Martin Steghöfer wrote:
However, the issue happens even after transcoding the speex file to ogg vorbis (using audacity).
This assessment was based and on a file mix-up in my testing process and is wrong. The issue is speex-specific.
The problem occurs with speex files that declare 2 channels in the header, but don't provide any in-band stereo signal before the first sample. As far as I can see, the speex standard allows this, it is never even mentioned that any in-band stereo signal has to be sent at all. So ogg123 should be able to handle this case.
However, the initialization of the stereo information data structure in ogg123 doesn't happen until the first in-band stereo signal is received. For all samples before the first stereo signal, the stereo information data structure is used in an uninitialized state and therefore produces distortions/noise/silence.
The patch in git commit fb82b1de29 fixes the problem by using the proper libspeex functions for handling the life cycle of the stereo information data structure.
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