The Mudcat Café TM
Thread #162759   Message #3876186
Posted By: Bonzo3legs
09-Sep-17 - 04:55 PM
Thread Name: Tech: ffmpeg batch process volume increase
Subject: RE: Tech: ffmpeg batch process volume increase
Yes that's fantastic, I included -aq value as 0 which gave me up to about 200kbps. I did a little research on -aq and found mention of
-b:a which seems to be used with a bitrate, so I changed the batch file to include -b:a 320k which now gives output file sizes identical to input files!

So my batch command is now
for %%F in (*.mp3) do ffmpeg -i "%%F" -filter:a "volume=1.5" -b:a 320k "test\%%~nxF"
done

Thanks again for all the help.

Now to prepare a nice loud folder of music for our flight back to London Gatwick tomorrow evening!