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I am converting videos using ffmpeg. Videos are 1080p at first and I convert 1080p to h264 720p and 360p. Also if videos are 360p I`m converting them to h264 360p. The problem is when converting happens from 1080p to lower formats the sound is really really quiet while 360p to h264 360p are fine and you can hear them without problems on laptop.

I read about program called sox, downloaded it and it just handles .wav files not .mp4 I need.

I could do it ffmpeg -vol option, but there could be noise, while I read that sox calculates the maximum value so there would not be any side effects.

What is the best way to do this? Just a side note Im not that strong on linux, so please dont make it very complicated.

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Can you post the ffmpeg command and its result, to help you? –  d33pika Mar 11 '13 at 6:56
    
If you can just copy the audio data (-acodec copy) then there should be no difference between input and output audio, unless you have audio level metadata that you are not copying (EBU R128 or ReplayGain). –  mark4o Mar 11 '13 at 21:57
    
The problem is in the input files.Have you ever downloded a HD movie? They are almost always much much quiter then standard quality. –  Treat Mar 12 '13 at 21:14

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