What GUID(s) / wFormat tag(s) is AAC officially using ?

i believe nic used the wFormat tag of 255.

Toff has AAC from matroska working :) .. he was using the funny DShow filter from Borgtech, the one they did for their proprietary MPX container, and mapped the wFormat tag they use ( 0xAAC0 ) from the matroska DShow parser :) ....

AAC in matroska 

After more than 2 years hanging out here i actually dont know if this should be posted in the 'New A/V formats' forum or here .. LOL. If the mods here feel it doesnt belong here, feel free to move it ;) ! Toff and Mosu got it working :) ! Since yesterday mkvmerger can mux AAC audio into matroska audio and video files, and mplayer can play these files on Linux, almost same time ! Now, the good news for all Windows users is, mkvmerger will compile fine on cygwin, so we have a win32 version of it also :) ! Jcsston is already working on the GUI for it, but until then you guys will have to use CLI :D .... Toff on the other hand fixed our DShow parser, he mapped the matroska codec IDs for AAC to call borgtech's fancy AAC Dshow filter ( its using a very unusual and unoffical wFormat tag, '0xAAC0' ), and it plays just fine :) . Give us some time to make a nice package for you to upload, and you guys can start playing with it ... Christian

Re: AAC in matroska 

nice i'm really looking forward to matroska with aac (: btw: does anybody know something about the channel cupling status? is it working already? regards steVe

So, that's the reason why it libfaad always crashed on me, when I changed wFormatTag last week. Obviously the 3ivx splitter filter doesn't provide the necessary data for FAAD2. Thumbs up, get it going! tiki4

I just looked at the borgsoft decoder. It doesn't use any decoderSpecific initialization, it doesn't support audio chunks (only frames), and finally doesn't check errors properly... No chance it could work as is connected to the 3ivx splitter. Anyway, it wasn't written with this goal in mind ... The minimum requirements would be to call /* Init the library using a DecoderSpecificInfo */ char FAADAPI faacDecInit2(faacDecHandle hDecoder, unsigned char *pBuffer, unsigned long SizeOfDecoderSpecificInfo, unsigned long *samplerate, unsigned char *channels); with the end of the WAVEFORMATEX structure before calling the first faacDecDecode ...

ok, as posted elsewhere already, there is a new version of the modified Borgtech filter from Toff in the 'CoreAAC' CVS now .... but we took the link to the binaries down, as said before. Here is the link to the latest matroska parser filter including official AAC DS support : It should work fine with 3ivX AAC decoder filter, or with latest compiles of CoreAAC, and this will include 5.1 AAC playback support ;) ...

I couldn't get it to work here, Mkvmerge app terminates it self with the following error: Using AVI demultiplexer for xvid.avi. Opening file. This may take some time depending on the file's size. +-> Using video output module for video stream. Die @ r_avi.cpp/186: in safemalloc: malloc == NULL The source files where plain xvid avi and aac 128 vbr.