How to jointly record audio and video (audio only §8 tests and §9 tests)
This section describes recording instructions for audio only §8 tests and combined audio and video §9 tests.
- Audio and video shall be captured jointly.
- Video recording shall be set to around 120fps and 1080p Full HD.
- Audio recording shall be set to 48kHz and 16-bit.
- Video capture instructions should be followed carefully (see How-to-take-clear-recordings).
- Audio capture instructions should be followed carefully which is presented below.
- Wired audio recording shall be used.
- With non-wired recording it is difficult to meet the WAVE test requirements: test environment noise and echo will lead to unnecessary failures; it is also likely to cause out-of-sync issues due to the distance between the speaker of the device under test and camera microphone.
- The camera should be tested upfront that it can capture audio and video in sync - see How-to-test-your-camera-records-in‐sync.
- DUT has an audio output: Use 3.5mm audio cable to connect DUT to camera audio-in.
- DUT has NO audio output:
- can be recorded via HDMI ARC: HDMI ARC Audio TV Adapter is required. Connect the DUT to the adapter with an HDMI cable, then the adapter to the camera by 3.5mm audio cable.
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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.