How to normalize audio when downloading video (not extract mp3)

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I would like to use youtube-dl to download video’s, normalizing the audio in the process. I understand how to extract an MP3 from the video stream and normalize that, but I would like to have the Video and normalized audio in the container. It seams plausible this could be accomplished during the download, I just don’t know how. If not, it seems like it would be easy to incorporate. The reason this is needed is for downloading recordings of conference sessions, such as Blackhat 2016 briefings, and Defcon sessions. They tend to have microphone volumes all over the place, and when the mic is handed off to someone else you get the hell scared out of your because it’s so loud. Help would be greatly appreciated. I’m posting this on behalf of myself, and 3 others in need of the same process. Thank you for your time.

[markuman]

in ffmpeg it’s -filter:a loudnorm.

So it would be cool to have something like youtube-dl --prefer-ffmpeg --normalize

[mbehm]

I noticed there’s an option to supply extra parameters to the postprocessor so you can do the normalization easily with --prefer-ffmpeg --postprocessor-args "-filter:a loudnorm"