Is 2 pass encoding worth it?

In the Constant Bit Rate encoding mode, files that are encoded in two passes are generally more efficient than files encoded in a single pass. Quality-based VBR, which is one pass, produces more consistent quality than bit-rate-based VBR, which is two-pass.

What codec is x264?

H.264/MPEG-4 AVC
x264 is a free software library and application for encoding video streams into the H. 264/MPEG-4 AVC compression format, and is released under the terms of the GNU GPL.

Does x264 have better quality?

x264 is capable of achieving dramatic performance with encoding four or more 1080p streams in real time on one end-user computer. Compared with other H. 264 encoders, it provides the highest quality with the most advanced psychovisual optimizations available.

What is the difference between VBR 1 pass and 2 pass?

1 pass VBR just encodes ‘on the fly’ and can’t encode frames ‘knowing’ what’s further long in the program. Effect… The first pass in a Variable Bitrate 2 pass encode is an analysis pass which looks at the video content of the program and looks for high motion, low motion and complexity.

What encoder should I use on OBS?

The (New) Nvenc encoder is easily the best OBS encoder available, assuming you have a modern NVIDIA graphics card with the improved ASIC chip. With zero performance impact while encoding and high-quality frames even at low bitrates, it is a strong contender as a streaming encoder.

When should you use x264?

So when is x264 useful? Well, as mentioned before, if you have a killer CPU (like an AMD Ryzen 9), but you also have an AMD graphics card and want to avoid using AMF encoding, you might want to consider using x264 set to faster or fast.

Does x264 use CPU?

x264 uses your CPU to encode video. x264 provides quality preset settings from ultrafast to veryslow/placebo. In basic terms: the slower the preset, the harder your CPU has to work.

What is three pass encoding x264?

Three pass encoding? x264 offers the ability to make an arbitrary number of consecutive passes. If you specify pass=1 on the first pass, then use pass=3 on a subsequent pass, the subsequent pass will both read the statistics from the previous pass, and write its own statistics.

Should I use two pass encoding?

Nearly all of this guide’s comments assume you are using two pass. When comparing options, there are two major reasons for using two pass encoding. First, using two pass often gains around 1dB PSNR, which is a very big difference.

Should I add Nob_adapt to x264encopts?

Unfortunately, the current adaptive B-frame decision algorithm has a strong tendency to avoid B-frames during fades. Until this changes, it may be a good idea to add nob_adapt to your x264encopts, if you expect fades to have a large effect in your particular video clip.

How does the first pass encoding work?

Using the statistics gathered from the first pass encode, the encoder can estimate, with reasonable accuracy, the “cost” (in bits) of encoding any given frame, at any given quantizer. This allows for a much more rational, better planned allocation of bits between the expensive (high-motion) and cheap (low-motion) scenes.