AUDIO from avisynth (or Virtualdub)

[marcorocchini]

Hi everyone,
I have a .mxf file (Sony XDCAM HD 4:2:2 from a Sony PDW-F800 camera) that I would to extract only CH1 and CH2 audio.
I would have one ouput .wav (PCM 48.000) file that have only the first 2 audio channel, and not the others channel.

Is there a way in virtualdub or avisynth to extract only the 2 first audio channels?


FFAudioSource("v:\automazioneclip\input\temp.mxf")
?? ??


thanks to all

[jagabo]

I'm pretty sure Audacity (with the ffmpeg source plugin) will allow you to select which track to import from an MXF file.

http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown

[poisondeathray]

Did you want to extract it to two mono wavs ? or use it in an avs script ?

To extract you can use ffmpeg

ffmpeg -i input.mxf -vn -acodec copy -map 0:1 output1.wav
ffmpeg -i input.mxf -vn -acodec copy -map 0:2 output2.wav

I think you can combine into 1 line

ffmpeg -i input.mxf -vn -acodec copy -map 0:1 output1.wav -vn -acodec copy -map 0:2 output2.wav

I'm pretty sure Audacity (with the ffmpeg source plugin) will allow you to select which track to import from an MXF file.

http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown

Yes this works

It's probably better this way, you can specify a mix to stereo easily.

ffmpeg sucks for audio manipulation and I think you would need to pipe it to sox to get stereo




Another way in a avs script for stereo mix (I think these are the correct #'s for track numbers , or it might be track=0, track=1 for ffaudiosource )

vid= ffvideosource("input.mxf")
aud1= ffaudiosource("input.mxf",track=1)
aud2= ffaudiosource("input.mxf",track=2)

both=mergechannels(aud1,aud2)
audiodub(vid,both)

# soundout()

You can use soundout() to encode audio directly from an avs script

[Selur]

FFAudioSource("v:\automazioneclip\input\temp.mxf")
?? ??

-> http://avisynth.org/mediawiki/GetChannel

[marcorocchini]

On my dropbox I have put an AUDIO.MXF in wich I have recorded in channel audio 1 the radiomicrophone and in channel audio 2 the panoramic mic of the camera. This two audio are hearing different.

Tha camera is set in IMX [D-10] mode so the video recording is SD and 4 audio channel @ 24 bit per channel (otherwise camera can be set to record 8 audio channel @ 16 bit per channel).

I have tried many ways but I get errors.

AUDIO.MXF can be download to my dropbox by logon into the dropbox (www.dropbox.com) ad logon into it with this credential:

user: mrocchini@email.it
pass: centrale

I would like to get a single file in stereo, that have ch1 and ch2 (48.000 sample, 16 bit)

Thanks to everyone!

[Selur]

I have tried many ways but I get errors.

What have you tried and what error do you get?

video = FFVideoSource("v:\automazioneclip\input\temp.mxf")
audio = FFAudioSource("v:\automazioneclip\input\temp.mxf")
mono = GetChannel(audio, 1)
return AudioDub(video, mono)

should return the video with the first audio channel

[marcorocchini]

I'm not able to hear directly audio on virtualdub. Simply I try to "Save Wav file" but the winamp get an error because maybe the .wav file is not a 16bit/48KHz PCM file

I attach on this post an audio file of example that is correct (but CH2 is replicaded on CH1, however is a PCM/16bit/48Khz audio) this audio format file is my reference: 28.wav

[marcorocchini]

simply from AUDIO.MXF I need of one stereo file (L+R: L=CH1 and R=CH2 or viceversa) PCM 48Khz

[poisondeathray]

The dropbox audio.mxf has 1 audio track, 4 channels . (ie. it's multiplexed into 1 wave)

You can access each channel in audacity to do your own mix e.g. maybe you only want ch1 and ch2 to export stereo mix .

File => export => advanced mixing options (output channels 2)

[Selur]

when I open:

LoadPlugin("g:\Hybrid\avisynthPlugins\ffms2.dll")
video = FFVideoSource("h:\AUDIO.MXF")
audio = FFAudioSource("h:\AUDIO.MXF")
mono = GetChannel(audio, 1)
return AudioDub(video, mono)

here with Virtual Dub I can clearly hear the audio
-> no clue where your problem is.

+ I agree with poisondeathray if you just want to extract a specific channel without any video processing, Audacity is the way to go.

[marcorocchini]

oh yes thanks, but audacity don't open audio.mxf

is there a way to open it?

[poisondeathray]

oh yes thanks, but audacity don't open audio.mxf

is there a way to open it?

Yes with the ffmpeg plugin (see jagabo's link above)
http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown

[marcorocchini]

oh fantastic, now I can open it, but is there a way to do a script for virtualdub or avisynt that do the operation?

[marcorocchini]

FFmpeg_v0.6.2_for_Audacity_on_Windows.exe

[marcorocchini]

si practically I should remove CH3 and CH4 and export in stereo mode, PCM/48000Hz separate channels

[poisondeathray]

oh fantastic, now I can open it, but is there a way to do a script for virtualdub or avisynt that do the operation?

Since you have 1 audio track, 4 channels, you can use getchannel() as suggested by selur . Note this is different that the other example above with ffaudiosource and track=# , (4 or more mono audio tracks instead of 1)

vid= ffvideosource("audio.mxf")
aud= ffaudiosource("audio.mxf")

left = GetChannel(aud, 1)
right = GetChannel(aud, 2)

both=mergechannels(left, right)

audiodub(vid,both)

[poisondeathray]

si practically I should remove CH3 and CH4 and export in stereo mode, PCM/48000Hz separate channels

It's up to you, you can mix alll 4 of them in if you want into a stereo mix

[marcorocchini]

sorry, I get this attached error

maybe I have uninstall any avisynth/plugin?

[marcorocchini]

OH no sorry, I don't have specify the correct path

alzheimer

[Selur]

what ffms2 version are you using?

[marcorocchini]

oh fantastic, now I can open it, but is there a way to do a script for virtualdub or avisynt that do the operation?

Since you have 1 audio track, 4 channels, you can use getchannel() as suggested by selur . Note this is different that the other example above with ffaudiosource and track=# , (4 or more mono audio tracks instead of 1)

vid= ffvideosource("audio.mxf")
aud= ffaudiosource("audio.mxf")

left = GetChannel(aud, 1)
right = GetChannel(aud, 2)

both=mergechannels(left, right)

audiodub(vid,both)

With this script virtualdub open the AUDIO.MXF but when I try to Save WAV file I get this attach error:

[marcorocchini]

what ffms2 version are you using?

No sorry, I'm alzheimer (I don't have specify the correct patch of audio.mxf)

[marcorocchini]

Also I tryed to do this:

In virtualdub-->Audio-->Conversion I set as attach [AUconv.bmp]

and Save WAV file

but my winamp don't read the ouputted .wav file because maybe is different than a PCM/48Khz files

[marcorocchini]

this is AUconv.bmp

[marcorocchini]

maybe is there a way to generate the .wav file directly from the script?

[Selur]

Yes -> http://avisynth.org/mediawiki/SoundOut
(script still needs to be played in full by some application)

[marcorocchini]

oh fantastic, now I can open it, but is there a way to do a script for virtualdub or avisynt that do the operation?

Since you have 1 audio track, 4 channels, you can use getchannel() as suggested by selur . Note this is different that the other example above with ffaudiosource and track=# , (4 or more mono audio tracks instead of 1)

vid= ffvideosource("audio.mxf")
aud= ffaudiosource("audio.mxf")

left = GetChannel(aud, 1)
right = GetChannel(aud, 2)

both=mergechannels(left, right)

audiodub(vid,both)

sorry maybe I forget an important thing:

Finally I would like to achieve video and audio separate files:

from audio.mxf I have to generate a video.avi file and a audio.wav file

Not all in one file

I forgot to say it

[poisondeathray]

For the vdub error, add to the end of the script

ConvertAudioTo16Bit()

sorry maybe I forget an important thing:

Finally I would like to achieve video and audio separate files:

from audio.mxf I have to generate a video.avi file and a audio.wav file

Not all in one file

I forgot to say it

It doesn't matter; you can save audio and or video separately with the same script

[marcorocchini]

Yes -> http://avisynth.org/mediawiki/SoundOut
(script still needs to be played in full by some application)

yes, I have install it as plugin in avisynth but I'm not able to use it

[Selur]

doesn't

SoundOut(output = "wav", filename="c:\outputFile.wav", atype=1, format=0, autoclose=true, showprogress=true, overwritefile="yes")

work ?