Possible Source for Audio Sync

[Capsbackup]

I have recently experienced some audio sync problems when making full movie backups to BD-25 and keeping HD audio using BD-RB. I have done quite a few BD-5 backups and never had this issue, but I was using either the 640kbps AC3 audio track off the original or let BD-RB create a 448kbps AC3 audio file.
Since BD-RB and tsMuxer began supporting HD audio, I have been experimenting with it and BD-RE and BD-R media for full movie backups. I was not happy with this audio sync issue, even though it is only slightly off, it is noticeable.
I have been using my 5 year old Onkyo receiver that only has analog inputs as well as digital coax and optical inputs. I was using the optical for my 5.1 audio. So I tried the digital coax, but the results were the same.
So I tried just using the HDMI cable from my Sony BDP-BX1 to my Pioneer Elite plasma with the speakers that came with the Pioneer, and the audio sync is gone. Perfectly in sync!
I had become quite frustrated trying to figure this problem out, reading many posts from others, and not seeing anyone else reporting audio sync problems. Of course I did not suspect this receiver to be the issue, but it appears to be my source!
Has anyone else had this type of experience?
Could HD audio require HDMI receivers and cables to provide the proper signal to prevent audio sync issues?
I am really curious if others have noticed such an issue.

[deank]

How do you play HD audio via coaxial/optical connection? It doesn't have the required bandwidth to pass HD audio (be it DTS/TrueHD/LPCM). It is possible that your receiver (just like mine does) tries to use the core and is too slow to keep the sync, so you have the async.

HD audio playback can be achieved only with HDMI connections from HDMI sender to HDMI receiver. Otherwise it is downsampled/downconverted to something else.

At least I think so :)

Dean


edit: You have a good receiver if you get away with the lipsync issue only. I'm using Pioneer receiver which outputs stuttering audio via optical when I try HD streams :)

[Capsbackup]

@deank;
I tried both coaxial and optical out of my BDP-BX1, since it has both, as does my Onkyo HT-R8230, but results were the same for both.
It is possible that your receiver (just like mine does) tries to use the core and is too slow to keep the sync, so you have the async.
This does seem valid, which I suspected, but was wondering if anyone else noticed.
Other than the async on HD audio (DTS/TrueHD/LPCM) it has been a good receiver. It plays back Dolby Digital 640kbps perfectly.
I am a little annoyed at the less than perfect audio sync, and am more aware of it now than ever. ( I cant help but look for it!! )
Should a decent HDMI receiver keep audio in sync?

[deank]

Yes, you need a new HDMI receiver.

Mine also has optical and coaxial but neither will carry HD audio, not any other receiver will (they will TRY but you won't get what you expect). Don't be annoyed and angry :) - it is normal.

Either keep 640kbit AC3 (which I think is a good way to go) or spend some money on HD capable receiver.

Dean :)

[drmih]

I go for the 8 analogue outputs into my Denon. Never have an issue, although because I'm using direct in on the amp there is no facility to process the signal. However, you can get a box which takes a hdmi signal and splits it into optical parts to input into top end amplifiers. My friend has one and I think it was about £100.

I'm not sure if this is the thing:

http://cgi.ebay.co.uk/HDMI-LPCM-Dolby-To-Optical-Multi-Channel-Audio-Adapter_W0QQitemZ310141285720QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4835dc7558&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1683%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50

[Mr. Movies]

I have the BDP-BX1 too and I’m using a Yamaha RX-V2400 receiver which doesn’t directly support True & Master audio but does support DTS/AC3/LPCM streams and have not had problems with sync issues. I too use optical cable for my audio from the Sony but could use HDMI as my receiver will support that also. The only sync issue I’ve had is fault of BD-RB and not my player/receiver which I’m still working on. I can play HD audio through my receiver using the optical link and it plays perfectly.

The only problem I’ve had was with a 6ch PCM BD that only 2ch’s were decoding but the audio was in sync the sound was shallow with out all 6ch’s. I used the AC3 instead and all was good.

[deank]

So you play HD audio via coax/optical?

Don't mistake "listening to a quality audio output" with "HD audio".

You can't get HD audio pass through coaxial or optical in its real bitrate or quality, so don't foul people.

Dean

[Capsbackup]

I have purchased a new Pioneer VSX-1019 AH-K receiver, and my audio sync issues appear resolved, or are not apparent on the brief testing with the same discs as before. I was a bit skeptical at first to try a new receiver, because after testing the original retail discs, the audio sync problems were not present, or at the very least, slightly off. The BD-RB backups, with HD audio, were more noticeably async when played thru the Onkyo HT-R8230 receiver and either digital coax or optical cables. So after numerous BD-5 backups with 448kbps and 640kbps AC3 and never a visible audio sync problem, I wanted to know for sure. The BD-25 backups with HD audio were in question.
More testing to follow, and of course as time becomes available, I plan on watching several of these backups completely, rather than just skipping thru and looking for audio sync.
A Google search also confirmed that many other people have audio sync issues with Blu-Ray players, and HDMI 1.3 should help overcome these issues.
So I believe I might be on the right track for my problems. :confused:
Of course, time will tell. :p

[Mr. Movies]

So you play HD audio via coax/optical?

Don't mistake "listening to a quality audio output" with "HD audio".

You can't get HD audio pass through coaxial or optical in its real bitrate or quality, so don't foul people.

Dean

@deank
Who is mistaking, certainly not me but also you should not mistake a spec versus the media transport capability of optical or coax transmitting lines, however RG59 would not be suitable for high bandwidths. Easily optical transports are more then capable of facilitating Master or True HD audio signals and could do a better job then 28 or 24ga COAX HDMI cables use it just isn’t spec’d for it mostly because of the copy protection, HDCP, they so much love for HDMI transport.

@Capsbackup
Way to go with the new amp and your right many people have had sync problems with Blu-Ray and HDMI v1.2 and prior, current spec is to v1.3b1 and uses the CEA-861-D video standard which defines the video timing requirements, discovery structures, and data transfer structure.

I'm glad I don't have the problems you have had as I really don't have $2K to replace my amp right now.

[GaPony]

You don't need to spend anything remotely close to $2k to get a high quality amp or receiver capable of handling the different HD audio standards.

[Capsbackup]

I wish I had $2K to spend on an amp. My home theater ( family room :p ) would not justify this type of sound system. Spent $429.00. :)