quick BD Audio setting question

[MrT.]

Afternoon everyone.
I have done 10 or so BD (BD50 to BD25), but never looked into the settings/setup, and am now just noticing the audio options.
My question is this: If I want to keep the Master Audio track intact without making any changes to it, what options do I need to put a check mark next to?
Do I put a check mark next to "Do not convert DTS to ac3" and " Keep HD audio for BD25 encoding"
Or
Do I just do " Keep HD audio for BD25 encoding" and that will make the first option not matter?

[jdobbs]

Afternoon everyone.
I have done 10 or so BD (BD50 to BD25), but never looked into the settings/setup, and am now just noticing the audio options.
My question is this: If I want to keep the Master Audio track intact without making any changes to it, what options do I need to put a check mark next to?
Do I put a check mark next to "Do not convert DTS to ac3" and " Keep HD audio for BD25 encoding"
Or
Do I just do " Keep HD audio for BD25 encoding" and that will make the first option not matter? The switches have a different impact depending upon your output selection. You also have to remember that because of its huge size, LPCM is treated differently

If doing output greater than BD-9 (e.g. BD-25):

1. Default (all audio options unchecked)
---- All audio is converted to DD AC3. Bitrate is 640Kbs for 5.1 and 224Kbs for 2.0.
---- All 7.1 sources are down-converted to 5.1
1.1 448Kbs selected -- 5.1 = 448Kbs, 2.0 = 224Kbs
1.2 192Kbs selected, all sources down-converted to 2.0

2. "Keep HD" overrides all other audio settings. If selected:
---- DTS HD keeps a bit-for-bit copy of the original audio
---- DD HD keeps a bit-for-bit copy of the original audio
---- LPCM keeps a bit-for-bit copy of the original audio
---- You may get failure due to inadequate target space if much LPCM is used

2.1. If you use "Keep HD" and also add "KEEP_HD_LPCM=0" as a hidden option:
---- LPCM is converted to AC3 at a bitrate determined by other audio selections
---- Other audio is bit-for-bit copies of the original

3. "Do not convert DTS" checked: When the source is DTS, DTS core is extracted and used intact (bit-for-bit).

4. "Do not reencode AC3" checked: When the source is Dolby, the Dolby core is extracted and used intact.

If doing BD-5 or BD-9:

1. Default (all audio options unchecked)
---- All audio is converted to DD AC3. Bitrate is 640Kbs for 5.1 and 224Kbs for 2.0.
---- All 7.1 sources are down-converted to 5.1

1.1 448Kbs selected -- 5.1 = 448Kbs, 2.0 = 224Kbs
1.2 192Kbs selected, all sources down-converted to 2.0

2. "Do not convert DTS" checked and full-backup, or movie-only and "Strict AVCHD" is not checked: When the source is DTS, DTS core is extracted and used intact (bit-for-bit)

3. "Do not reencode AC3" checked and full-backup, or movie-only and "Strict AVCHD" is not checked: When the source is Dolby, the Dolby core is extracted and used intact.

4. LPCM is always converted to AC3.

5. Keep HD is always ignored.

6. Setting "OVERRIDE_AVCHD_AUDIO_LIMIT=1" in the INI will allow strict AVCHD to also use DTS.

Important note: Choosing to keep DTS on an AVCHD source violates the AVCHD standard and can result in a disc that will not play on some players. It is highly recommended that DTS is converted to AC3 for BD-5/9 movie-only encodes.

[MrT.]

jdobbs, thank you very much for this, exactly what I needed.
I'll check "keep HD" for now, and if I get any failures I'll convert LPCM to ac3.

By keeping the original HD audio/LPCM, would that worsen the video quality any? If so, would high quality help.
Or is bd-rb preset with setting to avoid bad video quality, which would result in this (You may get failure due to inadequate target space if much LPCM is used)

[jdobbs]

Keeping HD will always reduce the available space and therefore the bitrate of the video. Usually BD-25 is large enough that it doesn't show... LPCM, though, can be the exception. A single 7.1 LPCM audio track for a two hour movie might take 8GB all by itself.

Yes, "High Quality" will always help, at the expense of encoding speed.

[MrT.]

wow :/
Thanks for that. I will give it some thought on a BD to BD basis :)
ty for bd-rb, it is great.

[MrT.]

hi, I have another quick audio question.
I have a blu-ray that has 2 English dts tracks,, and I just want the 5.1 track and not the 2.0.
is the 5.1 DTS track labeled as DTS-HD XLL, Multi-ch or DTS-HD XLL, stereo?
Hope for your help :)

[jdobbs]

5.1 would always be listed ast "Multi-ch", while 2.0 would be listed as "Stereo". Multi-Ch could also include 7.1 sources...

[MrT.]

ok, thanks very much jdobbs