[Vorbis] -q and -m/-M fail on some files

[Nic Watson]

I appreciate that -q is supposed to work with -m and -M now.  It works
on most files.  Here is a pathological case that doesn't:  a 30 second
sine wave in stereo.

Using libVorbis v1.1.1,

$ oggenc -q3 -m 96 sinewav.wav
Enabling bitrate management engine
Opening with wav module: WAV file reader
Encoding "sinewav.wav" to
         "sinewav.ogg"
at quality level 3.00 using constrained VBR (min 96 kbps, no max)
Failed to set bitrate min/max in quality mode

(It does not encode the file)

The hard limit encodes, but fails to set the limit:
$ oggenc -q3 --managed --advanced-encode-option bitrate_hard_min=96
sinewav.wav

Enabling bitrate management engine
Opening with wav module: WAV file reader
Encoding "sinewav.wav" to
         "sinewav.ogg"
at quality level 3.00 using constrained VBR (no min or max)
Setting advanced encoder option "bitrate_hard_min" to 96
Failed to set advanced rate management parameters
        [ 99.2%] [ 0m00s remaining] \

Done encoding file "sinewav.ogg"

        File length:  0m 30.0s
        Elapsed time: 0m 01.8s
        Rate:         16.3755
        Average bitrate: 13.3 kb/s

I'm happy to send a link (in private) to the .wav file.

Nic Watson