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Old 31st March 2015, 14:16   #1  |  Link
LigH
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A/V receivers are for common media resolutions only?

According to my experience, there are A/V receivers which can only be used as expected with connected HDMI displays and "signal generators" when specific conditions are met. If they are connected to a PC's graphic card via HDMI, it is possible that you won't hear sound for lower resolution video.

Already a while ago, I had some message exchange with the ONKYO customer support. They confirmed that most of their models (specifically I was asking for the HT-R558) will probably only pass video through their HDMI switch and play sound to connected speakers if the video signal matches some resolutions common for consumer media or digital TV broadcasts.

This appears not to be completely true, though. HDMI video passthrough with audio playback also works e.g. with a resolution of 1920×1200 pixels. Instead, there is no audio for 1280×720 or 1280×800. Also there is no audio for low resolution graphic modes common for older VGA compatible full screen games.

Is this a common issue? Is it based on HDMI standards, or rather a decision of A/V receiver electronics ("firmware") manufacturers? Is it possible to recognize models supporting most possible resolutions by reading their specs and looking for specific keywords?
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Old 31st March 2015, 21:46   #2  |  Link
Stereodude
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The audio data is placed in the blanking area of the video signal. If the resolution is low enough enough there isn't room for audio data, or only audio with a limited number of channels or limited sample rates.

1280x720 is a valid consumer video format so I'm not sure why that doesn't work.
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