My PotPlayer would play it smoothly. It would be nice if Vegas could decode it by calling FFmpeg / LaV Filters like PotPlayer.

@RogerS

"an Intel decoder (is that what John Dennis has?)" 

My i7-6850K doesn't have an on-die video adapter. Decode is done by an AMD RX480-8GB per my signature.

My playback starts at ~13 to 15 fps on the first pass, then it appears the whole video gets cached and I get full preview at Best/Full.

Just a different slant on hardware (specs in sig below), the clip played back fine on my computer in Good>Full. Also I tried Best>Full. GPU was running at 72% GPU Decode, CPU 25% all cores/threads.

@john_dennis how can you tell your fps playback speed?

@Reyfox

"...how can you tell your fps playback speed?"

@john_dennis hahahaha... right in front of my 4 eyes! I get that playback speed on my computer with Best>Full.

I just wanted to be sure before I said something I will have to retract later.

@RogerS

"an Intel decoder (is that what John Dennis has?)" 

My i7-6850K doesn't have an on-die video adapter. Decode is done by an AMD RX480-8GB per my signature.

My playback starts at ~13 to 15 fps on the first pass, then it appears the whole video gets cached and I get full preview at Best/Full.

@john_dennis If Vegas was a video player that would be fine, but with an editor it will lose it's cache each time it gets to an edit point, go back to 13-15fps. Cuts alone don't affect the cached timeline, need to either remove a slice or add a simple fade transition. I suspect it's the decoder overload problem, because you have an abundance of CPU. Incidentally your very high GPU decode corresponds to what I see with Premiere2022 playing this file. High due to high bandwidth I guess, 4K30 AVC GPU decode of non ALL-I is normally much lower

On my computer this file doesn't use hardware decoding (Intel) and maxes out my CPU at 100%.

 

Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : High@L6.1
Format settings                : 1 Ref Frames
Format settings, CABAC         : No
Format settings, Reference fra : 1 frame
Format settings, GOP           : N=1
Codec ID                       : avc1
Codec ID/Info                  : Advanced Video Coding
Duration                       : 35 s 969 ms
Bit rate mode                  : Variable
Bit rate                       : 466 Mb/s
Width                          : 3 840 pixels
Height                         : 2 160 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 29.970 (30000/1001) FPS
Color space                    : YUV
<snip>

 

466Mbps... that seems seriously pretty high for 30p 4K footage... or am I mistaken?

Interesting, so the AMD decoders are doing a better job with it, it seems.

What's interesting is that decoding and powering on the graphics card both work seamlessly in Vegas Pro 18. Only Vegas Pro 19 is insecure. It is also smooth in Vegas Effect. Only Vegas 19 is the problem. And to be honest, isn't it good to use graphics as well? It's a feature I made to use, but I'm tired of not being able to use it because of an error. Is it normal to get anxious when I turn on the Vegas Pro 19 graphics? If it doesn't work, it shouldn't work, but on the contrary, it works fine in Vegas Pro 18.

I want to solve an essential problem, not a temporary solution.
I couldn't find the reason why the play was different, only different versions of the same Vegas Pro.
Still, I am grateful to my forum friends for being with me passionately.

Based on my 12core CPU using 20 - 25% CPU to playback your file with GPU DECODER OFF, I think your 8 core should also be playing it smoothly.

We don't know why it isn't using the software CPU decoder for you in Vegas 19.

Your VP 18 settings are different- you have legacy AVC enabled on file i/o. This also disables GPU decoding so you aren't using the GPU here.

You can file a support request by going back up to the top and clicking support and then ask support. Include a link to this thread and to the footage and let them know there is a problem with NVIDIA decoding for this type of file. On your system you are unable to play it back even with hardware decoding set to off in file i/o.

Vegas 19에서 CPU를 더 이상 사용하지 마세요.

VP 18 설정 이 . 파일 i/o에서 레거시 AVC를 활성화했습니다. 이 제품 전체를 아우르는 GPU를 사용하십시오.

위로 올라와서 지원을 클릭한 후 지원을 요청하면 지원을 요청할 수 있습니다. 여기에 대한 정보 및 정보에 대한 정보는 NVIDIA에 대한 다양한 정보를 제공하고 있습니다. 시스템 시스템에서 시스템이 고장으로 인해 시스템이 고장난 것입니다.

The strange thing is that Vegas Pro 18 is a computer that plays everything no matter what settings you set... It's the same program with a different version, but I requested support from Magix... Thank you, friend

In that case maybe 18 isn't able to use NVIDIA decoding for this file so it's always using the CPU.

I hope this problem gets fixed soon

 

The strange thing is that Vegas Pro 18 is a computer that plays everything no matter what settings you set... It's the same program with a different version, but I requested support from Magix... Thank you, friend

I showed you how VP18 plays with GPU DECODER on and GPU DECODER OFF, GPU ON = black screen and flashing, GPU OFF = plays back smoothly. You do not follow directions correctly. You are using the following settings in FILE IO:

but you were told to use these settings

You are using the incorrect decoder.

 

프로페셔널한 프로페서만 데 마술에 대한 지원 요청이... 감사합니다.

VP18이 GPU를 플레이할 수 있는 기회, GPU ON = 검은 화면 및 임, GPU OFF = 플레이하는 방법을 보여줍니다. 지시를 하는 것입니다. FILE IO에서 다음 설정을 사용하고 있습니다.

이 설정을 사용했습니다.

 

사용할 수 있습니다.

 

 

I know what you mean.
However, in Vegas 18, whatever decoder setting is, it plays on all settings, so I'm surprised.  If you do gpu on, what you blinked in Vegas Pro19, even if you do gpu on in Vegas Pro18, it works very well. I wonder why you get these different results.

@yoo-changyun

I wonder why you get these different results.

A very good question. I don’t have an answer.