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Distortion Problem on Sansa

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cpchan:

--- Quote from: linuxstb on June 04, 2007, 09:27:40 AM ---"Real Audio" is just a container format and can contain one of many codecs, ranging in quality from very poor to lossless:
--- End quote ---

Ah, thanks, I didn't know RA is just a container format. I had bad experiences with some of their earlier stuff. Now this looks interesting for lossy:

raac: MPEG-4 LC-AAC (RealAudio 9)
racp: MPEG-4 HE-AAC (RealAudio 10)

Do you know how the encoder conpare to Apple's and Nero's?

Charles

cpchan:

--- Quote from: Llorean on June 04, 2007, 02:34:49 PM ---Well the thing is, if we're producing distorted output, then 1) It should show up on RMAA tests, and 2) We need to fix it. Can you provide more information?

--- End quote ---

I am on a trip right now. I will compare it to the lossless source when I get home on Wed. and report back.

Charles

Llorean:
Are you using a lossless file?

Vortex:

--- Quote ---,the real audio codec is like an improvement of the wma codec,I had my sound library in dap as wma files,but now I converted my sansa into a rhapsody one and I converted all my files to real audio
--- End quote ---
That way you don't have any quality gain, rather the opposite.


--- Quote ---real audio codec is like an improvement to the wma codec,but in another way as container,if you use a 128kbps encoded wma the equivalent to that file in wma is the real audio at 160kbps,almost same size.
--- End quote ---
Well, in what way would the Real Audio codec be better than wma when you have to use a higher bitrate to achieve the same quality? You don't seem to make any sense to me, sorry.


--- Quote ---What about distortion,may someone explain me on what consists that?
--- End quote ---
It basically sounds like someone stood to close to the microphone during recording. That way, "s" sounds will be too loud and therefore distort.
The "problem" here is that those files sound play perfectly fine on the Computer/some other device but on the Sansa it distorts.


--- Quote ---Do you know how the encoder conpare to Apple's and Nero's?
--- End quote ---
I would rather use Ogg/Vorbis than AAC (if you can).
That's because
a) Vorbis is OpenSource
b) it achieves better quality at low bitrates than AAC. That's what I have read at least (I don't have the link anymore, but it was said by some guy who conducted listening tests as well as a technical audio analysis with different codecs). The AAC tracks in some HD test videos I have downloaded from the web didn't sound too great either, but that might be the fault of mplayer's AAC decoder.


--- Quote ---Are you using a lossless file?
--- End quote ---
No, I have encoded all my files to Vorbis on the Sansa.

Llorean:
The exact same file plays without distortion on the PC?

Can you provide a sample clip, maybe 3 or 4 seconds that very clearly shows this problem?

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