how to transcode audio from a clip so that...

[marcorocchini]

Hi,

please can someone help a cat?

I have an input MXF source with 8 audio monotrack (IN.MXF) this

https://www.swisstransfer.com/d/657054c8-ebc3-464d-9b7b-443c50dde13b

with:

CH1=britney spears audio content
CH2= rondo veneziano audio content

CH3= another music
CH4= another music again

please ignore CH3 and CH4 and all the rest, consider only the first 2 audio channels: britney and rondo.

I need to generate an output .wav (or a .mov) file so that

CH1= content the mixDown of CH1+CH2 source = britney+rondo panpotted audio
CH2= content the mixDown of CH1+CH2 source = britney+rondo panpotted audio
CH3= only britney
CH4= only rondo

need to preserve max audio quality in the transcoding process

video not needed

how can I do? thanks

[Selur]

Read up on how to use sox, or how to mix audio with ffmpeg.

[ProWo]

Read this
https://trac.ffmpeg.org/wiki/AudioChannelManipulation

[marcorocchini]

ffmpegOCT2024.exe -y -vn -i in.mxf -filter_complex "[0:1] [0:2] amerge" -c:a pcm_s24le -ar 48000 temp1.wav

ffmpeg2014.exe -y -vn -i in.mxf -i temp1.wav -af "pan=stereo:c0<c0+c1:c1<c0+c1" -c:a pcm_s24le -ar 48000 temp2.wav

ren temp1.wav tempAudio_PAIR2_ForFFmbc.wav

ffmbc.exe -threads 8 -y -i in.mxf -i temp2.wav -i temp1.wav -tff -target xdcamhd422 -vcodec copy -an "%cd%\%~n1_daR1mxf_aMXF_4CanaliAudio_Primi2Mixati_Secondi2Separati.MXF" -acodec pcm_s24le -ar 48000 -newaudio -map_audio_channel 1:0:0:0:1:0 -acodec pcm_s24le -ar 48000 -newaudio -map_audio_channel 1:0:1:0:2:0 -acodec pcm_s24le -ar 48000

I do something like this but there is a redundant usage I think