On Tue, 24 Jan 2023 00:02:19 +0000, NY <
[email protected]> wrote:
On 23/01/2023 21:11, charles wrote:
In article <[email protected]>,
AnthonyL <[email protected]d> wrote:
Is it the BBC or my broadband connection but there is quite a
difference on programmes I watch between the sound coming out of the
mouth and the mouth moving?
Very disconcerting.
On my tv they are in sync, but if I listen on my hearing aids, which
connect by Bluetooth, there is a noticable error.
That is a standard problem with Bluetooth audio devices. I have some
earbuds (in-ear headphones) and they have about 200 msec delay: that's
the amount of picture delay that I have to enter into VLC to bring the
sound and picture back into lip sync. It's a shame that other devices
such as iPlayer and TVs don't have the ability to enter a picture delay
for use with delayed-sound devices such as Bluetooth headphones.
In my case it's the other way around - the sound is early. I feed HDMI
to the TV set to display picture only, and use an audio extractor that
decodes analogue sound from the HDMI stream and feeds it to an audio
amplifier. I have an adjustable audio delay in the analogue feed that
needs to be set to about 130ms for synchronisation to appear correct.
I've recently acquired a bluetooth transmitter for headphones, and if
I connect it before the delay, the sound appears in sync, suggesting
that it's actually early at that point and the Bluetooth processing is
delaying it so it sounds correct on the hedphones.
Rod.
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