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filter output #23

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@jjgordon7109

Not an issue, but a request. Your library is very nice, elegant, thanks for providing! Background: I compiled FFmpeg 4.2.2 using msys2 / gcc7.3.0. I compiled ffmpeg-cpp into a DLL using Qt and gcc7.3.0. Examples I have compiled are working well. I am interested in audio filters. I have started with the filtering_audio example. How do I get the output of each filter? For example, loudnorm uses a 2-pass approach (see http://k.ylo.ph/2016/04/04/loudnorm.html), where you parse the output of the first pass, and use those parameters in the second. Would appreciate if you can provide guidance.

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