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View Full Version : Editing mkv files with unknown audio tracks in latest VirtualdubMod


ChristianHJW
11th June 2003, 09:43
Hi,

with the long changelog of the bugfix build of VirtualdubMod from 10/06/03 , please allow me to point you to a specific feature that Cyrius has built into this version, demonstrating very impressively the advanced editing possibilities of matroska. Do the following :

1. Use mkvmerger with the following CLI ( or jcsston's GUI for it, all avaialble from the matroska Downloads Page (http://cvs.corecodec.org/cgi-bin/cvsweb.cgi/%7Echeckout%7E/matroska/doc/website/downloads/downloads.html) ) :

mkvmerge.exe -o output.mkv input.avi input.aac input.dts

The resulting file will be a matroska file with the video from the AVI, the audio from the AVI ( if it had one ), an AAC audio stream and a DTS audio stream.

So far so good, nothing unusual you might say :)

2. Now load the MKV in latest VirtualdubMod and have a look at the streams list :

It will report 2 or 3 audio streams there, and only the audio from the AVI ( if it had one ) will be named precisely. The other 2 are named

Source : matroska file
Decription : matroska audio stream 1, [tag 0x000 , ?] ; ID A_AAC/MPEG2/LC , x ch, xxxxx KHz , xxx kbps

Source : matroska file
Decription : matroska audio stream 2, [tag 0x000 , ?] ; ID A_DTS , 5.1 ch, xxxxx KHz , xxx kbps


Now, you are certainly aware that there are no ACM codecs for AAC or DTS, same as for AC3. But you are used to be able to edit AVI/OGM/MKV files with AC3 audio nicely, maybe without knowing what effort it took to make sure the AC3 audio is handled correctly on editing, means that no AC3 frame is cut in 2 pieces or the like.

3. Now try to edit the file, like cutting out a piece. You will notice its working great, just like you are used to with AC3 !

The big difference now is, this will work for any audio stream you will be able to mux into matroska, out of the box, even for future audio formats !!!! No time consuming adaption of VdubMod for MPC audio, once its here.

Of course, you cant listen to them in Preview mode, because there is no AAC or DTS decoder available in VdubMod ( yet :D ), but for editing its important to see the video part i think, audio has lower priority.

Test it and tell us how you like it :D !!

JagPanzer
11th June 2003, 10:10
Sounds great! But I am not able to download the lastest VitualDubMod. :(

I will try later again.

And to all Matroska Team: you guys are GREAT! :D

Sigmatador
11th June 2003, 11:11
Good job ^^
Matroska Powa ^^

Lobuz
11th June 2003, 17:56
One question why I can't demux AAC audio to mka from mkv, why I can't add demuxed AAC stream(it's playable in foobar). It should work cause it's great editable Matroska. :D
Maybe VDubMod should be modified to handle equally differt A/V/S streams more like other non linear editing tools for example Digital Fusion.

Regards
Lobuz