4K UHD - Alternative audio thread

[BDgeek]

If there's one thing I've gathered from this forum it's that there's no definitive method of syncing audio tracks. Different folks use different ways and the results are always great as far as I can tell. I used to compare waveforms until it was pointed out to me that, when audio tracks are remixed, individual sounds and cues may not be in exactly the same place so where one sound effect lines up, another may not. So I switched to using frame differences in the video streams.

Interesting info on Ultron. Could it be that the missing car sound was mute in the original theatrical mix and was fixed for the UHD? I'll see what different audio tracks I have access to to try and figure it out.

Turisu,

thanks for the information! 

From the little experience I have,  I did notice that sound effects timestamp indeed may vary due to remixes, and in such cases I try to focus on the center channel (of course it would only work when comparing multichannel soundtracks.

I like your strategy to compare frame count, but what tool do you use to showcase the frame number?

But, sync method aside, I'd still like to hear some opinions the matter of a 'tolerable sync range' , do you think delays up to one frame difference (41,7ms) are perceivable lip sync wise? 

I have performed multiple blind tests and I could say I only started noticing delay with a degree of certainty after 20ms. But that's when playing both tracks simultaneously. However for movie lip sync wise, that gap would surely be larger, and I believe up to 40ms could still be safe, as the diference is very small.

I'm looking forward to your opinion on Avengers: AOU, as I cannot recall the sounds were present or not threatrically. 

I know it had an Atmos theatrical soudtrack and it would be great if the UHD indeed presents the original mix.




bendermac,

with the exception of The Incredible Hulk (issued by Universal Pictures) all Disney MCU UHDs are DNRed to some degree and that's very unfortunate. And in that regard, Iron Man 1, 2 and Thor are the worst offenders as they were majorly shot on film.

I can say I'm extremely sensitive to any noise reduction (I sit about 1,7 screen widths way from my display) and even though I haven't checked any of the above yet (they're sitting on a long line of films to catch up : ) I can say that having performed some cautions analysis on The Avengers (2012) and Captain America: The First Avenger I'd say it's pick your poison kind of situation.

While the DNR is easily noticiable for the trained eye, the benefits of the HDR and color expasion are very welcome. The Marvel movies are know to have a bland look altogether and the HDR / WCG works wonders for them.

In the Avengers for exemple, it got rid of the awful green tint that covered the BD image and SFX has benefited greatly from HDR, adding a great deal of realims to the picture.

Anyways, I still have to check out Thor, but I believe the same will apply. I'm looking forward to Turisu A/V assessments.