Official OPPO BDP-83 Owner's Thread [technical talk only] - Page 763

That bugs me too. It's really slow, expecially if you watch a media file (which hasn't any chapters of course). They really should include at least 32x.

It sure seems slow to me.

Maybe I'm just used to the FF on my Dish-TV DVR. It cranks up with each press. Eventually you get to 60 and 300. Not sure what the numbers actually mean, but at 300 you can get through a one-hour recording in about 30-seconds. It is also nice that they show a timeline and position marker as it is scrolling through. I'm not saying the 83 has to have all this (although it would be super if it did), but it seems like scrolling through even at X5 (the fastest setting) is really slow.

When the BDP-83 down-mixes for the stereo analog outputs, are sample rate and bit depth preserved?

For example, the Dave Matthews and Tim Reynolds Live at Radio City BD has three choices: 1) PCM Stereo (48hz/24bit), 2) Dolby TrueHD 5.1 (96hz/24bit) and 3) Dolby Digital 5.1 (640kbps). If the answer to my question is yes, then shouldn't Dolby TrueHD (down-mixed) sound better than native 2ch PCM? Or is there anything in the down-mixing process that effects audio quality?

Have switched between the two, and I think I hear a bit more detail with the Dolby TrueHD choice, but am wondering if my hearing is biased because I read 96 versus 48 on the back of the jacket.

Also, just out of curiosity, is down-mixing a function of the DAC, or a different chip in the player?

Thanks!

Hook

The 2 main differences between any 2-ch and 5.1 over the stereo analog outs will be levels, and the fact that the LFE channel is dropped. Levels because when you down-mix 5 to 2, levels must be lowered. The LFE is dropped because that's the Dolby standard. Likewise the 2 tracks will be mixed differently on the disc for the same reasons.

The downmixing process varies depending on the source. As rdgrimes mentioned, if the source is DD 5.1, the LFE is dropped--and the DRC is activated as well.

If the source is TrueHD 5.1, there is a 2-ch downmix carried within it--which is a linear sum of the total 5.1-ch source. It may contain LFE if the downmixing parameters were set accordingly. This mix is created in the TrueHD encoder, and simply played out as any other 2-ch stream--unaltered by the player. The same sample rate and bit depth as the 5.1 mix is used.

If the source is LPCM 5.1, the player's DSP will downmix it following some preset coefficients built into the player. The player probably retains the sample rate and bit depth, but it's dependent on the player's specific DSP design.

The stereo mix supplied on the disc is undoubtedly a more carefully crafted effort than either of these downmixes, and if I were seeking a 2-ch presentation, is the one I'd select, irrespective of sample rates.

The DRC setting is ignored for the stereo output ?

Is it so in the front left and front right channels output too ?

AFAIK, although BDP-83 cannot play FLAC files, such files can be played when authored into a DVD-A disc, right?

If so, is there any DVD-A authoring program compatible with 32-bit Windows Vista? I have speant a lot of time online to such software to no avail.

BTW, is there such thing like 5.1 FLAC encoded in 24-bit/192kHz? Are there any FLAC files/titles available out there? If not, at least is this theortically possible? There are some FLAC titles in 24-bit/192kHz sold by 2L, but as far as I know they are stereo. They are available in the below link:

http://www.klicktrack.com/2l/search?...+192kHz+24+bit

Hey guys!

Does anyone know if the player can playback media files over the ethernet port? Can it be planned for the future?

Is USB/disc the only method of feeding the files?

Why the hell did they not go full circle and make it streamable, grrr..

/s

Not at the moment.


Anything is possible.


Yes.


It can only be because they hate you.

-Bill

Hi MG428,

I'm more experienced going the other way (DVD Audio to flac) but here's my attempt at answers:

1. After being authored into a DVD-A disc they are no longer FLAC files. Yes the Oppo can play DVD-A discs.

2. I can't make any recommendations about which is better, but for DVD Audio authoring check out WaveLab 6, DiscWelder, or the DVD-Audio Solo program (the sites all mention Vista 32, I'm curious about which DVD authoring software is not compatible with Vista 32?).

Also check out these sites for some software discussions:
- http://www.avsforum.com/avs-vb/forumdisplay.php?f=112
- http://www.quadraphonicquad.com/foru...splay.php?f=41
- http://groups.google.com/group/SurroundSound

3. FLAC supports from 1 to 8 channels per stream. FLAC supports linear sample rates from 1Hz - 655350Hz in 1Hz increments.
- http://flac.sourceforge.net/faq.html#general__channels

4. I'm not aware of *commercially available* multichannel Flac files.

Sorry for my mis-knowledge but AFAIK DVD-A uses MLP, rgiht? So would FLAC tracks be converted to MLP if authored into a DVD-A disc? If not, how does this actually work? And will there be any change in terms of sound quality due to any possible conversion?


Thanks for the links.


This is too techie for me. See my reply to the below question.


Actually 2L has commerically available multichannel FLACs, some of which are free for download. See the below link. Just mouse over to "2L brand store" in the below link and then scroll down to "Test bench HD audio files" for download.

http://www.2l.no/

You will see there that not a single 5.1 FLAC track encoded in 24-bit/192kHz is available. The thing is that 2L might have not made them available, if they actually exist, for free download, and they might be only obtained by purchasing.

As a side note, you mention that you are not aware of commerically available multichannel Flac files. My question here is about whether there exists or can theortically exist a multichannel FLAC track encoded in 24-bit/192kHz.

There must be a better forum for this topic.

-Bill

Juan,

I was able to duplicate this problem this past weekend. I also have a Denon 3808 AVR, using HDMI with the BDP-83, and I have an SACD (dual-format) of Solitudes Birdsongs, good for just relaxing when you don't want music. When I play it first, I get the 5 channel sound (Oppo reads 5.0 on screen), but after I play a Blu-Ray, I get the 2-channel sound unless I change inputs and change back, in which case I also get the multi-channel sound back. Don't know if it did this with 0905.

Audio is stored in DVD-Audio in LPCM format and is either uncompressed or has been losslessly compressed (MLP). This link has more info: http://en.wikipedia.org/wiki/DVD_Audio


Whether you need to use MLP compressoin or not depends on the number of channels and sample rate of your project. From that Wikipedia link:

----------------------------
"The maximum permissible total bit rate is 9.6 Megabits per second. Channel/resolution combinations that would exceed this need to be compressed.

In uncompressed modes, it is possible to get up to 96/16 or 48/24 in 5.1, and 192/24 in stereo. To store 5.1 tracks in 88.2/20, 88.2/24, 96/20 or 96/24 MLP encoding is mandatory"
----------------------------

If your project requires MLP compression and if the DVD-A authoring software does not have MLP encoding functionality (I haven't looked to see if it does or not) then you need to first encode to MLP using something like SurCode MLP.


If you author to the same sample rate and bit depth as your source then in theory there should not be any change in sound quality as LPCM/MLP are lossless.


Yes it does. FLAC supports...
-- 1 to 8 channels
-- sample rate from 1Hz - 655350Hz
-- 4 to 32 bits


Just because FLAC supports 192kHz does not mean it makes sense to use that high of a sample rate. That high of a sample rate means much bigger file with questionable audible difference compared to 96kHz - but that is for discussion elsewhere...



Yes sorry I agree. MG428, if you have followup could you please start a thread at http://www.avsforum.com/avs-vb/forumdisplay.php?f=112 ? Or for specific DVD-A authoring help maybe check out the good folks at the quadraphonics forum (see link in my earlier post). Thanks.

did you look at their test files?

joel

It is interesting this topic has come up. I just finished up watching/listening to Jeff Beck: Live at Ronnie Scott’s [BR].
Seeing upclose, Beck’s guitar playing is mesmerizing. For Audio I could chose between LPCM Stereo and DTS HD MA5.1 & DD5.1. The MA and LPCM had their own nuances. But I think I liked the D2ch. a little better than the MA. I did not test this theory out long enough. Next time I get a BR-CD that has these different selections, I’ll pay a little more attention.
Good technical album but I really didn’t feel a lot of soul in it. I would like to hear this on a different system. No issues at all for either AQ or PQ.
db
Beta Tester #9




Quote:
Originally Posted by ghook2020 When the BDP-83 down-mixes for the stereo analog outputs, are sample rate and bit depth preserved? For example, the Dave Matthews and Tim Reynolds Live at Radio City BD has three choices: 1) PCM Stereo (48hz/24bit), 2) Dolby TrueHD 5.1 (96hz/24bit) and 3) Dolby Digital 5.1 (640kbps). If the answer to my question is yes, then shouldn't Dolby TrueHD (down-mixed) sound better than native 2ch PCM? Or is there anything in the down-mixing process that effects audio quality?Have switched between the two, and I think I hear a bit more detail with the Dolby TrueHD choice, but am wondering if my hearing is biased because I read 96 versus 48 on the back of the jacket.
The downmixing process varies depending on the source. As rdgrimes mentioned, if the source is DD 5.1, the LFE is dropped--and the DRC is activated as well.

If the source is TrueHD 5.1, there is a 2-ch downmix carried within it--which is a linear sum of the total 5.1-ch source. It may contain LFE if the downmixing parameters were set accordingly. This mix is created in the TrueHD encoder, and simply played out as any other 2-ch stream--unaltered by the player. The same sample rate and bit depth as the 5.1 mix is used.

If the source is LPCM 5.1, the player's DSP will downmix it following some preset coefficients built into the player. The player probably retains the sample rate and bit depth, but it's dependent on the player's specific DSP design.

The stereo mix supplied on the disc is undoubtedly a more carefully crafted effort than either of these downmixes, and if I were seeking a 2-ch presentation, is the one I'd select, irrespective of sample rates.
__________________
Roger
Deadwood theater

The user's preference for DRC Off in the menu is overridden when downmixing is selected.


Not sure what you are asking. If a signal is downmixed to stereo, the only active outputs are L/R, and these are affected by DRC. If the downmixing is turned off, the entire 5.1 output responds to the DRC settings of the player menu, On or Off.

Nope because according to the specs provided by 2L, the free multichannel FLAC files are not encoded in 24-bit/192kHz, plus neither my PS3 nor the Oppo is capable of playing FLAC files. Besides, I have just learned that authoring FLAC files into DVD-A disc means changing its format, and (AFAIK) DVD-A cannot include 5.1 tracks encoded in 24-bit/192 kHz. In that case whether or not multichannel FLAC files can theoretically be encoded in 24-bit/192kHz and whether or not the ones sold by 2L are actually encoded like that do not make difference in my setup. In other words, my questions matter only if owned a player that can play FLAC files.


You guys are right. Sorry for the inconvenience.

Further and final update on this issue: I have received the Divertimenti blu-ray/SACD combo. The multichannel Dolby TrueHD tracks encoded in 24-bit/192kHz are properly decoded by both BDP-83, and when bitstreamed, by Denon AVR-988, despite the fact that the AL24 Processing Plus does not kick in. So my theory is proven wrong, and I am happy for that indeed!

No inconvenience to those of us very interested in having the BDP-83 FLAC capable. I already have all my Redbook CDs ripped to FLAC on a 1TB Seagate connected to the BDP-83 waiting for the capability to be enabled - how's that for optimism? (the music is also on the HD in MP3 format as a convenience for quick and "dirty" access to all music to be played on speakers on back patio).

Another annoying thing, hoping in a next firmware fix:

The PLAY,STOP, PAUSE, Next, Back, FF and BF Must Be indipendet and work even if in Setup Screen

For example:
At now, Setting the Speaker in AudioProcessing screen, to play back a track or go to the next I must exit setup screen, play the track I need and back enter in the setup and sub menues to get access again to the parameter to trim ...

Remember that you can use the REPEAT button and select Chapter Repeat before you go into Setup.
--Bob

I downloaded one of their FREE 5.1 Flac files, transferred to a USB stick, my Onkyo 906 can play FLAC format, but when playing these 5.1 files directly from memory stick, the source only shows as 2.1 audio, NOT 5.1, NOT sure why?

Maybe there is an Onkyo thread in the AVR forum.

-Bill

I would have to agree with Highlander on this one.
Quite a few times I have been in SETUP mode and want to apply one of those functions, and having to exit SETUP to do it, then go back into SETUP is very annoying, especially if the adjustment is deep in the menus.

On a similar note, it would be nice if the user could always view the majority of on_screen programing while calibrating the player.
Sure, when adjusting things like brightness and contrast, the picture is viewable, but it's not when switching between something like different colorspace.

For owners of this player does this have issues with the Die Hard 2 bluray DTS-HD MA track that Fox improperly flagged? So sending the signal bitstream to a HDMI 1.3 receiver to be decoded internally in the receiver is there any audio?

I got an Email from OPPO:

The 5x speed is the same as "32x" on competitors products. Any additional speeds will likely not be supported through a firmware release.

Best Regards,

Customer Service
OPPO Digital, Inc.

Myself I couldn't find any test files.

Thanks for posting this - I'll need to contact Oppo too. Mine also came from Amazon with just one disk.