You have full control of the conversions (which front ends ffmpeg which does the actual conversion in the background)
From the conversion settings menu select the Configure menu and you will be presented with the Conversions Presets Dialog.
From there select an existing Preset and copy it. You can then change the settings for the conversion as required and save it to a new preset.
Then use your new preset to convert the files you want.
From CRS @ 03 Aug 2017 06:08