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View Full Version : L-R Channel Swap Issue



Mike Reeve
2004-09-03, 12:38
Hi Sean

I prepared two versions of 'my favourite track' from 'my favourite CD' :-O
[i.e. Spoken Channel Identification from the HiFi News & Record Review Test
CD],
one an AIFF the other a MP3.

I made a playlist containing the two versions and put it on repeat ...
.... and listened to 25 repeats of the cycle AIFF + MP3, not once but twice!

[After two times 30 mins of that if I wasn't crazy before I could be now!
:-O]

BTW before each test I restarted both SlimServer & the Squeezebox.

For the MP3 version the L & R channels were always correct.

With the AIFF version the channels randomly swapped :-(

Below is a trace of each 25 cycle sequence for the AIFF version,
with "Y" meaning that the L & R channels were the correct way round
and "N" meaning that they were swapped ...

Y,N,Y,Y,N,Y,N,N,Y,Y,N,N,N,N,N,N,N,N,Y,N,N,Y,Y,N,N

Y,N,N,N,N,Y,N,Y,Y,Y,N,Y,N,N,Y,Y,Y,Y,N,N,Y,Y,N,N,Y

I'm not convinced that it is only related to my particular Squeezebox
(unless it really is a marginal timing issue),
as, if my memory serves me well, we first identified this bug
in the single-digit & teen versions of the firmware (when many people heard
it)
but by the end of the 20s (after your fixes) I don't recall hearing it on my
Squeezebox.

However, it does seem to have reappeared with a vengence in the 30s ...

[And while I have been typing this I notice from the discuss list
that Phillip Kerman has heard it also ...]

Michel (Fombellida): Any occurrences in either of your two systems ...?

Regards

Mike

Michel Fombellida
2004-09-03, 12:49
Hi Mike,

> Michel (Fombellida): Any occurrences in either of your two systems ...?

I just tried a few times with one of my SB (FW35) and the channels were
correct. In my setup it has been while that I did not notice the channel swap.

I'll check again soon in my other system.

Cheers,
Michel