Ffmpeg crf

1. What is FFmpeg CRF?
2. Is CRF 0 lossless?
3. What is a FFmpeg codec?
4. What is x264 CRF?
5. What is yuv420p format?
6. What CRF good?
7. Is X264 lossless?
8. What is CRF OBS?
9. Does ffmpeg use CPU or GPU?
10. Does ffmpeg use GPU?
11. Is VLC based on FFmpeg?
12. Does Chrome use FFmpeg?
13. What software uses FFmpeg?

What is FFmpeg CRF?

Constant rate factor (CRF) is an encoding mode that adjusts the file data rate up or down to achieve a selected quality level rather than a specific data rate. ... This tells FFmpeg to encode at a quality level of 23, but to cap the data rate at 6750 kbps with a VBV buffer of 4500 kbps.

Is CRF 0 lossless?

The range of the CRF scale is 0–51, where 0 is lossless, 23 is the default, and 51 is worst quality possible. A lower value generally leads to higher quality, and a subjectively sane range is 17–28.

What is a FFmpeg codec?

FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool itself, designed for processing of video and audio files.

What is x264 CRF?

The Constant Rate Factor (CRF) is the default quality (and rate control) setting for the x264 and x265 encoders, and it's also available for libvpx. ... For x264, sane values are between 18 and 28. The default is 23, so you can use this as a starting point.

What is yuv420p format?

yuv420p is a common 8-bit and yuv420p10le a 10-bit pixel format. The library libx264 supports both, but you cannot combine 8-bit and 10-bit in the same command, you need two commands. By default the library libx264 will use the chroma subsampling scheme that matches closest the input file's chroma subsampling.

What CRF good?

VMAF 93 = Good Enough

So, if you're using CRF 20, you're almost certainly delivering a VMAF quality that's higher than 93-95 (since lower CRF values deliver higher quality). This means that the data rate on all videos that you distribute is likely too high, or at least higher than it needs to be.

Is X264 lossless?

Based on what is said on ffmpeg h264 documentation with the -qp 0 or -crf 0 options libx264 should work in lossless mode. You can use -qp 0 or -crf 0 to encode a lossless output. Use of -qp is recommended over -crf for lossless because 8-bit and 10-bit x264 use different -crf values for lossless.

What is CRF OBS?

CRF (Constant Rate Factor)

Does ffmpeg use CPU or GPU?

the CPU% has been more than 90 (375%). In case of ImageMagick, if I enable opencl while configuring, then the app will run in GPU, i.e., the CPU% will be less than 90. I noticed that. But in case of ffmpeg, it is GPU accelerated one.

Does ffmpeg use GPU?

FFmpeg uses Video Codec SDK

If you have an NVIDIA GPU which supports hardware-accelerated video encoding and decoding, it's simply a matter of compiling FFmpeg binary with the required support for NVIDIA libraries and using the resulting binaries to speed up video encoding/decoding. ... Hardware-accelerated encoding of H.

Is VLC based on FFmpeg?

The libavcodec library from the FFmpeg project provides many of VLC's codecs, but the player mainly uses its own muxers and demuxers.

Does Chrome use FFmpeg?

Chrome uses FFmpeg to decode mp4 video and Firefox uses whatever the host system provides. The different background colors is to indicate transparency as the video isn't actually shown with the alpha channel available.

What software uses FFmpeg?

Projects that use FFmpeg libraries include Google Chrome, VLC, and many more.