Go to File>Convert/Save. Add the video you want to convert. Click the wrench icon next to the profile dropdown. Go to the Audio codec tab. Enable ‘Audio’. Complete video conversion and check the converted video for audio. 2. Change audio sample rate. Audio has a property called sample rate which determines its quality. Open the MKV file in XMedia and in the Format tab set the options to Profile Custom, Format MP4, Extension MP4. Click the video tab and highlight the video track in the right-hand Output window. Click the X button to remove all information from the window. Click the video track shown in the left-hand Source window. Or you can use Synaptic to install it. To convert mMP4 to MKV, follow the steps below: Click on the movie like icon, to choose the MP4 file to be converted. Click on the file to select it. Make sure the output type is mkv, and then click on the green button to start the conversion. Share. On OS X, you select VLC menu and then Preferences. Then click Show All at the bottom left. Then under Video Codecs in the left pane, select FFmpeg, scroll halfway down and change Strict standard compliance to -2. If you want to open an mpeg4 video an alternative is to use the command below: Want convert an MKV file to MP4 try this step I hope this work for you. Run "VLC media player". From main menu select "Media" > "Convert / Save". On "File" tab, click "Add" button. Choose you MKV file. After that, it should be added to the list. (Alternatively, you can drag&drop a file into the list.) Click "Convert/Save" button. VLC defaults to the first audio track. Specifically: Input => MKV: Video + Audio (1=English / 2=French / 3=Spanish / 4=German) Output => MP4: Video + Audio (Spanish) Please, no workarounds. In fact, right now I use MKVToolNix to remove the undesired audio track (s) and then convert the file in VLC. However, I wonder what the solution within VLC Run VideoProc Converter AI and choose Video category. Open VideoProc Converter AI on your computer and click on Video icon on the homepage. Step 3. Upload your AVI videos. Click +Video tab from the top toolbar to upload your AVI files. Then go to Video section at the bottom and choose MKV as target format. Start VLC (you don't have to play a video at this time) Go to "Tools" -> "Preferences" (CTRL+P on Windows) On the lower left corner choose "Show settings" -> "All". On the left part of the settings window, scroll down and select "Video". On the right part of the settings window, scroll down to "Source aspect ratio". 1Upload a file. Upload the MKV file you wish to convert. Just drag & drop it onto the page, or click the blue button to choose from a folder on your device (you can also add files from Dropbox, or even straight from a YouTube URL). Step 1: Launch VLC Media Player. After launching VLC Media Player, you need to click on the followed by Convert/Save option. Doing this opens up a new window. Step 2: Add the MKV file you wish to convert. Next, you need to click on the button from the File tab. V60v.