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Convert MKV FLAC to MP4/MKV with AC3/AAC 5.1,extract Audio FLAC

MKV is a open and free media container format (the Matroska Multimedia Container) which can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. The common MKV files we see are codeced with H.264 video and AAC audio. As the demand of high quality audio enjoyment, more and more MKV files are codec with DTS AC3, FLAC audio.

MKV FLAC can give people extraordinary listening experience as audeo codeced is used the losslessly audio format FLAC. However, the compatiblity of MKV FLAC is quite limited. If you want to play MKV with FLAC audio on other devices, you will need to convert or remux MKV FLAC with AAC, AC3, or MP3 audio.

This article aims to solve:

Step-by-Step Guide to Convert MKV FLAC to MP4/MKV with AC3/AAC 5.1 or extract FLAC form MKV FLAC and convert to desired audio.

PrePare: Free Download PavTube Video Converter


Pavtube Video Converter is an all-in-one video converter tool specially developed for users to convert videos from one format to another. Pavtube Video Converter offers batch and fast solution to convert/remux MKV FLAC to MKV/MP4/MOV with AC3/AAC 5.1 as well as extract FLAC from MKV FLAC files and convert to AC3, AAC, MP3 in stereo or 5.1 surround sound (6 channels).

Step 1 Add Matroska FLAC (.mkv) files

Click on “Add Video” button load your FLAC MKV files.

Step 2 Set output format

Click the drop-down list on the right side of the “Format” to select desired audio or video formats from “Common Video” or “Common Audio” Category.

To extract FLAC from MKV FLAC file and convert to audio only AC3, AAC, MP3, WAV, M4A, etc, from “Genera Audio” Category, select “AC3 – Dolby Digital AC-3 (*.ac3)” or “AAC – Advanced Audio Coding(*.aac)” or “MP3 – MPEG Layer 3 (*.mp3)” as the output format

To convert video MKV FLAC to MP4/MOV/MKV/AVI with AC3, AAC, MP3 5.1 or stereo sound, from “Common Video” choose desired video formats

Take converting MKV FLAC to MP4 AC3 for example, from “HD Video” choose “HD H.264 Video (*.mp4)” as the output format

Step 3: Customize audio codec

Click “Settings” to open “Profile Settings” window.

You will see two sections including “Video” and “Audio” .

In the “Audio” section, click “Audio Codec” drop-down and choose “AC3”.

If you source video is in 6 channels and you want get 5.1 AC3 surround sound. Otherwise, click “Channels” drop-down and choose “Steteo”.

Step 4: Start Convert

Click “Convert” button to finish converting MKV FLAC files to desired video or audio format.


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