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Debian's Qt 6 Multimedia is compiled with PulseAudio as its only audio backend (libQt6Multimedia.so.6 links libpulse and contains no ALSA code), so without a running PulseAudio server QMediaDevices enumerates zero audio outputs, QAudioOutput keeps a null device, and every video on a Qt 6 board (pi4-64, pi5, x86, arm64) plays silent. The pre-QtMultimedia mpv path talked ALSA directly and needed no sound server, which is why audio regressed with the migration. - ship pulseaudio (+ pulseaudio-utils for field debugging) in the Qt 6 viewer images - start a minimal per-container daemon as the viewer user from start_viewer.sh; the generated config loads one module-alsa-card per /proc/asound/cards entry with name=<alsa card id>, so the pulse sink names embed the ALSA card name and the existing CARD=<name> matching in VideoView::resolveAlsaDevice (HDMI-port auto-detection, hdmi/local audio_output setting) keeps working unchanged on top of pulse - module-udev-detect finds nothing in a container without udevd, which is why the stock default.pa is not used - update the arm64 audio log message: the 'default' device now resolves to the PulseAudio default sink, not ALSA's ~/.asoundrc Validated on a physical Pi 4 (pi4-64 image): vc4hdmi0 PCM reaches RUNNING with 48 kHz IEC958 samples flowing during video playback, and the AnthiasViewer stream attaches to alsa_output.vc4hdmi0.hdmi-stereo. Fixes #3000 Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>