Dolby True HD & DTS Master Audio

superleo

New member
I've downloaded the trial version of the new TVSuite V.4.20.6.610, and tried making a test edit with a demo file from demoworld. This file is short 1080p with Dolby True HD audio as a H.264 file.

I've tried different things to the file before opening it with VRD with no avail.

Thus my question, Does VDR support lossless audio, it seems to me that this might be the problem.

Greatly interested on HD support, video and audio. Thanks

Leo
 

Dan203

Senior Developer
Staff member
v4 supports Dolby Digital Plus, aka EAC3, but not True HD. And we don't support DTS at all. We're considering adding DTS support, but probably not MA.

You might be able to use eac3to to convert the audio to AC3 first, then it will open in VRD.

Dan
 

superleo

New member
v4 supports Dolby Digital Plus, aka EAC3, but not True HD. And we don't support DTS at all. We're considering adding DTS support, but probably not MA.

You might be able to use eac3to to convert the audio to AC3 first, then it will open in VRD.

Dan
Thanks Dan, however my intention is to leave the video and audio at its highest bit rate untouched, reencoding will not work for my intended project.

I've been using VRD since the earliest Tivo days(ty > Mpeg), great product, I hope it supports HD all the way around one day.

Leo
 

Dan203

Senior Developer
Staff member
I assume your source is BluRay since that's the only thing I know of that uses TrueHD and DTS-MA, which means there is nothing you really need to edit. (i.e. no commercials) So what are you using VRD for? To convert the files to another format? If so you should know that most other containers don't support those audio formats either. I think TS, and maybe MKV, can do them, but that's it. If your intention is to remux BluRays to DVR-MS or WTV for playback in MCE (common usage) then you're going to have to recode the audio anyway.

Dan
 

superleo

New member
I assume your source is BluRay since that's the only thing I know of that uses TrueHD and DTS-MA, which means there is nothing you really need to edit. (i.e. no commercials)
Source material is mainly Blu-Ray, but HD Demo clips also. The intended project is to produce a High Definition Demo Disc, as mentioned in your main page, take the best parts of the material. There will be no joining or additional editing, other than extract the clips. There is a V.1 of such a disc already, if you are curious enough...

http://www.avsforum.com/avs-vb/showthread.php?t=1243227

Just trying to use better tools (VRD) that would give better results.

So what are you using VRD for? To convert the files to another format? If so you should know that most other containers don't support those audio formats either. I think TS, and maybe MKV, can do them, but that's it.
The intention is/was to use VRD to cut the clips out at a specific frame instead of using time stamp codes as previously done.

Final product would be a Blu-Ray, so there is no problem with whatever the original audio is. No coding/muxing or reencoding/remuxing anything.



If your intention is to remux BluRays to DVR-MS or WTV for playback in MCE (common usage) then you're going to have to recode the audio anyway.

Dan
Some of the guys interested in this project use HTPCs, and had managed to use the disc as produced taking advantage of the full HD audio and video.

I know is sounds easy just to add support for this or support for that, and is not, specially when you have a preview screen that needs to keep everything together, but I hope VRD considers full HD support in a near future.
 

nabsltd

New member
So what are you using VRD for?
I know this is an old thread, but I've got another answer for you: there are a few directors who don't know when to stop tinkering with their movies and refuse to sell high-quality versions of the originals.

Some of these movies can be improved a lot by removal of just a few scenes.

Also, the very few movies that span two Blu-Ray disks often have different lengths for the audio and video streams. This makes no difference until you try to re-join the movie into a single file.
 

Dan203

Senior Developer
Staff member
We actually looked into this a while back. The licensing fees for these two formats, even just for decoding, are prohibitively expensive. These are formats used in professional level software costing hundreds or thousands of dollars, not a $75 consumer product. It's unlikely they'll ever be added to VideoReDo.

Dan
 

impala454

New member
Hello, I'm new to the forum. I found my way here from a suggestion to my question over on AVS. My question is very similar to Leo's, in that I would like to pull some specific scenes from various bluray movies, however I don't require HD audio in my project. In fact I'd rather not have the HD audio. I would also like to sequence the various scenes together and add some text as well. Would VideoReDo work for me?
 

Danr

Administrator
Staff member
You should be able to do that. If you have a problem with the text portion, let me know. We just found and fixed a bug with the titling and H.264.
 

Dan203

Senior Developer
Staff member
Although you would have to rip the BluRay so that it has a standard AC3 track, or recode the HD audio track to standard AC3, MP2 or LPCM first or it wont even open in VideoReDo.

Dan
 

superleo

New member
I'm researching some other subject regarding HD audio and stumbled into this thread (again). As mentioned by Dan ture HD in any flavor DTS or Dolby is used in professional grade programs. It would be awesome if these companies would make it available to the regular user, which in my opinion would be as limited as the pro use. Not many regular users are willing or have any interest on mixing, dubbing, altering or the likes with HD audio anyways.

There are workarounds if one really wants to use digital un-compress /lossless audio but not specific DTS or Dolby lossless.

Regardless or not VideoRedo is compatible with lossless audio or not it is worth every penny if you have the use for it.

Here is the final finished project in case someone is interested. http://www.avsforum.com/t/1391873/reference-blu-ray-demo-disc-bd9-dvd-dl-media-bd50
 
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Dan203

Senior Developer
Staff member
Actually I've done some research on this myself and it "might" be possible for us to support DTS HD in the future. Apparently the way DTS HD works is is uses a standard 5.1ch DTS stream and then has some extra data which fills in the gaps and makes it lossless. Which means we could use a standard DTS decoder to play a lossy version of the audio, which is good enough for our UI, and simply pass through the original HD audio to the output file like we do now for AC3.

If you recoded the audio then it would actually be taken from the lossy 5.1ch portion of the stream, so it might lose a bit there, but for basic editing it should work. This is something that is on my list for future development.

Dolby True HD is a completely separate codec from AC3 and as such requires a special license, so that is something we probably wont be able to support.

Dan
 

superleo

New member
In most bluray authoring programs you have to demux the the audio from the video to their raw streams. Dolby is much more complicated to demux than DTS. You are correct the lossless portion in the audio comes from an "extra" component to call it something. There is always an AC3 core.

In the case of VRD, if it supports HD audio editing in the future are you saying that it will be able to cut the audio and keep it sync by just using the AC3 core audio? Then once this is done the edited clip would keep the HD component to it too?
 

Dan203

Senior Developer
Staff member
That's the plan with DTS. I'm not sure about Dolby HD yet. If we can do something similar to what we do now with standard AC3 (i.e. pass through simple cut only) then it's a possibility.

Although this discussion is in the v3 forum. Keep in mind that these enhancements will likely only apply to TVSuite v4, or maybe even v5.

Dan
 
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