X264 is an open source AVC (H.264 / MPEG-4 Part 10) encoding library used by a number of projects across different platforms from Windows to Linux and MacOS X. Microsoft office bit. This command line encoder is an unofficial build for Windows of the x264 source. It can be used by itself, or with a number of GUI packages, including AutoMKV, MeGUI, and StaxRip. General Conclusion: Ultra Fast is generally unusable, very blocky, NVENC Max Performance is a better choice if available. X264 FASTER has the highest overall score, followed by Medium, Slow and Very Fast. Performance impact from FASTER to MEDIUM is up to 50% slower encoding; quality difference is.

The game optimized encoder settings are currently only available when using software (x264) encoding and using Twitch as streaming service. If you use both, you can then enable the 'use optimized encoder settings' found in the Go Live pop-up, where you set your Game and Title. The profile selection is only in effect when 'Use optimized encoder.
Jul 02, 2020 When selecting a x264 you can then adjust the CPU Usage Preset from ultrafast all the way down to slow and placebo. Faster speeds mean the encoder processes the video faster and uses fewer CPU cycles, but is also lower quality. On the other hand, slower speeds mean more CPU power is spent on each frame, and therefore the quality increases.

Preamble

So, you want to learn more about video encoding? How to set up your stream for the best quality given your computer's hardware and connection limitations? Let's start with this video by Tom Scott.

He does a great job of giving a quick primer on how video encoding works, and you will hopefully have a better understanding of the topics and terminology that we'll be going over. All done? Great! Let's get started.

Before we get into the details, let me explain what this guide is not. This is not intended to be a fully detailed technical explanation of how x264 works; there are far better guides out there than what I can provide here. If you're interested in the nitty-gritty, head over to the doom9 forums, FFmpeg docs, or the x264 website and start digging. This is also not intended to be a 'best settings' guide, and I will not recommend any specific settings. This is intended to help you understand how video encoding in general works, and how to better identify potential issues with your settings and help you learn where to look to correct them.

Let me reiterate that there is no such thing as 'best settings'. Every single setup, for every single use case, will be different. As an example, I have 3 different sets of streaming encoding settings for the types of media I stream. Download free lycoming go480 manual pdfforcebackuper. One for fast motion games, one for desktop applications, and another for live video. If you are new to OBS or streaming in general, OBS Studio contains a feature known as the 'Auto-Configuration Wizard' which can be found in the Tools menu. This tool will test your system and your internet connection to determine what it can handle from both an encoding standpoint and a connection stability standpoint. However, the best way to find your best settings is to test, test, and test again.

This guide is focused entirely on streaming with the x264 encoder. This is what the vast majority of OBS users will be using when they stream. For local recordings, your choice of encoder is far less relevant than your actual settings and in many cases a hardware encoder will be better suited for you. You can learn more about local recording settings in this guide here: http://obsproject.com/forum/resources/obs-studio-high-quality-recording-and-multiple-audio-tracks.221/

It is important to understand that video encoding is a very resource intensive process, especially when attempting to do so in real-time. Hardware encoders - such as Nvidia NVENC, Intel QuickSync, or AMD VCE - can help with this as they use special hardware in your system dedicated to the task of video encoding. As a trade-off the overall quality per bitrate is lower than the CPU-based x264 in nearly all cases. For streaming where bitrate is usually a constraining factor, x264 is currently the best option for getting the most quality out of your stream.

Only been in recent years have standard consumer-grade computers reached the point where they can realistically provide the processing power to do live video encoding. Keep all this in mind when you wonder why your 8 year old dual core Pentium CPU cannot encode 1080p 60fps without failing miserably. Even the most powerful consumer CPUs can still struggle with the load of encoding a high-resolution, high-fps stream.

There are two primary components to the x264 encoder we'll be looking at: presets and bitrate.

Presets (anchor: presets)

x264 has several CPU presets, in increasing order from low CPU usage to high CPU usage: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo.

By 'preset', it means exactly what it sounds like: a set of pre-determined settings for x264 so that you don't have to set them all manually yourself to tweak things. These sets of settings have been tested by lots of people and are great for general use, depending on what you want to get out of your encoder. The actual details of what the settings are can be found here: http://dev.beandog.org/x264_preset_reference.html

The basic idea is that, all things being equal (same bitrate, etc), less CPU usage would result in worse quality, and more CPU usage would result in better quality, because the presets change how much time the encoder spends compressing each frame to look good within its setting constraints. Sometimes you need to reduce your CPU usage in order to get good performance, and the higher CPU usage presets can be difficult to use effectively with average consumer CPUs.

The last thing to note is that any preset lower than medium will have significant diminishing returns, and is not really worth the extra CPU cycles for streaming scenarios. Unless you are squinting at two identical streams side by side, you will not notice a difference. That said, if your CPU can handle it, there's no reason (outside your power bills) not to use them.

Here we have put together some comparison examples for how this actually looks in practice.

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x264, 1920x1080, 60fps, 2500kbps bitrate, high-detail low-motion scene:
x264, 1920x1080, 60fps, 2500kbps bitrate, high-motion scene:

All these test are performed with exactly the same source video and bitrate, only the preset has changed.

However, it's important to note that all of this assumes that your PC can handle the preset and resolution/fps that you are trying to encode. If it cannot, you might start to notice skipping or image distortion on your stream, accompanied by the message in OBS stating: Encoding overloaded! The simple way of fixing this issue is to turn down the resolution and FPS of your stream to reduce the load, and failing that, you may need to turn down the preset. You can check our detailed guide on how to troubleshoot encoding issues here: https://obsproject.com/wiki/General-Performance-and-Encoding-Issues

Bitrate (anchor: bitrate)

The amount of energy the CPU spends compressing each frame isn't the only factor in video quality.

Best X264 Encoder