file size and tags

[johnrobsonuk 1]

Little confused what is better quality

 

So heres a example 

i haev a dolby atmos system as well as a HDR10+ tv Samsung so no dolby vision

 

I use both 4k nvidia sheild and a Apple tv 4k 

 

Both have emby on them,

 

Which file is best?

 

Also odd issue some Dolby 7.1TruHD tracks don't display dolby atmos  on my apple tv but say if its a 5.1 file it will display dolby atmos.

Nvidia shield shows it as dolby atmos on all

 

so 3  issue not sure what file i should be getting for best results 

 

 

 

Also last issue can a nvida sheild or apple tv  play rips like this  or do they have to be MKV

 

 

 

[Luke 42083]

Hi ,they need to be mkv. It's hard to predict which one is best but let us know if you find out.

[johnrobsonuk 1]

no one give any advice on this 

[visproduction 316]

All audio / video compression codecs alter the original master so that the content plays back with the best quality possible.  The video and audio compression choices made by Dolby or DTS, in HEVC encoding, HDR, HDR10 are all methods, made to appeal to the consumer, to show better video and more pleasing audio. Every codec compression loses something from the master media.

I prefer DTS but have not tested DTS HD, since I don't have that hardware.  I find HEVC edges of colors are not entirely realistic and seem falsely accentuated, where as the older h264 appears smoother and more realistic to me.  Since h.264 plays on all hardware without extra plugins, I just choose to convert, ahead of time, to h.264 (.mp4) for media server playback.

HDR and HDR10 converts colors for transmission and then reconverts back with hardware processing.  This helps resolve issues with 4:2:2 color space limitations.  It is used to help get more vibrant colors.  It works, but I don't like this whole color conversion idea.  In my opinion, it emphasizes color just to boost the color space for playback, so the user can notice a difference. "Wow, look at those colors!".  This is the same as emphasizing the bass and treble in audio so the user notices the effect and the manufacturer sells more product.  No audiophile will listen to emphasized bass and treble for realistic recordings of an orchestra or jazz club, so audiophiles never buy this type of oversized bass and treble, tweaked speaker setup.  To me, HDR is doing a similar thing and I don't care for it.  If you look closely on a cloudy day, colors are not intense.  In a darkened room, yellows and reds disappear.  I prefer DTS audio with no HDR and am happy to watch the old h264 (mp4) media.

Full disclosure, I never listen to MP3's anywhere and only playback with tube amps for any digital source in the best master quality for audio and I turn off any TV audio or video enhancements to get as close to the original, as possible.  Also, I've color corrected films in post production and have worked with different compression options from media master uncompressed 4:4:4 space and have designed speakers.  I have not tested all the new formats, nor closely looked at HDR playback.  The above comments are just my current preferences.

 

Edited May 4, 2023 by visproduction

[johnrobsonuk 1]

Wow thanks for this detailed response  

[rbjtech 5284]

23 hours ago, johnrobsonuk said:

i haev a dolby atmos system as well as a HDR10+ tv Samsung so no dolby vision

Dolby Atmos comes in two flavours - Compressed Dolby Digital Plus (it's actually usually 'fake/matrixed' Atmos from a 5.1 source) or the 'real'  7.1+ Atmos in uncompressed Dolby True-HD.

If you have the hardware to decode it (ie an AVR or Soundbar that can decode True-HD) - then Dolby True-HD is obviously better - but at the expense of much more storage and much less compatibility with 'other' devices the file may be played on.  This is why the files sometimes come with multiple tracks - so you simply select the one for your system.    But the complications arise when the 'Default' is lets say a THD track and the device cannot play that - emby then needs to convert it - potentially losing quality when there may be a perfectly good alternative (Atmos if DD+) track available.

As you have a Samsung TV - then yes, stay away from Dolby Vision - especially Profile 5 and Profile 7 (but unless described, there is no way of knowing without using mediaInfo etc to check).  Profile 8 'should' be ok as it will fallback to HDR10 or HDR10+ which your Samsung will understand.   But if there is a choice - then use HDR10 or HDR10+ only.

23 hours ago, johnrobsonuk said:

Also odd issue some Dolby 7.1TruHD tracks don't display dolby atmos  on my apple tv but say if its a 5.1 file it will display dolby atmos.

Nvidia shield shows it as dolby atmos on all

This is simply because the AppleTV cannot decode any HD Audio, the Shield can.

You haven't mentioned DTS - but DTS-HD is the uncompressed version of DTS, but it too has a object based system called DTS-X.   The Shield can play all of these.

Edited May 4, 2023 by rbjtech