Only applies to 8-bit x264 (10-bit x264 quantizer scale is 0-63). Note: The CRF quantizer scale mentioned on this page If the output looks good, then try a higher value and if it looks bad General usage is toĬhoose the highest CRF value that still provides an acceptable quality. The bitrate while -6 is roughly twice the bitrate. The range is exponential, so increasing the CRF value +6 is roughly half Or nearly so: it should look the same or nearly the same as the input A lower value is a higher quality andĪ subjectively sane range is 18-28.

The range of the quantizer scale is 0-51: where 0 is lossless, 23 isĭefault, and 51 is worst possible. Theĭownside is that you can't tell it to get a specific filesize or not go Eachįrame gets the bitrate it needs to keep the requested quality level. This provides maximum compression efficiency with a single pass. Quality for the whole file when output file size is of less importance. This method allows the encoder to attempt to achieve a certain output If you need help compiling and installing libx264 see one of our FFmpeg and x264 compiling guides. This will determine the file size and also how

The rate control is a method that will decide how many bits will be There are two rate control modes that are usually suggested for general use: Constant Rate Factor (CRF) or Two-Pass ABR. The goal of this guide is to inform new users how to create a high-quality H.264 video.

Ffmpeg crf example