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FS#12754 - Opus decoder fails to play stereo tracks encoded with the "--uncoupled" option
I have some stereo files that need to be encoded as two independent channels with no lossy stereo coupling. I encode these files by passing "--uncoupled" to the Opus encoder, e.g.
opusenc --bitrate 64 --framesize 60 --uncoupled example.wav example.opus
The lossless flac version of a sample of such a file prior to encoding can be downloaded from
If I do not pass the "--uncoupled" option to the encoder, the resulting Opus file plays with no trouble on my Sansa Clip+. The sample of this encoding is at
However, if I pass the "--uncoupled" option, sample at
Rockbox only plays a cacophony of chirps, scratches, squeaks and garbled noise, and no hint of the original sound is detectable.
Note: I have only been able to test this on a Clip+, as I own no other Rockbox player that is capable of playing Opus files at this time. Hopefully someone can confirm this problem on other targets, but for now, I have been able to reproduce it 100% on the Clip+, and I can confidently point to "--uncoupled" as the encoder option that results in an unplayable file.
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