How to open aac file in avisynth?

[lovyagin]

I trying to convert MKV files to AVI. Because MKV have more then one audio tract I have to demux it before open it in VirtualDub. But I do not know how to import AAC audio to VirtualDub using AVISynth. Although I've CoreAAC installed and AAC files are played properly in Media Player Classic. But I can't open them in AVISynth directly. I tried DirectShowSource("File.aac") but it returns could not open either video or audio, could not find proper codec combination.

As a temporal solution I "mux" aac to mka file and it opened in AVISynth properly, but I need extra time to pass throw one more muxing doing this way.

Could someone help me to open AAC files in AVISynth directly?

[El Heggunte]

Hi there.

I recommend "BassAudioSource()" for opening standalone compressed audio files:

http://forum.doom9.org/showthread.php?t=135855&highlight=bassaudio&page=2

You will also need the latest "Bass DLLs" from «un4seen.com».

HTH.

[lovyagin]

Hi there.
I recommend "BassAudioSource()" for opening standalone compressed audio files

Thanks for suggestion, I'll try it, but

You will also need the latest "Bass DLLs" from «un4seen.com».

I suppose that BassAudioSource will use NOT a CoreAAC or FFDShow to decode audio? Doesn't it mean risk of lower quality result?

[poisondeathray]

Doesn't it mean risk of lower quality result?

No, unless there is a bug with that specific build

[lovyagin]

Oh, pam I doing something wrong? I took BassAudio.dll from 7z archive of https://www.videohelp.com/tools/BeHappy/old-versions#download and put to plugins directory of AVISynth. But it says no function named BassAudioSource()...

[poisondeathray]

Is that the error message?

Did you try LoadPlugin("...\BassAudio.dll")

[lovyagin]

Is that the error message?

Did you try LoadPlugin()

Sure, but this way it says could not load "BassAudio.dll"

[El Heggunte]

As I said, you will also need the files bass.dll AND bass_*.dll,
which should all be copied to a "PATHed" folder (usually the system32 directory).

[lovyagin]

As I said, you will also need the files bass.dll AND bass_*.dll,
which should all be copied to a "PATHed" folder (usually the system32 directory).

Am I need all of them, or bass_aac should be enough? I've copied it to a PATHed directory from plugins one, but it does not help...

[Gavino]

You need at least bass.dll as well as bass_aac.dll.

[lovyagin]

You need at least bass.dll as well as bass_aac.dll.

Thanks, I've just added Bass.DLL and everything works perfectly

BassAudio.dll, Bass.dl,l Bass_aac.dll - all in PATHed or current directory, script

LoadPlugin("BassAudio.dll")
BassAudioSource("file.aac")

works finely, just strange clean gray video appears, this is weird, but not a problem.

Thanks you all again for help.

[Gavino]

works finely, just strange clean gray video appears, this is weird, but not a problem.

BassAudioSource actually produces a video stream too (I think for diagnostic purposes). Usually you don't see this, since in most cases you would use the result with AudioDub and another video.

[johns0]

I use DirectShowSource("d:\file.mkv") to open mkv in virtualdub.

[lovyagin]

BassAudioSource actually produces a video stream too (I think for diagnostic purposes). Usually you don't see this, since in most cases you would use the result with AudioDub and another video.

Yep, sure, and there is KillVideo() at last...

I use DirectShowSource("d:\file.mkv") to open mkv in virtualdub.

yep, I use it to encode video, but not audio, because it works fine if mkv has only one audio stream, but if contains two or more audio tracks demuxing is required. Just, well, probably I could use MKVToolnix (mmg, not mkvextract) to remux all them to mka files, not aac directly, and use DirectShowSource(), this is a way too, but I'll be more calm if I know how to open separate audio tracts in AVISynth too.