Convert A_AAC audio to AC3

[ikarishinji41]

Hello! I have an MKV file with several audio tracks inside it. I'm interested in two of them to put on a DVD project, so I need to convert them to AC3. The information about the files I get from MKVExtractGui is:
Track 2: audio, A_AAC/MPEG4/LC/SBR [eng] English Audio Track (DD 5.1) (6ch, 2400hz)
Track 3: audio, A_AAC/MPEG4/LC/SBR [jap] Japanese Audio Track (DD 5.1) (6ch, 2400hz)
And when I extract, say, Track 3, I get a file like this:
Lupin III Castle of Cagliostro (1979) - (Rupan sansei Kariosutoro no shiro)_track3_jpn
with no extension. This is supposed to be the Dolby Digital 5.1 japanese audio track for the movie. However, I don't know how to convert it to ac3. Can somebody please help me?

[bat999]

Can somebody please help me?

Hi
Use mkvmergeGUI to make an mka file containing only Track 2
and
Use mkvmergeGUI to make an mka file containing only Track 3

Then convert these two mka files to ac3.
FFmpeg will do the job.
From here ---> http://ffmpeg.zeranoe.com/builds/

ffmpeg -i filename.mka -c:a ac3 -b:a 384k filename.ac3

[ikarishinji41]

Great! Thank you very much, it worked perfectly!