How to add a soundtrack to a movie without affecting the quality of the movie

I would like to add a sound file with a Polish teacher to the film "Your Vincent" or, if you prefer, "Your Vincent". Google is full of such instructions, but then the quality of the film deteriorates and from 3 GB to 9 GB, and what is worse is blurry image. How to do it without interfering with codecs and format.

How to enlarge a little so that the left and right edges reach the end of the screen. There is a function in the player to bring it closer but I would like to save such changes in the movie so that it plays without a combination in full screen

Which program to add the sound and set the picture anyway. No matter whether free or commercial

Hello.
Try this . I used to edit the soundtrack with it and it was OK.
Regards, DTRQ

Mkvtoolnix - https://mkvtoolnix.download/

How do I add a sound file to the player if I want to play it with the movie at the same time?

You wrote:

Quote:

How to add a soundtrack to a movie without affecting the quality of the movie

so I gave such a program.

Why in Wondershare Filmora 8.5.1.4 there is no option to save the movie to DivX
There is only XviD and Mpeg and Mp4
After all, I have DivX installed on the system from the site



The original DivX converter can also convert materials, but it lacks a lot of goodies, such as transitions or special effects

Windows 7 Ultimate SP1 64 bit

I don't know why you wonder about strange programs, since you have the best MKVToolNix given above. Before you add a movie track without changing its quality. Besides, what DivX again? It's an outdated codec. Mp4 will be better in every respect.

If you want to "enlarge" the movie, or rather cut these black stripes on all sides, then the best will be Avidemux. Only here you can not do it without changing the quality, otherwise the filter option is inactive, and it is in them that you choose the active field that is to remain, and the remaining part is cut off.