How common is dts ma 2.0 and 1080i on blurays?

[yoda313]

I've been picking up more anime blurays and I noticed two interesting features:

1080i video

and

dts ma 2.0 audio

Of course these are store bought blurays but I'm wondering why any studio would produce a 1080i disc. It must obviously be part of the spec for it to be a pressed factory bluray but I guess I wonder why. If they are already at 1080i why not just do the 1080p transfer?

Also regarding dts ma 2.0 - isn't it overkill to do stereo in dts-ma? I guess technically to me dolby truehd in 2.0 would be overkill since both are lossless.

Maybe I just expect stereo only sources to be lossless pcm. So I guess technically its no different if its in a dtsma or truehd form then is that correct? I mean given the same bitrate and source are all three lossless codecs virtually identical? I mean in the bluray world?

Would a soundtrack - 5.1 or 2.0 - in lossless pcm, dtsma or truehd be truly identical in the real lossless world?

Is there any filesize gains to be had at the lossless level? Or is lossless identical across the formats?

Is it a licensing arrangement that determines the codec used? Is lossless pcm a truly "free" codec for a studio to use? Is dtsma the most expensive?

If so why wouldn't a studio pick lossless pcm 9 times out of 10?

Or is it more a marketing gimmick to have the dts name on it for the audio snobs who think dts is the end all and be all of digital audio?

Thanks.

[El Heggunte]

Is there any filesize gains to be had at the lossless level?

There exists a *filesize difference* between a 2.0 DTS-MA stream and a 2.0 PCM stream,
guess which one is less huge

Also, there exists a filesize difference between a DTS-MA encode and a TrueHD encode from the same source.
DTS-MA compresses worse than TrueHD, because the lossy core uses CBR, which is less efficient than VBR (whereas TrueHD has no lossy core to depend upon, even though an "interleaved" AC3 substream is mandatory for Blu-Ray audio). Technically the DCA compression supports VBR, but no encoders available thus far have implemented it, plus, the DVD-Video specs and the Blu-Ray specs do not support it either. Besides, there exists *pure* DTS-MA (i.e., without a DCA core), but again, this is not defined in the Blu-Ray specs.

Or is lossless identical across the formats?

Depends of course on what you mean by "identical"

Maybe I just expect stereo only sources to be lossless pcm.

That's it, you're expecting too much

Is dtsma the most expensive?

No, it's less expensive (and less of a P.I.T.A as well) than TrueHD:

https://forum.videohelp.com/threads/342599-What-happended-to-Dolby-TrueHD?p=2250448&vie...=1#post2250448

>> 1080i vs 1080p <--- I leave this to someone else like poisondeathray or jagabo

[_Al_]

You cannot have 30fps progressive in 1080 resolution on Blu-Ray,
test if it is fake interlace, load it into MPC-HC for example with no interlace filter and manually step frame by frame

it is quite weird now, you cannot author BD with 30p but there are exceptions now for 60p, well players might play those 30p or 60p anyway but no BD authoring , https://en.wikipedia.org/wiki/Blu-ray_Disc#Video

[turk690]

You cannot have 30fps progressive in 1080 resolution on Blu-Ray...

So true. Only 60i; 30p1080 can be tagged as "fake interlaced" though. But there is 24p1080. If you must have 50/60p, then it has to be 720 only.

[yoda313]

@ el heggunte - thanks for the info. I would not have expected dtsma to be cheaper or easier to work with.

@ _al_ and turk690 - I don't have the bluray on me at the moment to do media info on the m2ts files. That should give me everything I need to know.

So true. Only 60i; 30p1080 can be tagged as "fake interlaced" though. But there is 24p1080. If you must have 50/60p, then it has to be 720 only.

Actually this is nothing I"m doing - I don't even have a bluray burner, rom only. It's a pressed factory disc I"m referring to that says its 1080i video.

[dannyboy48888]

Seen alot of documentaries ie wonders of the universe with two ch lossless