[Help] DTS-HD MA 21ms delay when muxed on MKV

[BDgeek]

BDgeek, my point to spoRv was that simply muxing does not create the delay, its the initial encoding that creates the delay

Perfect!

I was under the impression that it is something the authoring software needs to 'see' but is discarded which is why DTS-MA tracks from professionally mastered blus do not have the header. Pipefan wrote a lot (a lot) about this so it's probably best to check his threads, also a hex editor would allow you to identify the presence if the header

zoidberg,

I've read pipe's tread, can't say I undersand all of it, but from my understanding of it, he didn't come to a full conclussion. That's what led me to investigate this issue even further doing empirical comparisons. 

While I don't understant about headers and never used a hex editior, what I can atest and offer is empirical data that most comercial DTS releases are about 20+ ms ahead of the respetive Dolby tracks when both are decoded to PCM.

So my guess is that some releases might accout for it, as the one Scavenger mentioned, but on a lot if not most of the cases, studios just ignore it.

[stwd4nder2]

Every once in awhile when watching something I'll get a weird feeling that the audio is slightly out of sync, but not too much where it's obvious at a glance. I usually chalk it down to either a mastering problem with certain scenes or just me. But now I'll have to check whether on not there's a DTS track when this happens

[zoidberg]

There is such a thing as display lag/latency but that is generally a fixed value. Front projectors can have quite significant amounts of lag which can be dialled out with AV receivers.
Just out of curiosity has anyone ever measured lag on hardware decoders such as Blu ray players/AVRs? Most of this discussion is centred on software decoding.

[stwd4nder2]

There is such a thing as display lag/latency but that is generally a fixed value. Front projectors can have quite significant amounts of lag which can be dialled out with AV receivers.
Just out of curiosity has anyone ever measured lag on hardware decoders such as Blu ray players/AVRs? Most of this discussion is centred on software decoding.

For video, I've seen a few people do latency tests with and without passing the signal through an AVR, and it didn't add any additional lag. It could potentially add a ms or two of audio lag but I've never seen anyone test for that. Not even sure if there's equipment for testing audio lag.

[zoidberg]

The main source of lag is the display itself, unless you're using a CRT there's going to be some degree of latency. I was referring to the use of an AVR to cancel the lag, sometimes HDMI can 'sync' separate audio/visual devices but sometimes the adjustment has to be made manually. My DLP projector has 140ms lag!
I suppose what I was trying to get at is when watching a pressed disc on a display or through a sound system, has anyone perceived a delay on DTS-MA content