mp4 problem?

[Twirlybox]

OK, I know there are a lot post regarding this question. Yet, i have been super unsuccessful fulfilling my goal.
If someone can give me a definite guide and answer. I would appreciate it.

I want to use mp4 (not convert to avi, mp4!) in virtualdub.
I can convert it, but it loses its clarity and i don't want that.
I want to use mp4 then add subtitles, not turn mp4 into avi and then use subtitles..

If someone can give me a step by step guide. Some of the post have the answers, but I can't follow the computer lingos. I don't even know what "root" folder is.
So if you could please help me out , i would greatly be appreciated. (more detailed the better)

sincerely,

twirlybox

[Baldrick]

You can use YAMB to add subs in a mp4.

But I guess you want burned in subs in the video? Then you can use for example ipodme or if you want more control use avidemux or xvid4psp, see https://forum.videohelp.com/topic360276.html

[Twirlybox]

I'm currently using xvid4psp like you suggested. but i want to upload for youtube. is it the right program?

I set the xvid4psp and when i saved to avi, the file is no where to be found. any suggestions?