[Libav-user] Specific usage of "Volume" filter

[adev dev]

I am trying to change volume in the specific way in AAC file. So far as I
know "volume" filter allows to change volume on the whole AAC file. What I
need is to change volume only on part of file. To be specific, let say I
have AAC file which is one minute long:
1. I want to set volume 0.5 in the file starting from time 5s till 15s.
2. Then I need set volume 0.8 starting from time 35s till 50s.

Is it possible to implement it in the code with FFMPEG "Volume" filter? Is
it possible to execute points 1 and 2 at one go?
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