Sony Vegas Eating Up To 100% CPU

[John Rofrano]

[Travis Rhoda] ” So, lets say I set it to 30.”

You really want to set it to 29.976 which is the NTSC frame rate for video.

[Travis Rhoda] “However, the Bit Rate is variable up to say 1000kb/s. Is that effectively saying that the Frame Rate is also variable? Would increasing/decreasing the Bit Rate make my rendering slower/faster?”

No. The frame rate controls how many frames per second. The bit rate controls how many bits will be used for each frame. If you want to maintain quality, you need to keep the relationship between these the same. For example 50Mbps at 30fps is the same quality as 100Mbps at 60fps. i.e., if you double the frame rate, you should double the bit rate to maintain the same quality.

[Travis Rhoda] “The other side of the coin is that MANY YouTube people use OBS. They swear by it and the bulk of them use some version of Sony Vegas. I, being new, obviously used their suggestions and settings and have the results I do now.”

Well… unless they are keeping some secrets from you, you are not using the same settings because it works for them and doesn’t work for you. I would go back and ask them exactly what their workflow is. Maybe they are transcoding to a different format before editing and not telling you?

[Travis Rhoda] “So, as per the suggestion, re-rendering my MP4 into what format? MP4 again or MPEG2 or AVI?”

You can try MP4 again and see if it works but it’s harder for Vegas Pro to edit MP4 than MPEG2 or M-JPEG AVI.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[John Rofrano]

I can’t speak for Wayne, but I’m guessing that recording a new 1 minute clip and uploading it would be the most useful. This way we can see what’s coming out of OBS.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Wayne Waag]

Agreed.

wwaag

[Rob Clapham]

Hi, I use OBS and looking at some of the posts.

I haven’t imported massive files into Sony Vegas yet, but I haven’t had any playback issues using Vegas for camera video, or the OBS files I have tested on. I typically convert the .flv files to .mp4 as it is recommended to record .flv by OBS – it’s more stable. As a side note, I livestream and you can also save the file locally (instead of downloading from Twitch for example, in this case the file is .mp4.) I livestream at 720p 60 @ 3000kpbs, and sadly OBS doesn’t let you drop the framerate down to 59.940, same for 30 down to 29.976. I’d have to check the properties of the file to see the actual framerate. I have also not noticed that the framerate was varied in my videos?

Have you enabled the GPU in vegas?

When I convert the .flv with Handbrake I basically use the VBR with 2 pass at 60fps I set the bitrate to 3500kbps, slightly higher than the original file – not sure if that is recommended, but I figured it would keep the original bitrate more intact as it is already very low. If you’re using a higher bitrate because you are recording locally just match that in handbrake or lower it if you think that will work.

I hope some of what I’ve said helps/makes sense.

[John Rofrano]

That’s good information Rob. If OBS is recording at a variable frame rate at times, it’s best to always transcode to a constant rate rate before editing in Vegas Pro.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Rob Clapham]

I just did a little more digging. I looked at my .flv files’ properties none contain a framerate this doesn’t mean that it isn’t constant though!

Basically in OBS you have to go to the advanced settings tab and check ‘use CFR’ (constant framerate) https://obsproject.com/forum/threads/cfr-option.1741/ Then choose the framerate under the video settings tab.

The only reason to transcode it then, is to get a format sony vegas can use.

Also i just put in a 2 hour video from obs, no real issues… I’ve got a 4690k and gtx 960. So this variable bitrate thing must be the culprit.

Hope that helps!

[Aaron Star]

You can record to .mp4 in OBS by changing the .FLV under broadcast settings to .mp4. This will keep you from having to convert the .FLV, and allow you to drag and drop to the Vegas timeline.

You also could change to .MP4 without handbrake with an FFMPEG command:

D:\Videos>ffmpeg -i Filename.flv -vcodec copy -acodec copy OutputFilename.mp4

This way there is no re-encode with handbrake, and you save a visual generation.

In my testing with OBS and Vegas on my i7-870/HD5770, I was able to record 1080-60p by unchecking the CBR and upping the bitrate to 16000-22000.

Disabling resample in the timeline clips helped speed up encoding to SonyAVC-60p-16Mbs, and rendering to XDCAM-ex both 720-60p and 1080-30p were the fastest renders. YouTube supports converting XDCAM.mxf files.

OBS has Quicksync and NVENC support, have you tried these settings with your NV card and Gen4 i7? If these work, it would save a lot of system overhead on the screen capture.

FFSPLIT is another version of this application that seems to work better with lower overhead, but no Quicksync or NVENC support.

[Rob Clapham]

Hi Aaron, just mentioned about OBS in my other post.

I think one has consider what OBS is predominantly aimed for, which is live streaming. That is not to say you can’t use it for local recording, but rather just some pointers from my experience with the program.

If the op only wants to record locally, then I’m sure you’re suggest is very valid – I personally haven’t tried it, but I will have a look when I do need to record some in game footage for a specific video.

The only reason, I have recorded files with OBS locally was to test out my live streaming settings which are outlined over on twitch.tv. You need very low bitrates anything from 2000kbps to 3500kbps – I hear that twitch get a little sensitive if you go over their limits, especially if you’re new to the game. But, maybe that’s just an urban legend.

In my case, I guess checking the CFR box is a must, as Aaron points out to achieve a constant frame rate you need to use a bitrate of 12000-22000kbps. Also, you are able to record directly in .mp4 with OBS, I’m not sure if this is the case so much now, but the guys over on OBS do/did state that recording in .flv is much more stable. Maybe I’m wrong, because when I livestream I also record the file locally – the default is that the recorded file is in fact saved as .mp4 so, I guess it can’t be ‘that’ unstable.

As for using intel quick sync or nvenc – in my experience, testing these at very low bitrates, they look hideous compared to h264. But intel quick sync does look better than nvenc at lower bitrates – https://www.youtube.com/watch?v=Z6uaPD_5r4w . If you are interested in using quick sync here is a tutorial to set it up with one monitor https://www.youtube.com/watch?v=idhkZy-tMTU . My tip is to ‘move’ the extended monitor, so that the mouse doesn’t move over to the virtual monitor.

I’m sure using intel quicksync or nvenc with higher bitrates or as suggested by Aaron would produce more than acceptable videos. But I would say, record a few test files find a bitrate you’re happy with, see if the framerate is variable and then decide whether or not you want to use the CBR box under advanced settings.

An alternative would be to record with Nvidia’s Shadow Play, I haven’t used this yet, but I have read that the files aren’t supported in Sony Vegas, so you may need to transcode them in handbrake – which I guess you don’t want to do. I guess the advantage of recording in OBS with Nvenc is that you have a choice to use .flv or .mp4.

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[Aaron Star]

The FFMPEG command I gave:

ffmpeg -i Filename.flv -vcodec copy -acodec copy OutputFilename.mp4

will not recompress the media like handbrake will, it just changes the container from .FLV to .MP4(vegas compatible) The audio and video are untouched and remain in the same form.

I recommend you check out https://www.ffsplit.com/download/ / XSplit (commercial version), it has the almost the same interface and it writes constant frame rate files. OBS’s lack of writing a video standard file is really odd. This is what happens when a computer guy builds a video application, instead of a video person. There are video standards for a reason.

You may want to think about running another instance of the encoder. One for local recording, and the other for the stream/feed. This would allow you to edit the recordings at a higher bitrate. YouTube for example encodes at 7.5Mbs for 720-60p, 12Mbs for 1080-60p. That means you should be editing and uploading 15-20Mbs+ files for good results.

https://support.google.com/youtube/answer/1722171?hl=en

https://help.twitch.tv/customer/portal/articles/1253460-broadcast-requirements

I don’t know just some thoughts.