Report what compression schemes are different studios using and why. In particular what FFMPEG options are people using, although recommendations on other encoders are welcomeFFmpeg is frequently used by different studios for encoding their media, however the documentation for ffmpeg is often poor, or cryptic so its often harder than it should be to come up with a good starting point. We are aiming to come up with recommendations for different scenarios as well as document what the different flags are doing with the aim to make this easier to get to a good baseline.
| Table of Contents |
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Overview
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- Best color preservation for output to:
- Web, OSX and Mac
- Common applications: e.g. RV, Nuke.
- Rec709, P3, rec2020 and HDR.
- Codec recommendations for:
- Proxy H264 playback (e.g. web streaming), should be setup for web streaming.Quality
- Animation/Modelling/Layout movie playback. - Good enough for given tasks (e.g. what's good enough for animation may not be good enough for lighting/compositingsomewhat lower quality playback, but should always provide smooth motion.
- Lookdev/lighting/compositing movie playback - should have excellent color fidelity and minimal encoding artifacts
- Should any filmlook be baked in, or should we assume that is always applied during viewing.
- How much should we be able to adjust color and have the image hold up? (Or rely on exr's for that?).
- Export to editorial.
- High-resolution or frame rate - e.g. 4k, 8k, 60fps, 120fps.
- Stereo or VR.
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https://netflixtechblog.com/toward-a-practical-perceptual-video-quality-metric-653f208b9652
https://github.com/Netflix/vmaf
https://ottverse.com/vmaf-ffmpeg-ubuntu-compilation-installation-usage-guide/ - building VMAF on ubuntu.
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| Name | Source | ffmpeg flags | Description | Size |
|---|---|---|---|---|
| colorspace_yuv444p10le | https://trac.ffmpeg.org/wiki/colorspace | -c:v libx264 -preset placebo -qp 0 -x264-params "keyint=15:no-deblock=1" -pix_fmt yuv444p10le -sws_flags spline+accurate_rnd+full_chroma_int -vf "colorspace=bt709:iall=bt601-6-625:fast=1" -color_range 1 -colorspace 1 -color_primaries 1 -color_trc 1 | ||
| Prores 4444Prores 4444 | -c:v prores_ks -profile:v 4444 -qscale:v 1 -pix_fmt yuv444p10le -sws_flags spline+accurate_rnd+full_chroma_int -vf "colorspace=bt709:iall=bt601-6-625:fast=1" -color_range 1 -colorspace 1 -color_primaries 1 -color_trc 1 | |||
| -profile:v 4444 is equivalent to -profile:v 4 | ||||
| shotgun_diy_encode | https://support.shotgunsoftware.com/hc/en-us/articles/219030418-Do-it-yourself-DIY-transcoding', | -vcodec libx264 -pix_fmt yuv420p -g 30 -vprofile high -bf 0 -crf 2 | ||
| Prores 422 HQ | Some FFMpeg commands I need to remember for converting footage for video editing. http://bit.ly/vidsnippets · GitHub |
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Note the -profile:v 3 is equivalent to -profile:v hq | ||||