REIKA wrote:WMV files use "windows media metadata" which is the same as the tag of WMA.
MP4 files use "iTunes tag" which is the same as the tag of M4A.
AVI files use "RIFF tag" which is the same as the tag of WAVE.
OGM files use "vorbis comment" which is the same as the tag of Ogg Vorbis.
MPG files use "ID3 tag" which is the same as the tag of MP3.

Therefore I think it is easy to be enable ReplayGain in these formats.
For example, dBpower Music Converter can save ReplayGain values in WMV and MP4 video files.

I don't know about MKV, RM, FLV and others.

Dreadlau wrote:

Lowlander wrote:I would love to see this if it is possible.

Same here.

There is a lot of variation in volume among my videos. :/

btw: It would be nice if mediamonkey could implement aacgain.
see: http://altosdesign.com/aacgain/

Lowlander wrote:I would love to see this if it is possible.

Since you want to edit the audio, the video has got nothing to do with it.
There are two ways, one is lossless, the other is lossy. The lossless way can be done only if you have a mp3, aac or lossless format stream. Other audio formats will have to be done in a lossy way.

Firstly, you will have to extract the audio (demux). This can be done with a varying amount of tools, depending on the container. Better you tell us what formats you want to deal with.

Second, the extracted audio file must be replaygained with foobar2000.
-or-
The lossless way for mp3 or aac: Run mp3gain or aacgain. You can skip the third step.

Third, convert the replaygained file with foobar and tell it to recognize the replaygain, so the adjustment is encoded in the file.

Fourth, mux it with the video stream. Here you have again various choices of tools for the container format. If you only have AVIs VirtualDub(Mod) is all you need.