There's not a lot of obvious documentation about how to work with non-SDR color spaces and transfer functions, especially for fixing issues. That's where this gist comes in.
This changes the metadata, losslessly fixing the improperly tagged file so that you don't have to re-encode.
ffmpeg -hide_banner -i input.mov -movflags write_colr+write_gama -c:v copy -colorspace 9 -color_primaries 9 -color_trc 16 -map_metadata 0 -c:a copy -movflags +faststart output.mov
Often we use ffmpeg commands that have esoteric or unmemorizable options. This is my dumping grounds for all the ones I need to remember somewhere. I am posting this publicly in the hope that it can help other people. If anyone has specific questions/suggestions/improvements for a command, please comment. If you're seeking help creating your own ffmpeg command, I recommend using ChatGPT. It may be bad at math, but it's actually really good at coming up with CLI usages, and even writing quick scripts for their use.
Encode a video losslessly for archiving and as a deinterlaced H.264+AAC file for viewing. This was designed for taking the uncompressed (!) Quicktime MOV output of Blackmagic Media Express and shrinking it to something more manageable for archiving as well as viewing. Note the "seek
| "\e[A": history-search-backward | |
| "\e[B": history-search-forward |
| # nick's yt-dlp config | |
| --write-auto-sub | |
| --embed-subs | |
| --embed-metadata | |
| --embed-chapters | |
| # requires https://github.com/QuantumWarpCode/yt-dlp-dearrow | |
| --use-postprocessor DeArrow:when=pre_process | |
| --sponsorblock-remove sponsor,selfpromo | |
| --prefer-free-formats | |
| -o %(uploader)s-%(title)s[%(resolution)s].%(ext)s |
| androidpolice.com###comment-policy | |
| twitter.com##.js-wtf-module | |
| facebook.com###homepage_panel_pagelet | |
| ##[id^="ac-lre-player-ph"] | |
| ##[class$="recvontent"] | |
| slickdeals.net##.fpGridBox:has-text(Bank Advertiser) |
| ### Keybase proof | |
| I hereby claim: | |
| * I am sturmen on github. | |
| * I am sturmen (https://keybase.io/sturmen) on keybase. | |
| * I have a public key ASD9flhSNpM6cHMBocIgZZeR9fpdXZHMb72sPq8u6QqD_wo | |
| To claim this, I am signing this object: |
| #!/bin/sh | |
| set -ex | |
| for i in *.mp4; do | |
| ffmpeg -y -i "$i" -c:v libvpx-vp9 -pass 1 -b:v 2M -crf 30 -threads 8 -speed 4 \ | |
| -pix_fmt yuv420p -tile-columns 6 -frame-parallel 1 \ | |
| -an -f webm /dev/null | |
| ffmpeg -i "$i" -c:v libvpx-vp9 -pass 2 -b:v 2M -crf 30 -threads 8 -speed 2 \ |