Grencola wrote: Tue Feb 12, 2019 8:47 pm
Shasarak wrote: Tue Feb 12, 2019 3:40 pm
People recommending the Sony X700 as a Dolby Vision media player should be a little careful.
It
does correctly play back dual-layer DV if it is muxed into MP4 format, as described in this thread (meaning no HD audio). However, it
doesn't play back dual-layer DV in M2TS format.
If you try and play a file like that via DLNA, it plays as HDR10. If you copy the file onto an external drive and connect directly via USB, then you'll get Dolby Vision output, but it still isn't actually reading the DV metadata from the file - instead it is simply reading the HDR10 stream and then converting that to DV on the fly.
The results still look quite good doing that (and if the M2TS file is only HDR10 in the first place then it will convert it to DV, and that can look very good); but it's not the same as actually using the dual-layer DV information in the file.
so forget mp4 for a second and just talk m2ts.
Even when both the player
and the tv are showing dolby vision, it's still faking it? because that's what happens I play both a uhd disc and an m2ts from usb hdd. there's no difference I can find in any setting or menu or info display that is different between disc and m2ts usb. how is one to tell? I can see it being fake over dlna though, where only one of the two devices is showing dolby vision - as I said it seemed iffy, but I honestly can't see the dif with disc vs usb...
"Fake" is rather a strong word, and somewhat misleading. The signal that it outputs
is in Dolby Vision format, and will be correctly interpreted and displayed as DV by the television; it's a question of where it gets the DV metadata from. If you play a DV disc then it reads the second video layer and gets the DV metadata from there; if you're playing an M2TS file then it takes the static HDR10-layer metadata and repackages that as DV. What you end up with on the TV screen will often be exactly the same - the only difference is when the DV stream is varying the metadata from scene to scene.
Because the television is receiving a genuine Dolby Vision signal in both cases, you can't rely on the TV to tell you what the player is doing. If you want to see, press the Options button on the X700 remote while it's playing, and see what it says at the top left of the screen. If it's actually accessing the second video layer for metadata then it should say something like "Vision"; if it's only reading the HDR10 layer and converting it'll say "HDR".
(The ability of the X700 to convert HDR10 to DV on the fly is extremely useful, incidentally, especially if you own a 2016-issue LG OLED TV - the Dolby Vision processing is much better than the HDR10 processing, particularly for material with a peak brightness of above 1000 nits).