Bitstream vs. Linear PCM - Page 23 - AVS Forum | Home Theater Discussions And Reviews
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post #661 of 679 Old 08-19-2013, 12:49 PM
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Quote:
Originally Posted by gepetto420 View Post

sorry for ressurecting this thread again. I must be half retarded because I still dont know how i should have my system setup. I dont have one of those expensive fancy recievers you guys have. I just have a piece of **** soundbar (sony ht-c260) because i dont want to disturb my neighbors with a big bad boomy 5.1 system rockin the entire apartment complex. so from my understanding its not a true 5.1 surround so do i use bitstream ? My TV is new (Vizio M-series 55") and i believe it can pass 5.1 anyway. ill be using the TV as a switcher and run an optical audio cable from my soundbar to TV. what would be the best settings to use while watching cable TV ? while playing PS3 ? while watching a blu ray on my PS3 ? Thanks for helping out a noob.

You definitely want to use Bitstream on Blu-Ray and PS3 since you only have a soundbar. You'll only get Dolby Digital and DTS with optical though. If you use PCM with Blu-Ray/PS3, you'll have issues hearing dialogue because the PS3/Blu-Ray Player will be decoding the sound codec which is most likely a 5.1, 6.1, or 7.1 Audio Format and you only have a 2.1 system. How many optical ports are there on your soundbar? I wouldn't use the TV as a switcher for Blu-Rays and PS3. It doesn't sound as good as having your soundbar directly connected to the source. Amazon has optical port switchers for $20.00. I would go that route if you only have one or two outputs on the soundbar.
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post #662 of 679 Old 08-22-2013, 03:56 PM
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I'm getting blu ray audio dropouts on my fat PS3, notice it on the intro to Game of Thrones, I have it set to PCM anyone got some help for me?
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post #663 of 679 Old 09-08-2013, 01:56 PM
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Originally Posted by Ryder125 View Post

I'm getting blu ray audio dropouts on my fat PS3, notice it on the intro to Game of Thrones, I have it set to PCM anyone got some help for me?

What hardware do you have? Depending on what you are sending it to. You may want to use Bitstream and see if that fixes your issue.
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post #664 of 679 Old 01-31-2014, 02:34 PM
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OK, let's see if I can explain bitstream first and then 3/2.1 and keep it to two or three paragraphs instead of multiple pages.
posted elswhere by alk3997. By far, he provided the best answer.. Set your output to Bitstream!


When you purchase a disc (or a file), the audio encoded on the file is in a certain format. It can be stereo PCM (where PCM is just a way of saying that the numbers on the disc match the audio levels to generate) or it can be multichannel. Multichannel is an easy way for me to say 5.1 channel or 7.1 channel or anything greater than stereo.

When you select bitstream, you are telling the OPPO to send out the audio in the exact format it is on the disc or the file. So if the disc is encoded in Dolby Digital, the OPPO will send Dolby Digital. If it is encoded in DTS, it will send DTS.

If you select LPCM, then the OPPO will decoded whatever format is on the disc, convert it to stereo PCM and send that instead. So if you want DTS or Dolby Digital, you have to tell the OPPO to send out bitstream. The PCM option is great for people with stereo TVs that have digital audio inputs.

It's a hair more complicated with Blu-Ray audio but that's the general idea.

3/2.1 is actually even easier. The first number is the number of front channels (3 = left front, center, right front). The second number is the number of back channels (2 is left surround and right surround) and the .1 is how many LFE channels you are using. The LFE is a bit more complicated because number of LFE channels does not equal number of subwoofers, but a .1 indicates that there is a single LFE channel that is supposed to go to a subwoofer. So, 3/2.1 is an exact match for 3 front speakers, 2 rear speakers and a subwoofer. It's a long hand version of 5.1.
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post #665 of 679 Old 06-09-2014, 09:05 AM
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I was experimenting with the HDMI audio out setting on my PS4 last night for the game Watchdogs. I noticed something I thought was a bit strange. If I select bitstream option on the PS4, I can press the info button on the receiver and it will show the input signal (5.1 Dolby Digital, and the speaker output setting and listening mode, 9.1 DTS Neo X in my case). What I thought was strange though was that if I switched to the linear PCM option on the PS4, when I pressed the info button on my receiver it showed the input signal as 7.1 Multichannel PCM.

 

So it would seem that for this game you get a completely different audio format input to your receiver depending on if you choose to bitstream or send linear PCM to the receiver (5.1 channel audio for bitstream and 7.1 for LPCM)

 

Anyone have any ideas on this, as this seems rather atypical to me.

 

(duplicated post in watchdogs PS4 forum as well as this thread is a bit old)

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post #666 of 679 Old 06-11-2014, 12:04 AM
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Originally Posted by thebigdaddye View Post


since no one has answered the question which is better bit stream or PCM, i will answer it for anyone that wants to know. pcm is better , it is loss less audio and it's the way the original is supposed to sound. typically DD double digital which is sent bit stream is around 600 kb and pcm loss less is usually sent around 5.0+ mbs . the pcm track will be much clearer and more i guess defined when compared to double digital, but you must have a receiver that excepts pcm audio like my onkyo tx-sr604. you can clearly hear a difference between DD vs PCM and pcm is better. hope this helps

No one has mentioned SACD yet......

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post #667 of 679 Old 01-14-2016, 03:42 PM
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Question

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Originally Posted by TornadoTJ View Post
Quote: Originally Posted by TornadoTJ

I had 2 phats, now have 2 slims. Sound is exactly the same, and I have a fairly nice home theater setup (Pio 1021, Boston Acoustic mains, Outlaw LFM-1 EX sub, etc.) Placebo effect at best. Maybe it's just that you can HEAR the audio now instead of the old phat's fan!


Agreed. And I have that same receiver and sub. I even used to have Boston mains, but they've been moved to my computer's sound system. Not that there is anything wrong with my Bostons, they are wonderful, but I got new mains and I work from home, so using the Bostons in here.
Never ending tread.......hope someone will see my post.

4 years ago a buy my firts BD player (Sony) and 7 BRDisc with a sony A/V DR 985 (2002) with optical in for sound..... 7:1........4 of the

BD did not work............my blue lignt above the display was blinking and sound for seconds to seconds. sometime the display was PCM and it was working but the sound was not good.

the other 3 where OK

i did not notice the audio formats on the BRD ; dts true hd ...... on display and saw 5 little speakers icon on the display and the LFE bars was jumping with big action scene) ( after review the forum JUST yesterday......hi saw the lpcm and bitstream thing. FOR THE FIRST TIME)

so 4 years ago a i change (for nothing) my BDP for a Panasonic.....with no problems. (Optical too)

at that time was not 100% sure that is was the receiver..

1 week ago i buy on sale at BB a Sony STR-DN 1060 with HDMI inputs roblem solve.

on these new A/V there are no little light and speaker icon on display......... but i see all those DD sound output..ALL that exist... on a rolling right to left...banner sort of speak.

problem solve........i was happy.

but yesterday i saw that tread.and did go to my BRplayer i change all all bistream to pcm,

so now i see on my rolling display : Linear PCM 3 / 4 .1 ...96 htz.

Q.:1 so it is lpcm 7:1 ? right or....

btw on Avatar BD on set up/ Laguage menu : they are a rare 7 lines notice by James Cameron that say the film was made with a original DTS 5.1 soundtrack like the film.......so it must be play like this.

can someone comment on this?

Q.:2 it not a xbox or playstation
: so il leave the setting at LPCM? RIGHT?

Thanks guys

maybe i post in wrong place sorry mods

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Last edited by franky932; 01-14-2016 at 09:59 PM. Reason: double post
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post #668 of 679 Old 01-14-2016, 09:44 PM
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Franky, one thing to keep in mind when selecting PCM in the player (letting the player decode the soundtrack), you may notice a loss of bass impact. A few years ago, it turned out that receivers were applying correct +10 dB bass emphasis when doing the decoding of DD and DTS movie soundtracks, but not when receiving PCM. I don't know if this has changed or not, but it's something to listen for. Some early BDs such as my copy of "Bram Stoker's Dracula" had discrete PCM soundtracks on the disc along with the DD or DTS soundtrack.
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post #669 of 679 Old 01-14-2016, 10:04 PM
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Quote:
Originally Posted by Rolls-Royce View Post
Franky, one thing to keep in mind when selecting PCM in the player (letting the player decode the soundtrack), you may notice a loss of bass impact. A few years ago, it turned out that receivers were applying correct +10 dB bass emphasis when doing the decoding of DD and DTS movie soundtracks, but not when receiving PCM. I don't know if this has changed or not, but it's something to listen for. Some early BDs such as my copy of "Bram Stoker's Dracula" had discrete PCM soundtracks on the disc along with the DD or DTS soundtrack.
thanks for the info............ i was on a old tread..........merci mon ami

je vais remettre at bittstream correct?

mets tu ton film a PCM quand c 'est sur le BD

j'ai remarqué d'autres choses dans video settings j'ai le choix entre 24 p output a off ou on.......... car ça dit qu'il y a des films en 60p....as tu ça sur ton BD player?

Merci

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Last edited by franky932; 01-15-2016 at 04:22 PM. Reason: miss
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post #670 of 679 Old 01-15-2016, 04:23 PM
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Originally Posted by franky932 View Post
thanks for the info............ i was on a old tread..........merci mon ami

je vais remettre at bittstream correct?

mets tu ton film a PCM quand c 'est sur le BD

j'ai remarqué d'autres choses dans video settings j'ai le choix entre 24 p output a off ou on.......... car ça dit qu'il y a des films en 60p....as tu ça sur ton BD player?

Merci
not speak french?

TY

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post #671 of 679 Old 01-15-2016, 04:25 PM
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notification off.........soory for that extra post

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post #672 of 679 Old 01-15-2016, 04:56 PM
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not speak french?

TY
No, sorry. Your English is FAR better than my French...

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post #673 of 679 Old 01-15-2016, 07:30 PM
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Originally Posted by Rolls-Royce View Post
No, sorry. Your English is FAR better than my French...
Q.:1 so it is lpcm 7:1 ? right or....

btw on Avatar BD on set up/ Laguage menu : they are a rare 7 lines notice by James Cameron that say the film was made with a original DTS 5.1 soundtrack like the film.......so it must be play like this.

can someone comment on this?

Q.:2 it not a xbox or playstation
: so il leave the setting at LPCM? RIGHT?

Thanks guys

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post #674 of 679 Old 01-16-2016, 09:12 AM
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The PCM soundtrack was 5.1, as was the Dolby Digital soundtrack. 7.1 soundtracks didn't exist at that time.
Personally, I'd prefer to let the receiver do the decoding.
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post #675 of 679 Old 01-16-2016, 11:57 AM
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Originally Posted by Rolls-Royce View Post
The PCM soundtrack was 5.1, as was the Dolby Digital soundtrack. 7.1 soundtracks didn't exist at that time.
Personally, I'd prefer to let the receiver do the decoding.
Thanks...........

and for the video (BD Player): 2 choice 24P yes or no .......and 60P

Cya

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post #676 of 679 Old 01-16-2016, 11:58 PM
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If your TV can handle 24p, by all means select that. In that case, the player will usually still output video-based programs such as concert Blu-Rays at their native 60p.
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post #677 of 679 Old 01-17-2016, 01:01 AM
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Originally Posted by Rolls-Royce View Post
If your TV can handle 24p, by all means select that. In that case, the player will usually still output video-based programs such as concert Blu-Rays at their native 60p.
Ok it is late...........i know my Tv is full hd 1080P :so i will go to check specs tomorrow

TYVM

hi l be back

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post #678 of 679 Old 01-20-2016, 06:51 AM
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Originally Posted by franky932 View Post
Ok it is late...........i know my Tv is full hd 1080P :so i will go to check specs tomorrow

TYVM

hi l be back
It depends on what your TV is going to do with it, too. Some will just convert it to 60hz, which puts you right back where you were. Some convert to 120. Mine convert to 96hz (Panasonic plasmas), which works great since it's just flipping it up on the screen 4 times with no conversion at all.
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post #679 of 679 Old 01-20-2016, 12:23 PM
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Originally Posted by TornadoTJ View Post
It depends on what your TV is going to do with it, too. Some will just convert it to 60hz, which puts you right back where you were. Some convert to 120. Mine convert to 96hz (Panasonic plasmas), which works great since it's just flipping it up on the screen 4 times with no conversion at all.
No option for that on my samsung

TY

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