Extremely Long Render Time & Low CPU Usage

MysticalFists wrote on 6/28/2019, 8:17 PM

Hello,

I've seen this question asked before, but my issue is a bit unique. I record all of my videos locally in a high quality and use Vegas Pro 14 to edit and render them in lower quality before uploading them to Youtube. I built this computer specifically for the dual task of recording my gameplay and rendering those videos:

CPU: Intel Core i7-6850K $609.99
RAM: Corsair Vengeance LPX 64GB DDR4 3200MHz
GPU: ASUS GeForce GTX 1080 8GB ROG STRIX
SSD: Samsung 960 PRO NVMe M.2

None of my videos have ever taken much more then 1:1 to render (5mins renders in about 5mins and so forth); however, I recently had a 3 hour session (not uncommon) and was making 3 separate videos from it. The first video was a 5min clip at the beginning and renders in 5-6mins. The second two were 5-15min clips from portions at the end, and they both needed over 40mins to render. I've edited clips from long videos like this in the past and never had this issue. I also noticed that Vegas Pro normally uses 60-80% of my CPU (and it did for the first clip), but it's only using 25% or less for the second two clips. All of this can be recreated, as I've done it more than one now. Am I just lucky to have never experienced this before when using longer source videos??

Recording: 1080p @ 100fps
Rendering: 720p @ 30fps
3 videos from the same source. One is fast, 2 are super slow.

Lucas

Comments

Musicvid wrote on 6/28/2019, 9:18 PM

If you are resampling your frame rate change, that takes a lot of time.

If you are asking for peer support, please post these properties, and tell us what's on your timeline, including effects and generated media.

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

MysticalFists wrote on 6/28/2019, 10:12 PM

General
Complete name                            : C:\Users\Tw33k\Videos\ArmA 3\ArmA 3 2019.06.27 - 19.45.19.05.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42)
File size                                : 28.2 GiB
Duration                                 : 3 h 5 min
Overall bit rate                         : 21.7 Mb/s
Recorded date                            : 2019
Encoded date                             : UTC 2019-06-28 03:51:01
Tagged date                              : UTC 2019-06-28 03:51:01

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.2
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Format settings, GOP                     : M=1, N=30
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 3 h 5 min
Source duration                          : 3 h 5 min
Bit rate                                 : 21.5 Mb/s
Width                                    : 1 600 pixels
Height                                   : 900 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Variable
Frame rate                               : 59.940 (59940/1000) FPS
Minimum frame rate                       : 51.311 FPS
Maximum frame rate                       : 63.785 FPS
Original frame rate                      : 60.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.249
Stream size                              : 27.9 GiB (99%)
Source stream size                       : 27.9 GiB (99%)
Title                                    : VideoHandle
Encoded date                             : UTC 2019-06-28 03:51:01
Tagged date                              : UTC 2019-06-28 03:51:01
Color range                              : Limited
Color primaries                          : BT.601 NTSC
Transfer characteristics                 : BT.470 System M
Matrix coefficients                      : BT.601
mdhd_Duration                            : 11139629
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 3 h 5 min
Source duration                          : 3 h 5 min
Bit rate mode                            : Constant
Bit rate                                 : 192 kb/s
Nominal bit rate                         : 96.0 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 260 MiB (1%)
Source stream size                       : 260 MiB (1%)
Title                                    : SoundHandle / System sounds
Encoded date                             : UTC 2019-06-28 03:51:01
Tagged date                              : UTC 2019-06-28 03:51:01
mdhd_Duration                            : 11139563

Absolutely no processing effects or media. This is simply a 5min cut of the video taken at the beginning, middle, and end. Any segment from around 2/3rds to 3/4th's of the way through or earlier renders to the "MainConcept AVCAAC MP4 Internet HD 720p" at a rate of nearly 1min/1min with high CPU usage. Any segment taken after that takes nearly 8 times that to render.

Musicvid wrote on 6/28/2019, 10:53 PM

Your video is variable frame rate, not 100fps.

First convert to constant frame rate, same as source, in Handbrake.

EricLNZ wrote on 6/28/2019, 11:50 PM

It may not be relevant but your source appears to be 1600x900, not 1920x1080?

MysticalFists wrote on 6/29/2019, 12:08 AM

Yeah,
Please disregard my inconsistencies there, lol. I forgot I was playing on my monitor. I moved two months ago and don't have my flat screen TV with me. Realized I also switched to recording with Geforce Experience (or Shadowplay) when I got the newer graphics card. Shadowplay apparently records at a variable FPS rate, while OBS is constant and that is what I had been using.

I'm running the source through Handbrake right now so I can test a few renders, but that'll take 2 hours. Guessing that'll be the culprit as it's already showing the FPS is 60 (what I'm playing the game at), but average of 90. I also saw some people suggest striping the audio with VLC and rendering the Shadowplay Video with VLC audio in Vegas Pro as a workaround so I'll test that as well.

Assuming the variable recording rate in Shadowplay is the cause, I'm quite likely to switch back to OBS. Shadowplay was just there, available, and ready to use, lol.

Musicvid wrote on 6/29/2019, 1:04 AM

Shadowplay doesn't work directly in Vegas. Recommended OBS settings are here:

'https://www.vegascreativesoftware.info/us/forum/faq-what-obs-studio-settings-work-well-with-vegas-pro--109925/

MysticalFists wrote on 6/29/2019, 6:32 AM

Thank You!!

I've been using Shadowplay for about a year now; however, I've never run into this issue yet. Realized this was the first time in about that time that my source content has been anywhere near over an hour. This also solved another issue I had outside of Vegas Pro, which is the fact that my source content has been taking up nearly 3 times as much space even after drastically reducing the quality level recorded by Shadowplay.

Mucho Gracias!
- Lucas