Gigabit 5g wifi Vs. Ethernet

[davexnet]

Downloaded some sample HDR video's from the net and have been attempting to
stream them from my PC to the TV. Both devices are hooked up to the router via ethernet.
I was surprised to see the TV would not play the video without buffering a number of times
during the 2 minute 30 seconds file.
For something to try I disconnected the TV from the ethernet and setup 5g wifi to the same router.
Now the video plays all the way through without a hiccup. The specs of the video are quite high,
and it's a little too much to play on my PC with it's motherboard video - but seems to be well within
network speed specs.
The only thing I can think of is the ethernet cable is no good, even though it says certified for cat 5e
on the side of it. Here's the video spec:

General
ID                                       : 0 (0x0)
Complete name                            : s:\Video\4k UHD\Samsung Travel With My Pet HDR UHD 4K Demo_60fps.ts
Format                                   : MPEG-TS
File size                                : 957 MiB
Duration                                 : 2 min 35 s
Overall bit rate mode                    : Constant
Overall bit rate                         : 51.6 Mb/s

Video
ID                                       : 257 (0x101)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
Codec ID                                 : 36
Duration                                 : 2 min 34 s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 59.940 (60000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
Writing library                          : ATEME Titan File 3.7.9 (4.7.9.0)
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0500 cd/m2, max: 1000 cd/m2

Audio
ID                                       : 258 (0x102)
Menu ID                                  : 1 (0x1)
Format                                   : AAC
Format/Info                              : Advanced Audio Codec
Format version                           : Version 4
Format profile                           : LC
Muxing mode                              : ADTS
Codec ID                                 : 15
Duration                                 : 2 min 34 s
Bit rate mode                            : Variable
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy

[aedipuss]

depends on the rest of your network. these days cat 7 cable is all i use. and make sure you don't have a switch/router that defaults to the lowest speed of the connected devices or it might be limiting everything at 100mbs. or it could be the switch itself.

[Cornucopia]

That file's overall bitrate is 51Mbps! That's nothing to ethernet. Test your subsystem and check for caps & bottlenecks, because you shouldn't be having that kind of issue.

Scott

[davexnet]

Thanks for the responses. It's supposed to be a Gb system, Windows 10 says the speed is 1 Gbps.
I assume the TV is capable of the same, it's a recent LG smart TV. I am using the Cable TV's supplied
cable modem/gateway router; I don't know, you hear different things about sticking with that, but it's mostly
criticized for lack of features rather than performance.

When I put the TV on Wifi the troubles with that particular video cleared up.
I have a another demo on my system, it's 71mbps HEVC @ 4K. This one absolutely does not play, but it doesn't play on my
PC either (it's a modest AMD FX / 4GB RAM system)

I'm going to look for another ethernet cable, one made to a more recent spec as aedipuss suggested and retry

[october262]

also check your tv & cable modem/gateway router for software & firmware updates.

[pandy]

As a general rule cable connectivity will be always superior to wireless but your case as mentioned by many above can be sign of something wrong or with SW or with HW or both on your router - it can be that GbE interface is connected to main SoC trough some limited internal bus should be not the case but who knows how router manufacturer resolved this internally - usually wireless interface is integrated in separate IC nad connected trough some normal bus - it can be USB it can be PCI'e - if router main SoC has some limited connectivity it may be case where router manufacturer decided to connect GbE over USB 2 and WLAN trough PCIe - usually should be opposite way but... classical example is Raspberry Pi 3B+ model - GbE and WLAN share same limited USB 2 bus which theoretical maximum 480Mbps will always limit GbE and WLAN providing at best (bridge from/to WLAN/GbE 240Mbps) add to this software limitation and at some point delivered performance may look really poor when compared to theoretical capabilities of silicone installed within enclosure.
Limitation may also exist on receiver side (poorly implemented wired interface or some software hiccups).

I'm going to look for another ethernet cable, one made to a more recent spec as aedipuss suggested and retry

Check if all 4 pairs are connected on both sides - i saw few times ready to use patchcord with only 2 pairs wired (green and orange) - both marked as cat 5e but they will not work correctly with GbE (they offer only FE 100Mbps) - GbE require presence of All 4 pairs.

***
by GbE i mean 1000BASE-T not 1000BASE-TX