Samsung LE32C650 DTS passthrough

[mk01]

why you are connecting RPI -> TV -> AVR? the standard way is that AVR is HUB receiving all inputs and connected via one HDMI to TV.

passthrough audio then stays within AVR and video is going out via HDMI to TV. to watch TV or other media source on TV (like Samsung smart), there is a configuration option on the yamaha and support on Samsung to utilize the same HDMI for sound in reversed stream. Its called ARC and on yamaha it's HDMI1 only. Normally the inputs are managed by TV (remote) via CEC to Yamaha (AVR can by turned off). If you changes input on TV to Live TV or other input (Smart), it sends CEC signal (if needed to turn AVR on / change input).

If you use the TV wrongly as hub for everything, audio will be always just Stereo. If the TV does not support ARC, special input on AVR Yamaha can be set for audio TV in if the signal is reversed. And if then TV is watched, AVR automatically activates this special audio input.

HDMI cabel needs to be HDMI 1.4

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the signals needs to be routed via AVR, not TV. that's it's function. TV connected via HDMI. then it will properly passthrough. to route audio back to AVR from TV or Smart, use ARC via the same hdmi out (hdmi 1.4 kabel needed), or additional spdif. AVR yamaha will switch to it automatically if on TV is changed input / TV / Smart.

AVR is the center, not TV. it's their primary function. Then you can check from RPI 'tvservice -a' what are available streams.
While you have yamaha, you will read
PCM supported: Max channels: 8, Max samplerate: 192kHz, Max samplesize 24 bits.
AC3 supported: Max channels: 6, Max samplerate: 48kHz, Max rate 640 kb/s.
DTS supported: Max channels: 7, Max samplerate: 96kHz, Max rate 1536 kb/s.