Remux vs Encodes?

[Zach_N85]

Hi guys,

Few quick questions about this:

1. Remuxes are 1920x1080p and 1080p encodes are actually 1920x800p, though they both have the black bars. Is there a loss in pixel density in encodes compared to remux? Both look the same.
2. If I download a DTS-HD encode, is the audio quality still compressed (My understanding is that it's not)
3. Is the difference in quality really worth it?

Thanks

[LigH.de]

1. Remultiplexing means: Don't change the content, only put it in a new container. I did not understand what you mean exactly, regarding 800 or 1080 lines height, but remultiplexing won't change that; letterboxes can be either encoded in the video, or added by a player to fill the screen when playing in fullscreen mode, you will spot the difference in windowed mode.

2. You do not download movies. You may buy a copy of them if they are commercially distributed.

[Zach_N85]

Thanks for the reply.

I mean that if I play a Remux, PotPlayer indicates the resolution as 1920x1080p and if I play an encode, the resolution is 1920x800p though they both have the black bars at the top. I'm just wondering why encodes are labeled 1080p but they are actually 800p.

Based on your answer I understand that in Remux the letterboxes are native and in encodes, they are added by the player, hence 800p, but the main image is the same?

BTW, I buy movies copies regularly, but this was just to test the original BluRay quality vs Remux/Encodes.

[LigH.de]

How do you define "a remux"? How did you create that?

Technical details of your material are best collected using MediaInfo (optimally in extended mode, which creates a lot of text).

[Zach_N85]

I didn't create the remux myself. I downloaded a Remux and an encoded movie to test the quality of the file vs an original copy on my BR player...

[sneaker]

1. In one case the encoded resolution is 1920x1080 and in the other case it is 1920x800 (without black bars at top and bottom for a 2.4:1 movie). But when you play 1920x800 on a 1920x1080 display the player (here: PotPlayer) will add black bars on-the-fly. I mean, what else should it do? It has to fill your complete display somehow...
2. DTS-HD Ma is compressed but it is a lossless compression. Like if you zip a Word document and later un-zip it, it will be 100% like the original one without any loss. It is a way to save disc space without losing quality. It may also have additional channels compared to the smaller DTS core.
3. That's your decision. If you have max <=5.1 speakers or don't hear a difference then it is not worth it. (Most people won't hear a difference.)

[Zach_N85]

Thanka sneaker.

How would you rate the quality of Remux/Encodes vs original BR in %?

From my testings there's no noticeable difference between the BR disc, the Remux and the Encode.

[Zach_N85]

1. In one case the encoded resolution is 1920x1080 and in the other case it is 1920x800 (without black bars at top and bottom for a 2.4:1 movie). But when you play 1920x800 on a 1920x1080 display the player (here: PotPlayer) will add black bars on-the-fly. I mean, what else should it do? It has to fill your complete display somehow...

So it's basically the same quality, just that the encoded file doesn't include the native black bars, and lets the player fill them in? In other words, the encoder only encodes the main image, without the black bars.

2. DTS-HD Ma is compressed but it is a lossless compression. Like if you zip a Word document and later un-zip it, it will be 100% like the original one without any loss. It is a way to save disc space without losing quality. It may also have additional channels compared to the smaller DTS core.
3. That's your decision. If you have max <=5.1 speakers or don't hear a difference then it is not worth it. (Most people won't hear a difference.)

Cool, thanks.

Last Q: If you'd have to compare the quality of a good encode vs the original BR/Remux in %, what would it be? From my tests, there's almost no difference at all. I'd say the encode reaches 90-95% quality of the original.

[teodz1984]

It all depends on the quality of the encode...
Blueray is a lossless source, Encodes are usually is a lossless format.. They will never be equal to to the original by a factor near 100%..
You always lose data when you compress something... Note when you get to action scenes or dark scenes, you see a lot of lost details or blocky pixels.
Also details on lossy encodes can be seen on large screen monitors/tvs..

[forsure]

I am noticing that the difference between the two is so marginal, that wasting time and bandwidth is not worth it. Especially since the 4k tv does a lot of the work.