicroSDHC card and then (if I wish) use the File Browser in Rockbox on the device to move the songs to the device itself? (Or would they have to reside on the card still due to the incompatibility?)

(2) In converting the WAV files to AAC, I noticed it gave the option for MPEG2 or MPEG4. I used MPEG2 and used the 128k average bitrate setting (not a numberic quality setting). Are those the appropriate settings to use? The Ogg Vorbis I converted to 96k bit rate, did not use VBR or quality parameters beside the 96k bit rate.

Do those settings seem proper?

As for the MP3 format, I converted the WAV files to 192k MP3 files for what it's worth (and did not use the VBR option as I did not know what other options within that choice were best, so I left it off), Also with that particular CD I still have the original WAV files in case you posters suggest some other type of settings with the conversions would've been better. I'm all ears.

I do hear some things about Rockbox having issues with AAC files at times, they recommend Ogg Vorbis or WMA (or MP3) instead. I had intended to use the AAC files on the e280 since the 128k files would be smaller than the 192k MP3 files, and maybe use the 96k Ogg Vorbis files on a Sansa Clip (with the firmware update) if I ever got one of those.

Tips?

(By the way, all of this makes me wonder if the way to acquire future music is to, instead of using Amazon or Rhapsody, to instead acquire the CD itself and rip to WAV, that way I can use 192k MP3s instead of 256k MP3s since they sound fine to me and avoid any degrading that would come from converting Amazon 256k MP3s to that size, same with conversion to AAC or Ogg Vorbis--whereas the WAV rips from the CD I'd be able to do all that. In essence, more trouble initially, but better ultimately.)
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  #2  
Old 08-12-2008, 01:15 PM
kugel's Avatar
kugel kugel is offline
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Why can't you put AAC or Vorbis files on your Sansa? I've never had problems with that.

For the settings, I'd highly recommend to NOT use a fixed bitrate setting (this applies to all codecs). I use q3 for Vorbis, which is meant to yield ~110kbit/s on average. I stopped using AAC since Vorbis is at least as good and, more important, free. Also, AAC is a bit complicated, since there exist several profiles and this mpeg2/4 (which I never happened to know what to pick) issue you talked about.

Most important, Vorbis is more battery friendly than MP3 and AAC.
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Old 08-12-2008, 01:22 PM
saratoga saratoga is offline
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Quote:
Originally Posted by larrytxeast View Post

(1) I can't upload either AAC or Ogg Vorbis files to the device, I assume this is because the SanDisk firmware is used for uploading, correct?
Sounds like you've still got the player in MTP mode. Switch it to MSC and then you can upload anything.

Quote:
Originally Posted by larrytxeast View Post
(2) In converting the WAV files to AAC, I noticed it gave the option for MPEG2 or MPEG4. I used MPEG2 and used the 128k average bitrate setting (not a numberic quality setting). Are those the appropriate settings to use?
MPEG2 and MPEG4 both contain AAC specifications, but that doesn't really say anything about the resulting file. What encoder and what settings did you feed it? Hopefully not FAAC . . .

Quote:
Originally Posted by larrytxeast View Post
Do those settings seem proper?
Probably not, but this isn't a rockbox question. Go look on Hydrogenaudio or where ever if you really want to know about good encoder settings.

Quote:
Originally Posted by larrytxeast View Post
I do hear some things about Rockbox having issues with AAC files at times, they recommend Ogg Vorbis or WMA (or MP3) instead. I had intended to use the AAC files on the e280 since the 128k files would be smaller than the 192k MP3 files, and maybe use the 96k Ogg Vorbis files on a Sansa Clip (with the firmware update) if I ever got one of those.
The main issue with AAC is poor battery life. I've committed the first improvements this week, with more to follow eventually. Assuming you pick an ok encoder, you shouldn't have too many other issues. iTunes is pretty safe in this regard.

I'd probably use Vorbis though. Rockbox support is much better and the decoder is already quite fast.
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