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Subject: Re: Iriver "bleeding" mp2 48kHz buffering problems

Re: Iriver "bleeding" mp2 48kHz buffering problems

From: Thom Johansen <thomj_at_pvv.ntnu.no>
Date: 2005-06-27

Martin Borus wrote:
> Tried this:
> When I'm in there, even the 128k file
> the "PCM:" bar hits zero quite often and bar never exeeds the first 10%.
> It goes max to the ":" of "PCM:"
>
> With the 192k file it's the same. "PCM:" goes to zero every few seconds.
> The "codec" bar displays negativ values sometimes.
>
> Could the large files be the problem? Both files are larger than from
> 160 - 240 MB in size.

Thanks, this is very helpful indeed. Your problem seems to come in two
parts:
1. The MP2 decoder is quite simply just too slow. It's even slower than
the MP3 decoder, which is really strange, since they share much of the
same code. I have disabled the dithering as a temporary measure, and
this really sped things up, so you SHOULD at least not have gaps
in your audio anymore.
Things should improve in this area as we optimise more, the resampler
too is very slow, and will see improvement.

2. The negative codec buffer bar is another problem entirely, I think,
and I currently have no idea what's causing this.

Thom

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Received on Mon Jun 27 20:10:13 2005


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