How to record audio on devices where no 3.5mm audio output

cta-wave / device-observation-framework

This repository contains the WAVE Device Observation Framework. The DPCTF Device Observation Framework determines pass or fail results, based on observations taken of tests which are run on a device by the DPCTF Test Runner. DPCTF is the Device Playback Compatibility Task Force of the CTA WAVE Project (https://CTA.tech/WAVE and standards@CTA.tech for more info).

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How to record audio on devices where no 3.5mm audio output #85

Closed yanj-github closed 3 months ago

yanj-github commented 5 months ago

Test and document "How to record audio on devices where no 3.5mm audio output". Possible solutions:

via SP DIP
via HDMI ARC

yanj-github commented 5 months ago

Tested and HDMI ARC can be used. It has same level of PASS/FAIL compared with 3.5mm audio. No delays noticed on HDMI ARC.
SP DIP added some noise to the signal and which caused the audio observation to fail. Not suggested.

jpiesing commented 5 months ago

@Nicholas-fr

yanj-github commented 5 months ago

Document added on wiki: https://github.com/cta-wave/device-observation-framework/wiki/How-to-jointly-record-audio-and-video-(audio-only-%C2%A78-tests-and-%C2%A79-tests)

nicholas-fr commented 4 months ago

Regarding HDMI ARC and S/PDIF out (TOSLINK optical or RCA/coax), aside from some limited exceptions, they usually carry the same digital audio signal, so it should be possible to use either.

The DUT should be configured to ensure that:

The digital audio out is uncompressed stereo (not bitstream).
The digital audio out is configured to be in sync with video (normally the default).
The correct audio output is selected (ARC and S/PDIF outputs can be mutually exclusive on some devices).
If using ARC, both ARC and HDMI CEC functionality should be enabled, as CEC is required to initiate ARC.

Any transients/noise in the recording suggest issues with the setup, but should not be an issue inherent to S/PDIF.

It may be useful to add some of these details to the document.

yanj-github commented 3 months ago

Thanks @nicholas-fr for the comments. Your suggestions are added to the document. As there is no more comments I am closing this issue.