First method in GUI with VLC.
To convert correctly we need two programms, VLC and ffmpeg.
Open a terminal and enter the line:
Code: Select all
sudo apt install vlc ffmpeg -y
Now we can open VLC:

Got to the Media Menu and select "converting/save":

Add your mkv file:

We need to choose the converting and output profile:

Go to the wrench for the advanced options, select the MP4/MOV encapsulation method:

Go to the video codec and select H264:

And the audio codec, select MPEG-4 Audio and 44100Hz sampling frequency:

Save your profile.
Now we can select the destrination for our file and start the converting, we can follow the progress bar:


The conversion will take some time depending on the size of your file, just be patient
When the task are ended VLC are still:

And at least we have a new file in mp4 output:

Second Method in CLI.
We need to open an termical window and add this line:
Code: Select all
ffmpeg -i path_to_my_mkv -strict -2 -r 44100 -codec copy my_file.mp4
Done!