(ffmpeg - Audio) Two streams, One Channel, Two Languages

Question

I need your help with a command line for ffmpeg that I just started to use.

Here's the deal :

I have a .MOV file witch contains 18 audio streams (for 7.1). Stream 1 to 10 is for original language and stream 11 to 18 is for French version.

What I want to do :

1. merge stream 1 (Lt) and 2 (Rt) in a single orginal language stereo track
2. merge stream 10 (Lt) and 11 (Rt) in a single French language stereo track
3. Tag them properly to identify them when playing the video.

Here's my command :

ffmpeg -ss 00:00:00.00 -t 00:15:00.00 -i input.MOV
-map 0:v:0 -map 0:a:0 -map 0:a:1 -map 0:a:2 -map 0:a:3 -map 0:a:4 -map 0:a:5 -map 0:a:6 -map 0:a:7 -map 0:a:8 -map 0:a:9 -map 0:a:10 -map 0:a:11 -map 0:a:12 -map 0:a:13 -map 0:a:14 -map 0:a:15 -map 0:a:16 -map 0:a:17
-filter_complex "[0:a:0][0:a:1]amerge=inputs=2[a];[0:a:10][0:a:11]amerge=inputs=2[a]"
-map "[a]" -map "[a]"
-metadata:s:a:0 language="eng" -metadata:s:a:0 title="Stéréo - Version Originale"
-metadata:s:a:1 language="fra" -metadata:s:a:1 title="Stéréo - Français"
-c:a output.MOV

My problems :

1. video is not include and audio streams are "inverted"
2. When I execute it, I have these warnings :

[Parsed_amerge_0 @ 000001f8f0340240] No channel layout for input 1
[Parsed_amerge_1 @ 000001f8f0283940] No channel layout for input 1
[Parsed_amerge_0 @ 000001f8f0340240] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
[Parsed_amerge_1 @ 000001f8f0283940] Input channel layouts overlap: output layout will be determined by the number of distinct input channels

How can I fix this ?

I precise that I don't wan't any loss of quality.

Thank you all for your help ;)

Answer 1

Hello erik and thanks for your answer.

Well, I finally (partly) succeeded to get a proper command. I had to precise the codec of the audio streams (MediaInfo).

So now, I have :

ffmpeg -ss 00:00:00.00 -t 00:10:00.00
-i G:\input.MOV
-filter_complex "[0:a:6][0:a:7]amerge=inputs=2;[0:a:14][0:a:15]amerge=inputs=2"
-metadata:s:a:0 language="kor" -metadata:s:a:0 title="Stéréo - Version Originale"
-metadata:s:a:1 language="fra" -metadata:s:a:1 title="Stéréo - Français"
-c:v copy
-c:a pcm_s24le
G:\output.MOV

And it works as expected !!!

The only two small problems I still have :

1. [Parsed_amerge_0 @ 000001f8f0340240] No channel layout for input 1

I just don't know how to set a chanel layout...

2. In the output result, video became stream 3 and not first as it should properly be.

They are not big deals but if I want to be perfect in what I'm doing ;)

Thanks again !!