Mix audio to video changing volume of both video and audio FFMpeg -


mix audio video changing volume of both video , audio

i want reduce volume of (audio in video 0.5 times original)

and change

volume of second audio files (2 times original)

i refering command 

ffmpeg -i video.webm -i audio.oga -filter_complex \ "[0:a][1:a]amerge=inputs=2[a]" \ -map 0:v -map "[a]" -c:v copy -c:a libvorbis -ac 2 -shortest out.webm

from how add new audio (not mixing) video using ffmpeg?

also dont have libvorbis, how can use same codec of video new file


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