Keep count and meaning separate
A six-channel asset has a count, but the count does not establish the identities or order of those channels. Before processing an owned production, obtain the source layout record and the tool's expected interpretation. Unspecified layout information should stay visibly uncertain.
FFmpeg's channel-layout utilities distinguish speaker identities and order representations. That is why a technical inventory needs more than a field saying six. A wrong map can send meaningful material to the wrong place before any later downmix calculation begins.
Preserve recorder settings, export documentation and any reliable channel-identification material. Listening is useful, but a quiet channel during one passage may still have an intended role that becomes active later.
Use a meaningful sample
Choose an authorised passage containing dialogue, ambience and a channel-identification section if the production has one. Review the mapped source before changing its mix. Keep the monitoring route fixed so an output change does not obscure an input-map correction.
An imagined training production carries its main instruction in the centre channel. A mistaken map can affect both surround listening and a later stereo derivative. Raising every channel's gain does not correct the underlying identity problem.
Record the accepted source map and output map with the derivative. If evidence cannot establish the order, preserve the source and ask the production owner for that missing fact through the normal workflow. Do not label a guessed layout verified merely because it produces sound.
Questions answered
Can the number six distinguish every surround arrangement?
No. Channel role and order need separate evidence.
Does a silent sample prove a channel is unused?
No. Review relevant material and source documentation.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.