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Audio lag using Dolby Digital Live

post #1 of 2
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I'm currently using a Sound Blaster recon 3d with an onkyo ax380 reciever connected with an optical lead. Now in the settings I have dolby digital live enabled which asks me to use speakers as the default device in the windows sound panel.

The issue is ive noticed audio lag in videos and movies in every media player ive tired including embedded videos. If I disable the settings and just choose spdif-out as the default option then blu-ray movies play over dolby fine as powerdvd does the work however normal videos and music don't sound as good as they only play in 2 channel PCM with no other options to change it.

Is there anything I can do or am I just gonna have to keep switching between settings for different things?

Screens if the help:

449

340

EDIT: Using vlc's track synchronization option ive worked out that its a 0.100s delay as doing -0.100s (hastened) puts the track into perfect sync with the video. I know the number sounds low but I can tell that its out of sync when people are talking.
Edited by Shadow of Intent - 5/12/12 at 4:21pm
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Cryo-Stasis
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OCZ Vertex 2 90GB -- 1TB Caviar Green x 2 -- 50... LG BH-10 Blu-Ray Drive XSPC Raystorm Windows 7 Home Premium 64-bit 
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post #2 of 2
That's a very astute observation my friend- most people don't notice the delay with DDL and DTS Connect. Dolby describes the DDL feature as "realtime" and "without perceptible delay". The former is false if we're talking about real-time DSP (if it doesn't happen 'instantaneously', it isn't "real-time")- and the latter is completely dependent on the listener.

I've measured as much as 150ms of delay when using Dolby Digital Live, and there's precious little you can do to fix it. Going to invest in an HDMI receiver with 7.1 analog inputs soon. I don't know if using your GPU's HDMI audio solution offers any improvements in latency, so the 7.1 analog inputs will be handy if all else fails.

I posit that the huge latency induced is due to some ancient processing power constraint- if your hardware can't encode the streams quickly enough- you'll get crackling due to buffer underruns and whatnot. They probably figured (like 7 years ago) that >100ms was a good number to ensure that no one ever runs into that issue, and left it as such ever since. Bollocks if you ask me.
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