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1. What is -crf used for in FFmpeg? - Super User
superuser.com
Link: https://superuser.com/questions/677576/what-is-crf-used-for-in-ffmpeg
Description: webThe crf flag ensures a variable bitrate for constant quality, if I understand the page linked below correctly. The default range is from 4 to 63, but it can be tweaked further. Have a look at https://trac.ffmpeg.org/wiki/Encode/VP9 for more information.
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2. Encode/H.264 – FFmpeg
ffmpeg.org
Link: https://trac.ffmpeg.org/wiki/Encode/H.264
Description: webSep 23, 2023 · 1. Choose a CRF value. The range of the CRF scale is 0–51, where 0 is lossless (for 8 bit only, for 10 bit use -qp 0), 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.
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3. CRF Guide (Constant Rate Factor in x264, x265 and libvpx)
slhck.info
Link: https://slhck.info/video/2017/02/24/crf-guide.html
Description: webFeb 24, 2017 · ffmpeg -i input.mp4 -c:v libx264 -crf 23 output.mp4. For x265, the default CRF is 28: ffmpeg -i input.mp4 -c:v libx265 -crf 28 output.mp4. For libvpx, there is no default, and CRF can range between 0 and 63. 31 is recommended for 1080p HD video: ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 31 -b:v 0 output.mkv.
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4. Encode/H.265 – FFmpeg
ffmpeg.org
Link: https://trac.ffmpeg.org/wiki/Encode/H.265
Description: webMay 17, 2023 · Similar to x264, the x265 encoder has multiple rate control algorithms, including: 1-pass target bitrate (by setting -b:v ) 2-pass target bitrate. Constant Rate Factor (CRF) In this guide we are going to focus on CRF and Two-Pass encoding, as 1-pass target bitrate encoding is not recommended.
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5. Will I get any visual benefit if I use CRF values below 17/18 in …
superuser.com
Link: https://superuser.com/questions/1448982/will-i-get-any-visual-benefit-if-i-use-crf-values-below-17-18-in-x264-ffmpeg
Description: webJun 15, 2019 · 12. Will I get any visual benefit if I use CRF (Constant Rate Factor) values below 17/18 in x264 (FFmpeg)? Will there be any differences other than size? CRF 17/18 are visually lossless. CRF 0 means, every pixel of the frame will be determined by its own data.
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6. Encode/VP9 – FFmpeg
ffmpeg.org
Link: https://trac.ffmpeg.org/wiki/Encode/VP9
Description: webJan 8, 2024 · Constant quality 2-pass is invoked by setting -b:v to zero and specifiying a quality level using the -crf switch: ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 0 -crf 30 -pass 1 -an -f null /dev/null && \ ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 0 -crf 30 -pass 2 …
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7. ffmpeg Documentation
ffmpeg.org
Link: https://ffmpeg.org/ffmpeg.html
Description: webffmpeg [global_options] {[input_file_options] -i input_url} ... {[output_file_options] output_url} ... 2 Description. ffmpeg is a universal media converter. It can read a wide variety of inputs - including live grabbing/recording devices - filter, and transcode them into a …
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8. What's the difference with crf and qp in ffmpeg? - Stack Overflow
stackoverflow.com
Link: https://stackoverflow.com/questions/40668616/whats-the-difference-with-crf-and-qp-in-ffmpeg
Description: webNov 18, 2016 · Sep 23, 2021 at 13:25. 1. In x264 for 10 bit crf of minus 12 (-12) is lossless and has a range from -12 to 51 while in ffmpeg it is 0 to 63. That way 0 should be lossless but in some cases it is not if it somehow selects profile (like high 10 or high 422) that does not support lossless.
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9. Cheat sheets and -preset settings that actually work with FFmpeg …
superuser.com
Link: https://superuser.com/questions/490683/cheat-sheets-and-preset-settings-that-actually-work-with-ffmpeg-1-0
Description: web3 Answers. Sorted by: 75. FFmpeg does not include text file based presets and profiles anymore for libx264, i.e. what you've used with the -vpre option. These have been deprecated and removed in favor of accessing the actual x264 presets, profiles (and tunes) with the -preset, -profile:v, and -tune options.
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10. CBR, CRF, and Changing Resolution using FFmpeg - OTTVerse
ottverse.com
Link: https://ottverse.com/cbr-crf-changing-resolution-using-ffmpeg/
Description: webOct 6, 2021 · Using the Constant Rate Factor (CRF) option to set desired quality. Change the resolution of the video to 1280x720 or 720p. For this purpose, we would be using a sample video with a resolution = 1920x1080 that can be downloaded at this link . Table of Contents. Creating a Constant BitRate (CBR) Video. Using the CRF option to set desired quality.