[FFmpeg-trac] #7145(avfilter:new): Non-standard default orientation for lissajous in avectorscope
FFmpeg
trac at avcodec.org
Wed Apr 18 02:52:27 EEST 2018
#7145: Non-standard default orientation for lissajous in avectorscope
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Reporter: privatezero | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: git-
Keywords: | master
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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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
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/7145>
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