AUDIO from avisynth (or Virtualdub)

[marcorocchini]

thanks a lot, it works very well

[marcorocchini]

Hi everyone again,

because I have some problem to understand Avid I try to use the old "In sync Blade 2.2" to edit the .mxf-HD clip and this software seems work very well also in HD.

But it does not have included the codec to read .mxf files, hoewver it try to get "frameserve" from DirectShow codec of windows system to use various format.

Now I can import to the timeline a video file .mxf, but with the audio track I have some problem: the Blade crashes whrn I try to scrub the audio track in timeline .. however the audio track is a mono track and don't have the audio of the clip. Is evidence there is a problem on the direct show filter, but I'm not very expert of ds-filter.

I can import a .mxf file when have installed on my system in this sequence 1) "OpenCube.MXF.Format.Reader.v2.1.0.exe" [but with the DSFMgr.exe I leave only the Opencube AES filter] 2) "Sony.XDCAM.decoder.v2.20.exe" and 3) "MainConcept.MXF.Decoder.v9.6.8.2473.exe"


But this way I can use only the video track, the audio track is an invalid track.

I would like ask: is there a way to resolve the audio-import problem?

In avisynt I used this script to achieve a .wav file with channel audio 1 and 2 of the camera:

vid= ffvideosource("v:\automazioneclip\input\temp.mxf" )
left = ffaudiosource("v:\automazioneclip\input\temp.mxf", track = 1).AmplifydB(5)
right = ffaudiosource("v:\automazioneclip\input\temp.mxf", track = 2).AmplifydB(5)

both=mergechannels(left, right)

audiodub(vid,both)
ConvertAudioTo16Bit()
SoundOut(output = "wav", filename="v:\automazioneclip\output\temp.wav", type=0, format=1, autoclose=true, showprogress=true, overwritefile="yes")

but this script can "extract" one .wav file from a .mxf file. I would like to import in timeline video/audio from a .mxf file

However would be uncomfortable every time having to synchronize the video track .mxf with the audio every time is to be obtained. In addition, the audio track .wav obtained by the script is 1 frame shorter than the video track of the file.mxf source, so is difficult can join them.

On the web I see this FFMBC http://code.google.com/p/ffmbc/ that maybe it can remux the audio track and reasseble the .mxf file to to contain only audio CH1 and CH2 (L+R stereo) and nothing of all the other audio tracks.

Can anyone able to use ffmbc for generate from a .mxf file, one .mxf with identical video but with only audio CH1/CH2?

my .mxf file are HD422 XDCAM files

On my dropbox I have put a c0010.mxf example file

thanks a lot

[Selur]

Since ffmbc is based on ffmpeg the line I posted before:

ffmpeg -i h:\AUDIO.MXF -vn -filter "channelmap=1|2:channel_layout=stereo" h:\out.wav

+ passing through the video and exchanging ffmpeg with ffmbc

ffmbc -i "path to input mxf" -v:c copy -filter "channelmap=1|2:channel_layout=stereo" "path to output mxf"

+ "-acodec pcm_s16le" since you want 16bit audio

ffmbc -i "path to input mxf" -v:c copy -acodec pcm_s16le -filter "channelmap=1|2:channel_layout=stereo" "path to output mxf"

this does however not boost the audio volume (which might also be possible but I'm to lazy to look it up)

-> haven't tested the command lines I posted, but even if the don't work they should provide a solid starting point,..

[marcorocchini]

thank you selur, at the moment I try a way to rebuild the same .mxf but containing only the firt 2 audio channel and not all the 8 audio channel.

For example is you download the .mxf file of example (on my dropbox www.dropbox.com logon into it with this credential: user: mrocchini@email.it password: centrale forlder: "public" , i have put the file C0010.MXF) this C0010.MXF have this proprietis in Media Info:

General
Complete name : D:\gatteo\C0010.mxf
Format : MXF
Commercial name : XDCAM HD422
Format profile : OP-1a
Format settings : Closed / Complete
File size : 78.3 MiB
Duration : 10s 880ms
Overall bit rate : 60.3 Mbps
Encoded date : 2013-05-24 21:40:57.000
Writing application : SONY Opt 1.22
Writing library : SONY Opt 1.22

Video
ID : 2
Format : MPEG Video
Commercial name : XDCAM HD422
Format version : Version 2
Format profile : 4:2:2@High
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Format settings, GOP : M=3, N=12
Format_Settings_Wrapping : Frame
Duration : 10s 880ms
Bit rate : 50.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.965
Stream size : 64.8 MiB (83%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio #1
ID : 3
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #2
ID : 4
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #3
ID : 5
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #4
ID : 6
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #5
ID : 7
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #6
ID : 8
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #7
ID : 9
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Audio #8
ID : 10
Format : PCM
Format settings, Endianness : Little
Format_Settings_Wrapping : Frame (AES)
Duration : 10s 880ms
Bit rate mode : Constant
Bit rate : 1 152 Kbps
Channel(s) : 1 channel
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Stream size : 1.49 MiB (2%)

Other #1
ID : 1
Type : Time code
Format : MXF TC
Time code of first frame : 01:08:33:24
Time code settings : Striped

Other #2
Type : Time code
Format : SMPTE TC
Muxing mode : SDTI
Time code of first frame : 01:08:33:24


I would like to do a command line that rebuild the same file but with only VIDEO and CH1/CH2 audio (left and right 48Khz 16Bit PCM .WAV inside) so when I import the C0010.MXF into the timeline of InSyncBlade maybe (??? I don't know if work...) I suppose to have 1 video and 1 audio track. Instead now, when I import a .mxf file in InSyncBlade the audio track don't contain audio and if I try to scrub the audio track... all crashes.

So this command line should rebulid a .mxf with exactly the video essence, and exclude the 6 audio track I don't want (I don't want audio CH3-CH4-CH5-CH6-CH7-CH8)

OR

in alternative, I need a command line the exclude all the audio track from an .mxf file... because maybe the crashes depenbing from a reading problem of the audio.
So for me is suitable, by a 2 chance, a .mxf with only the video part (I can achieve audio separately, but at least I don't risk the crash when I try to import a .mxf in timeline)

[Selur]

thank you selur, at the moment I try a way to rebuild the same .mxf but containing only the firt 2 audio channel and not all the 8 audio channel.

ah, okay you want to combine the first two mono (channel) audio streams into a single new stereo (channel) audio stream.