how can i normalise the volume of a mp4 file which is a combined file

[sumeshkri]

i joined two mp4 files with ultra video joiner. i got these videos from different sources. now the joined file is playing well but the problem is with the volume. the first part is having a comparatively high vol and the second part less. how can i normalise the volume of the combined file?

[Baldrick]

Open the mp4 in goldwave or audacity. Normalize. Save as aac or mp3. Add the new track to the mp4 with yamb.

[sumeshkri]

baldrick,
may i ask you
when we open the mp4 in audocity and export as mp3 we will get a n mp3 file.ok. then our original mp4 will remain a sit is.then you suggest to open the mp4 in yamb and mux with the new audocity made mp3. then what happens to the original mp4 with the low volume ?my qtn is do we need to demux before the new audocity-made audio to the mp4?if so how can we achieve this. sorry i am new to yamb. thanks.

[Baldrick]

Try! Maybe would MyMP4Box GUI easier to use.

[sumeshkri]

audocity is not opening my mp4 file!