Blu-Ray 5.1 DD SS Audio Glitch after import into Encore.

Working on burning a full length blu-ray with two audio track options (stereo audio, 5.1 DD SS) I'm not having any problems connecting menu's or burning. After the initial burn everything was working flawlessly except when I played the video with the 5.1 DD track I noticed the audio would glitch at certain parts. The glitch sounds like a CD skipping (i.e the speaker would say Bubble and it would sound like Bu-Bu-Bubble) the audio doesn't go out of sync when this happens, it's small and the video keeps playing but it's still noticeable and an issue.
Both audio tracks are one complete track, no cuts or seperate clips. The 5.1 track is .ac3. The stereo track is mixed from the 5.1 track and doesn't have the glitch at all. I've gone back and checked the source audio and haven't noticed any transients or spikes at the places where it glitches. The problem occurs when I pull it into encore. Even before burning the audio will error inside the timeline preview. I'm not transcoding the audio or video at all as I have manually compressed the video already. Everything is perfect except for this glitch and I'm all out of ideas of what Encore is doing to the audio to create the skipping glitch any thoughts or ideas would be great. Hope i've given enough information. I'm new to the forum so please let me know if i've left anything out or missed any etiquette.
My system:
Encore CS4
FCP 7
Mac Pro 2 x 2.93 GHz Quad-Core Intel Xeon
12 GB Ram
10.6.6 OSX

CalebMonroe wrote:
neil wilkes wrote:
the_wine_snob wrote:
To Encode the DD 5.1 SS AC3, what program did you use, perhaps the SurCode plug-in for PrPro?
What is the Bit-Rate of the DD 5.1 SS AC3?
What is the brand of the blank media?
Good luck,
Hunt
Most likely he used Apple's Compressor, Bill - the system specs state FCP7 is being used.
Bitrate is a valid question though.....this should be no higher than 640kbps (and IMHO certainly no lower - DD sucks at the best of times)
Sorry for the long reply back guys. We had the audio work for this project outsourced so I had to await details to your questions. The bitrate is 457.67 kbps so the bit rate shouldn't be causing the issue. The audio was completely pre mixed in Pro Tools and they just sent us a ready to use .ac3 file. Hope this helps!
CAleb
Hey Caleb.
Thanks for the details -and that is probably your problem.
457.67kbps is nothing like DVD-Video compliant, and almost certainly not BluRay compliant either.
For BluRay, you should be using 448 or preferably 640kbps.
DVD uses either 448 or 384kbps Dolby Digital, and the figure you are giving is extremely odd, looking almost like a VBR encoding which DD should never, ever be. Using 384 gives you unidirectional content above 10kHz (IE, mono) and 448 gets it all the way up to around 14 or 15kHz before it goes unidirectional. In all frankness, there is no good reason at all to use Dolby Digital as it sucks - badly - and all BluRay players are required to decode at the very least DTS Core Audio (1536kbps) which is fully discrete all the way to 20kHz.
I think whoever you outsourced this to got the DD encoding wrong - simples!

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