Non-standard default orientation for lissajous in avectorscope
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Summary of the bug: In the current git-master version of the avectorscope filter the
lissajous mode is shifted 45 degrees in the wrong direction compared to standard audio lissajous scopes.
With a mono source and the output set to
lissajous_xy, the output conforms to what one would expect to see on an audio vectorscope (a diagonal line rising from left to right), however in the default
lissajous mode, a mono signal registers as a horizontal line rather than a vertical line as is expected. This effectively means that in default settings the filter is always erroneously indicating that in-phase audio is perfectly out of phase.
How to reproduce:
ffplay -f lavfi "sine=400,avectorscope=m=lissajous" ffmpeg version N-45798-gb3b3a3e built on 2018-04-17