All over the map and you are possibly breaking their rules about downloads. But how to normalize the video will require a lot of work. You could get a better video editor which you will find no one really teaches about. Support is also rare.
But let me share how I might normalize the audio. I'd strip the audio out of the video and head to AUDACITY to adjust the audio to a certain level. Now I can splice that audio track back into the video.
This is not an offer to write exact step by step tutorials. Just the basic what I would be doing. I have used many tools over the years like Audacity, VLC Player, various video editors and it seems that no one tool or editor gets the job done all in one app.
The other thing working against you is the end of the DVD. Even I don't make video DVDs anymore. I just put the file on the disc or USB stick and leave it at that.
Need to know how to create DVDs that will play all burned segments at the same volume.
Windows 7 64 bit on HP p6710f desktop. Using Any Video Converter ( AVC )
version 6.3.1. Copying video from YouTube, converting to NTSC video, and attempting to burn to DVD on DVD-R discs. When produced, the content plays with wild inconsistency. Some vids play normally. Others are incredibly loud, or incredibly soft. Many produce a loud strange buzzing sound that I associate with a cheap speaker turned up too loud. I've tried contacting AVC support, but they are extremely slow to respond. The files that are malfunctioning are too large to attach to my email, even when zipped. I tried uninstalling and reinstalling AVC. I have tried playing the burned DVDs on both a stand alone DVD player and television, and on the DVD player and Windows Media Player 12. Both result in this distortion. I have tried many different Audio settings both when downloading and when burning, nothing helps. Currently settings under Tools>Audio are Audio Volume>Volume Control: set at 0 db. (trying to change this does nothing to change the audio ). I have selected Volume Normalize. (whether on or off, this will not work.
AAC parameters: MPEG TYPE: MPEG-2, Object Type: Main, MPD parameters: Encode: CBR, VBR Quality: 4-Middle, MPD Volume: Default, Audio Quality: 0-Best.
Nothing I do will change any of the bad results.
Specific videos that "buzz" and are too loud:
All from YouTube:
The Hidden War over Grocery Shelf
The 2008 Financial Crisis
This file BLASTS on too loud when played on burned DVD:
This next file Tends to be Okay, not great but not buzzy:
History of Ideas Capitalism