Convert MKV FLAC to AC3 5.1 on Windows/Mac

Have you ever encountered can't play MKV FLAC with audio on your MKV player or add MKV FLAC videos into video editor? Have the need to convert MKV FLAC to a more popular audio codec such as AC3 5.1? Some MKV videos that have FLAC audio as the sound track are demuxed from Bluray .m2ts movies.
Bigasoft Total Video Converter can work as a powerful audio track converter. You don't have to extract the FLAC soundtrack first before converting to AC3. With this MKV FLAC to AC3 Converter, you can convert FLAC to AC3 5.1 as well as embed the AC3 track to MKV with a single click.
Detailed guide:
http://www.bigasoft.com/articles/mkv-...
Windows program:
http://www.bigasoft.com/total-video-c...
Mac version:
http://www.bigasoft.com/total-video-c...