How to reencode LPCM track in fullBD

[carrascal]

Hi,

I have a decrypted fullBD (BDMV folder) that features two Lpcm tracks (2.0 and 5.1). My multimedia player is connected to an old AVR over spdif, so it is not possible to listen to the 5.1 track.

I am wondering wether is possible to reencode the lpcm 5.1 track to a lossy format (dts/dd/ac3 ?) keeping BD menu functionality. And, of course, how to do it. I guess it should be quite easy, but I am no familiar with the sofltware tools used for audio/video editing.

This is a music BD so I'd like to keep the sound quality as high as possible.

Thanks in advance for your answers.

Best Regards and Happy New Year

[jman98]

No, it's not possible for consumers to replace audio tracks in BD rips and retain menu functionality. With DVDs you could use muxman to generate a new VOB file with new audio and use VOBBlanker to replace the original VOB file with your new one and retain all menus. I'm not aware of any such tools for BD rips. If you're desperate enough to give up the menus you could use something like tsmuxer to create a new BluRay format disc with no menus using your new audio file and the old video file but that's all I can think of.

If you live in the USA or Canada, the website http://www.woot.com sends out daily emails of various one day sales they have. About once every 3 months or so they put a receiver on sale that supports DTS-MA and Dolby Lossless. It can also handle LPCM multichannel and older formats (ie. DTS, AC3, etc.). I've got a Denon model they put on sale that way. It cost me about $150 and it was totally worth it. They will ship internationally, but depending where you live there may be issues with additional costs and possible customs problems. You may wish to join their daily email list so you can wait for the next sale on receivers.

[fritzi93]

Try running it through BDRB, it can convert LPCM 5.1 to DD 5.1 (AC3). Default audio output in settings is AC3, 640 kb per sec if you deselect save HD audio.

If your folder is already small enough for a BD25, it will re-encode only the audio. I believe there is also a force no re-encode option in hidden options config file. But I'll have to check that.

Happy New Year!

[jman98]

Try running it through BDRB, it can convert LPCM 5.1 to DD 5.1 (AC3). Default audio output in settings is AC3, 640 kb per sec if you deselect save HD audio.

If your folder is already small enough for a BD25, it will re-encode only the audio. I believe there is also a force no re-encode option in hidden options config file. But I'll have to check that.

Happy New Year!

I have never used BDRB to re-encode audio so I completely forgot it could do this. This is the best idea for the original poster.

[carrascal]

I will run my backup through BDRB.

Anybody experienced with the program can tell me which are settings I have to care about?. I just want to reeencode the audio and leave the video as it is.

Thanks for your time.

Best Regards.

[fritzi93]

You'll need specific versions of Avisynth, ffdshow, and haali splitter; get them here:

http://forum.doom9.org/showthread.php?t=143716

Also read the instructions on how to set it up. Read carefully and refer to the instructions at each step.

It would help if you filled in your computer details. I'm going to assume you're using Win7. If so, when you run BDRB for the first time, instead of left-clicking the executable, right-click it and select "Run as Administrator". BDRB will then offer to configure your auxiliary programs for you (Avisynth, ffdshow, haali). If you're using XP, you'll need udfreader.

In settings, deselect all *audio* options. That will leave audio at default, i.e. it will encode the audio as AC3 5.1 640 kb/s for your LPCM 5.1 track, and AC3 2.0 192 kb/s for the other one. In output size, select BD25 (single-layer BDR).

To keep the video as-is, that is, to force a re-encode of the audio *only*, add the following line to the BDRB config file:

FORCE_NOENCODE=1

Although if your project is already under BD25 size you don't need to add the above to the config file.

Come back if you have any more questions.

Good luck and welcome to the forum. Happy New Year!

[carrascal]

In settings, deselect all options. That will leave audio at default, i.e. it will encode the audio as AC3 5.1 640 kb/s for your LPCM 5.1 track, and AC3 2.0 192 kb/s for the other one. In output size, select BD25 (single-layer BDR).

I have followed your instructions and I was able to run the backup through BDRB. I still have to check that the results are OK, but there is something not clear to me. As you said, the stereo track was encoded at 192 kb/s, but I expected a 224 kb/s rate instead, since I had read the following in the BDRB version history:

"Reencoding will now be done at 640Kbs for 5.1 (rather than 448Kbs) and 224Kbs for 2.0 (rather than 192Kbs)"

Why 192 instead of 224?

Thanks in advance.

[fritzi93]

It seems my recollection was at fault there. If 224 kb/s is what the documentation says, then that must be correct.

[carrascal]

It seems my recollection was at fault there. If 224 kb/s is what the documentation says, then that must be correct.

You got me wrong. The stereo track was in fact encoded at 192 kb/s and that was the reason for my question. You seemed to know that this is the way it has to be (in spite of what is written in the version history).

[fritzi93]

Eh, ya got me. [shrugs] I was going from past experience, and would never assume my memory cannot be at fault. I've been caught out before.

I edited a post above. I meant to say deselect all *AUDIO* options in settings.

But I suppose you completed your project successfully then?

[carrascal]

Eh, ya got me. [shrugs] I was going from past experience, and would never assume my memory cannot be at fault. I've been caught out before.

I edited a post above. I meant to say deselect all *AUDIO* options in settings.

But I suppose you completed your project successfully then?

I haven't played the movie yet, but at least BD-RD was able to create a new movie reporting no errors.

Well, I didn' really deselect all AUDIO settings, just leave the default settings that are ok to me (do not reencode AC3 or DTS tracks).

I still don't know wether the stereo track encoded at 192 kb/s es simply a program feature, a bug or my mistake.

Best Regards

[jman98]

I still don't know wether the stereo track encoded at 192 kb/s es simply a program feature, a bug or my mistake.

Best Regards

You'd have to want to know bad enough to go over to the Doom9 official forums for BDRB and ask there. And there's a rather large chance that you won't get a sane answer about why what you got seems to be at odds with the docs and get instead a bunch of sycophantic followers of the author who will immediately step in and accuse you of being an idiot and causing this through some misunderstanding on your part as the author himself is absolutely perfect and simply cannot make a mistake. Not really joking or exaggerating about that. The author himself seems to be a decent and sane enough guy, but his followers on Doom9 are not. My quite serious advice is to just drop it and get on with your life.