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4K UHD - Alternative audio thread
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BDgeek, could you add a frame calculator reference in the first post?
Like 1 frame = ??? in ms? 10 frames = ??? in ms? 100 frames = ??? in ms? Could be a big help for the less video challenged of us. THX! 
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2019-10-11, 01:30 PM
Guardians of the Galaxy Blu-ray audio to UHD: -12ms
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(2019-10-11, 01:18 PM)Stamper Wrote: BDgeek, could you add a frame calculator reference in the first post? It depends on the framerate of the source. But most movies are approximately 23.976fps. So 1 frame would equal approximately 41.71ms (1000ms / 23.976). Thanks given by: Stamper
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2019-10-11, 03:41 PM
Thor: The Dark World (2013)
Requires no adjustment. BD audio syncs perfectly with UHD video.
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(2019-10-11, 01:30 PM)bendermac Wrote: Guardians of the Galaxy Blu-ray audio to UHD: -12ms I get a 2 frame difference between the video streams which would mean an adjustment of +83ms. Quite a difference. This is using the original 2014 2D BD. I hope there's nothing wrong with the method I'm using. -12ms would mean a difference of less than a single frame. I'd expect the difference to be at least 42ms either way. But perhaps I'm wrong and somebody with more knowledge of such things can put me straight.
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2019-10-11, 06:12 PM
I did a waveform check of each versions center channel. I also checked the final remux and it worked just find. two frames difference are noticeable.
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2019-10-11, 06:18 PM
As my remux is also perfectly in sync with +83ms then there must be a difference between our respective sources. Perhaps somebody else could test and report back.
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2019-10-12, 02:50 AM
Updated the list with the contributions here and some additions of my own.
I'll leave GOTG pending until some further clarification. Stamper, I'll leave the frame reference note in the first post Thanks everyone! Let's keep it up! Thanks given by: Stamper
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I think I may have an explanation for the difference between mine and bendermac's GOTG syncs. I checked out the 3D BD and found that, unlike the 2D BD, the video syncs perfectly with the UHD. So perhaps bendermac's BD source is based on the 3D version. The -12ms difference is probably just a difference in the audio tracks.
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2019-10-14, 10:18 AM
Since I've now satisfied myself that there's nothing wrong with my syncing method. Here's another:
Captain America: The Winter Soldier (2014) Just a single frame difference in the video sources so a +41ms adjustment is all that's needed to sync the BD audio to the UHD. |
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