FFmpeg/libavfilter
Marton Balint 084ef7d7d5 avfilter/af_pan: reject expressions referencing the same channel multiple times
Fixes parsing of expressions like c0=c0+c0 or c0=c0|c0=c1.  Previously no
error was thrown and for input channels, only the last gain factor was used,
for output channels the source channel gains were combined.

Signed-off-by: Marton Balint <cus@passwd.hu>
2018-03-29 00:07:39 +02:00
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