A source device learns supported audio formats from the connected chain. A receiver, switch or TV setting can change what is reported. If automatic output selects an unusable format, compare a supported simpler mode and inspect the physical chain rather than forcing every codec on. A supported receiver can still be hidden behind a television or switch that reports a narrower capability set. Compare the selected output with the format actually received, and use a compatible simpler mode to establish a working baseline before investigating negotiation.
Check the intermediary
The device directly connected may determine advertised capability. List the physical route and identify the device directly connected to the source. That intermediary participates in capability reporting, so the final receiver's specification alone may not describe what the source learns. Changing an input, television output setting or receiver mode can alter the available options. Record the exact route during the failure, and check the manuals for that arrangement rather than copying codec selections from an unrelated model or internet screenshot.
Restart after changes
A supported reconnection can refresh negotiation. After a documented connection or setting change, stop playback and follow the manufacturers' normal restart or reconnection guidance so the chain can establish fresh capabilities. Do not repeatedly hot-swap equipment during updates or assume the old application's format choice immediately refreshes. Check the menu again after a stable connection returns. If the advertised choices change, note which step changed them; that is useful evidence for identifying an intermediary that was limiting or misreporting support.
Use evidence
The receiver display can show what actually arrives. Read the receiver's actual input information, distinguishing received signal from any listening or upmixing mode applied afterwards. A surround listening label does not necessarily prove that a multichannel encoded track arrived. Compare a supported stereo mode with the problematic automatic selection at moderate volume. If the simpler mode works, report the selected format, received-format display and chain together, rather than forcing every capability checkbox and creating an output the destination cannot interpret.
A practical sequence
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An example to work through
Moving the box from receiver input to TV input changes available audio options. Automatic selection follows the TV's reported capabilities rather than the receiver's full specification. A direct supported receiver connection reports different options, showing why the viewer needs evidence from the actual connection route instead of treating a codec checkbox as a hardware guarantee.
Questions about this topic
Does a codec checkbox prove hardware support?
No. Software may permit a selection that the connected destination or transport cannot actually use.
Should every format be forced?
No. Enable only supported arrangements. Use only the formats supported by the specific equipment and connection route.
