avisynth: how to load and expose 2 audio tracks instead of only one?

[marcorocchini]

Hi >&& respect for cats thanks

please consider this source that have only 1 audio track (with 2 stereo channels) correctly loaded (with video) in avisynth:

https://www.dropbox.com/s/uzuqgmlykcor2o0/input1_2.mov?dl=0


[Attachment 49899 - Click to enlarge]

vid=LWLibavVideoSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2.mov")
aud=LWLibavAudioSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2.mov")
left=GetChannel(aud, 1)
right=GetChannel(aud, 2)
both=mergechannels(left, right)
audiodub(vid, both)
ConvertAudioTo16Bit()

and all is ok

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But now I have another source: is the same but with another audio track (in total are 2 audio tracks, and each one have 2 audio channels)

https://www.dropbox.com/s/h2x204v9csf7io2/input1_2_3_4.mov?dl=0


[Attachment 49900 - Click to enlarge]

How to load the second audio track in avisynth?!?

How can I do the script so avisynth expose the 2 audio tracks?

thanks

[jagabo]

Why don't you just read the LSmash docs? Hint: stream_index.

[marcorocchini]

[Attachment 49901 - Click to enlarge]

because I'm a cat

low level intellingent cat

[marcorocchini]

vid=LWLibavVideoSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov")
aud=LWLibavAudioSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov", stream_index=0)
aud2=LWLibavAudioSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov", stream_index=1)
left=GetChannel(aud, 1)
right=GetChannel(aud, 2)

ch3=GetChannel(aud2, 1)
ch4=GetChannel(aud2, 2)
both2=mergechannels(ch3, ch4)

both=mergechannels(left, right)
audiodub(vid, both)
ConvertAudioTo16Bit()

I can try lo load internally to the .avs the second audio track but with audiodub how have to do?

this script expose only 1 audio track, how I have modify the script to have the 2 audio ?

[jagabo]

You want to mix the two audio tracks? Use MixAudio():

vid=LWLibavVideoSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov")
aud=LWLibavAudioSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov", stream_index=0)
aud2=LWLibavAudioSource("C:\Users\Administrator\Desktop\Nuova cartella (7)\input1_2_3_4.mov", stream_index=1)
AudioDub(vid, MixAudio(aud, aud2))

What's the point of splitting a stereo track into two mono tracks them merging them back into a stereo track? That puts you right back where you started. Are you trying to accomplish something else?

[marcorocchini]

no sorry I don't need to mix the audio tracks, simply I need to expose the 2 audio track where each track have the 2 audio stereo channels. All audio channels have to be separated

[sneaker]

How can I do the script so avisynth expose the 2 audio tracks?

AviSynth doesn't support multiple audio track output. You could only mix 2 stereo inputs into a 4 channel track, then separate them again in the software you are using to access AviSynth's output (e.g. ffmpeg). Or simply use 2 different scripts.

[jagabo]

You could merge the four channels into a single quad track:

MergeChannels(GetChannel(aud, 1), GetChannel(aud, 2), GetChannel(aud2, 1), GetChannel(aud2, 2))

But it will be up to you to keep track of them in later processing.

[marcorocchini]

[Attachment 49903 - Click to enlarge]

audPair1=LWLibavAudioSource("spaceForInputFileNameAudio", stream_index=0)
audPair2=LWLibavAudioSource("spaceForInputFileNameAudio", stream_index=1)
leftPair1=GetChannel(audPair1, 1)
rightPair1=GetChannel(audPair1, 2)
leftPair2=GetChannel(audPair2, 1)
rightPair2=GetChannel(audPair2, 2)
both=mergechannels(leftPair1, rightPair1, leftPair2, rightPair2)
audiodub(vid, both)
ConvertAudioTo16Bit()

slightly modified but seems works

AviSynth doesn't support multiple audio track output.

yes it's true, if I don't mistake output 1 track but in this case with 4 audio channels. However Mainconcept totalcode recognize as well this audio configuration


[Attachment 49904 - Click to enlarge]