If you're streaming, use CBR as every platform recommends it and it's a reliable form of Rate Control. If you're recording and need to be high quality, use CQP if the file size is no issue, or VBR if you want to keep file size more reasonable.
But there is a slight trade-off in quality, and the reality is that x264 looks better than both NVENC and AMF when given enough power to do its job. When selecting a x264 you can then adjust the CPU Usage Preset from ultrafast all the way down to slow and placebo.
between 4500 and 6000 kbps
CRF
| Acronym | Definition |
|---|
| CRF | Clinical Risk Factor |
| CRF | Controlled Release Formulation |
| CRF | Cross Reference |
| CRF | Connection Related Function |
To get both audio and video lossless, set simple output mode, then Settings->Output->Recording->Recording quality->Lossless Quality, tremendously large file size.
Output Settings Tab
| Video Bitrate | Audio Bitrate |
|---|
| 1080P | 6,000Kbps | 128Kbps |
| 720P | 3,000Kbps | 128Kbps |
| 480P | 1,000Kbps | 128Kbps |
| 360P | 600Kbps | 96Kbps |
Recommended video bitrates for HDR uploads
| Type | Video Bitrate, Standard Frame Rate (24, 25, 30) | Video Bitrate, High Frame Rate (48, 50, 60) |
|---|
| 2160p (4K) | 44–56 Mbps | 66–85 Mbps |
| 1440p (2K) | 20 Mbps | 30 Mbps |
| 1080p | 10 Mbps | 15 Mbps |
| 720p | 6.5 Mbps | 9.5 Mbps |
Normally bicubic is recommended. It's a standard rescale and provides good quality.
In the Settings window, head to the Output tab, and here is where you should see similar settings to that of OBS, but in a less compressed layout. The bitrate will also be set to 2500 Kbps by default, though it only shows the bitrate number, not the 'Kbps' format.
CBR stands for constant bitrate, a control technique which keeps the bitrate constant, but allows video quality to vary. MBR stands for maximum bitrate, a control technique which allows the bit rate to vary, but only up to a maximum value.
CQP specifies a quality level, regardless of how much (or how little) data needs to be captured to achieve that quality level. Streaming sites want non-variable bitrates, but when you're recording it doesn't matter as much.
OBS will take your Base (Canvas) Resolution, filter it using your selected Downscale Filter, and then rescale it based on your select Rescale Output setting. If you wish to stream at the same resolution as your Base (Canvas) Resolution, simply uncheck this box.
B-frames (bi-predictive frames) are like extra Keyframes, but instead of showing up consistently they only show as needed. This is done by looking both at the previous frame, and the upcoming frame, and inserting a new frame as needed.
4y. CQP uses an algorithm that analyses each frame and tries to keep the recording at a similar quality. CQP stands for Constant Quantisation Parameter. The downside is that final file size, and thus bitrate, is unknown.
x265 and x264 are two different video compression standards that are used to compress video in size but still maintain the quality of the video. x264 is an earlier codec and is used in a lot of videos nowdays and x265 is a newer standard.
CRF 17/18 are visually lossless. CRF 0 means, every pixel of the frame will be determined by its own data. CRF 17/18 means, every pixel of the frame will be either determined by its own data or determined from the previous frame if they are identical.
265 is a video compression standard that was designed for the newest generation of high-resolution video. Compared to H. 264, this newer standard offers from 25% to 50% better data compression at the same level of video quality. 265/HEVC supports resolutions up to 8192×4320, which includes 8K UHD as well.
Two pass encoding, also known as multi-pass encoding, is a video encoding strategy used to retain the best quality during conversion. In the first pass of two-pass encoding, the input data from the source clip is analyzed and stored in a log file. Two-pass encoding is almost twice slower than one-pass coding.
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Constant Quantizer/Quality: Encode the file in one pass to a specified quantizer/quality, resulting in a known quality and unknown filesize (as compared to other modes which have known filesize & unknown quality).
Video bitrate is the amount of video data transferred in a certain period. Without a high bitrate, your high resolution and high frame rate video won't look as good as it could.
FFmpeg uses multi-threading by default, so you prob. don't need -threads 0 . If your encode is bottlenecked on a single-threaded filter or decoder, you'll see full load on one core, and light load on many other cores.
10 Ways to Fix the OBS CPU Usage too High
- Downscale your output resolution.
- Use your Graphics Card for Encoding.
- Lower Frame Rate.
- Change your x264 preset.
- Check your sources.
- Close Extra Applications.
- Run all audio sources at the same frequency.
- Free Disk Space.
The way high CPU usage can cause damage is through a high heat output. If your CPU is running at 85°C or higher all the time, then it can be very bad for your CPU in the long run. This is because heat slowly kills your CPU.
How Much CPU Usage is Normal? Normal CPU usage is 2-4% at idle, 10% to 30% when playing less demanding games, up to 70% for more demanding ones, and up to 100% for rendering work. When watching YouTube it should be around 5% up to 15% (total), depending on your CPU, browser and video quality.
The Bottom-Line. Overall, we're huge fans of both software programs but definitely think Streamlabs OBS offers a lot more functionality, has a higher performance value and is overall a better user experience.
The causes of high CPU usage are wide-ranging—and in some cases, surprising. Alternatively, you may have a piece of malware running on your computer that is sucking up all the processing power from your CPU, whether by running several background processes or attempting to spread itself via your email and social media.
If the CPU usage is around 100%, this means that your computer is trying to do more work than it has the capacity for. This is usually OK, but it means that programs may slow down a little. Computers tend to use close to 100% of the CPU when they are doing computationally-intensive things like running games.
Even if you encode with CPU (x264), OBS needs a minimum amount of GPU power to do the video compositing. A GT 710 isn't suited for OBS operation at all. You will get rendering lag with it. Even iGPUs might become overloaded, if you compose your scenes with more than 1 or 2 sources.
"Why does OBS even need to use the GPU?" OBS needs GPU time and resources because it has to composite and render a scene. If you want OBS to require less resources, you must construct additional pylons you'll have to build simpler scenes and scene collections.
