Call for Help - Advanced Video Editing + HDR & SDR colorspace correction
Hi. I've been making Michigan games available for over a decade now, along with every snap videos. Recently, I've also made games available in 4K, which to my knowledge, no fanbase/team on the face of planet Earth is presently doing (Leaders and Best!).
Recording the handful of games a year in 4K was been made possible with help from another alum that I happened to make a connection with on this board, along with the experience I've gained in the last decade plus hundreds of hours of Googling . With 4K video editing + color space corrections though, I need some help. Perhaps you know someone in the entertainment or video production industry? If you could make that connection for me, I would be forever grateful.
These are the problems I am looking for assistance with -
- Recovering a file that seemingly has glitches/ I-Frame issues. The video file itself is not corrupt but has intermittent glitches (thanks Fox) that prevent me from 'seeking' through the video with open source tools such as AVIDemux. The video plays back just fine in VLC, you just can't seek through it at all without it kicking you back to the beginning. It's bizarre.
- Applying LUT transformations to the video (it's a .ts file with HEVC video with BT.2020 colorspace + 5.1 audio) to yield a SDR file (REC709). Relevant domain knowledge here includes FFMPEG + stuff like this that can be used in Adobe, I think? https://cc-lut.hotglue.me/
- Any experience with an HD Fury Integral (the original version from 2015/2016)
Even if the person you know doesn't have domain knowledge in this, but has industry experience and works with 4K and HDR video workflows and is interested in problem solving, it's always helpful to bounce ideas around as well.
I can be reached at mgovault @ gmail.com
Thanks and Go Blue!
December 5th, 2021 at 5:30 PM ^
Sorry, bro. Way, way way beyond any of my expertise.
December 5th, 2021 at 5:51 PM ^
I feel really bad, because I clicked on this link thinking I'd be able to help someone out for once, as I have been working on architecting display pipes for almost 15 years. And from a very low-level standpoint I can tell you exactly how to do things like transform BT.2020 (or any other arbitrary color space) to Rec.709. Unfortunately, it sounds like you need more practical help making existing software do what you need, and that is very much not my area.
Having said that, if you do actually need help creating LUTs for color space transformation I can probably help.
December 5th, 2021 at 6:17 PM ^
Interesting!
By display piping, do you mean graphics pipeline? (https://en.wikipedia.org/wiki/Graphics_pipeline)
December 5th, 2021 at 8:45 PM ^
No, the Display Pipe is a hardware block, a functional region within a larger SoC (as opposed to the TCON, an external piece of silicon that electrically drives pixels onto the panel).
The Display Pipeline takes a source buffer (typically the output of a GPU or Video Decoder) and pushes it out to the TCON. In my case it's responsible for converting from arbitrary source formats to whatever is appropriate for the panel (i.e. color space, gamma, precision, etc.), applying video timing, and performing any panel-specific correction (say for temperature, brightness, or manufacturing variation)
December 5th, 2021 at 6:00 PM ^
You should be able to transcode the file. If you don't have Adobe suite suite you can use DaVinci. I think there is a free version.
The colour correct is really strong. That is what is what it was originally made for.
You want to make sure all your source materials are consistent. Frame rates, codex, etc. Again you can use DaVinci or Media Encoder if you have it. With 4k files I'd also use proxies. It's way more manageable. You can ingest in DaVinci do the proxies and edit in Premiere.
With regard to the LUT. Do the basic correction first. Set your black and white and basic levels. Match the look across consistently across your shots without enhancement and then apply the LUT.
Then tweak.
There are lots of good YouTube tutorials on colour correct.
December 5th, 2021 at 6:20 PM ^
Thanks for the tips, I appreciate it.
December 11th, 2021 at 7:06 PM ^
ps for people from the future Googling this - reencoding worked, specifically using x264. HEVC reencoding gave me trouble that I'm still trying to work through. The reason I'm still trying to give it a shot is because you need HEVC to keep HLG, x264/h.264 doesn't support HLG/HDR colorspace.
December 5th, 2021 at 6:03 PM ^
My wife works in this area and after reviewing a few links for me said that this is a good (but basic) example: http://forum.doom9.org/archive/index.php/t-175125.html
She says "zscale (what ffmpeg calls) has a few basic tone mappers built in which you can try" and that "tone mapper is not required, but is recommended" and "if you don't like any of the built in tone mappers, the next step is harder" (or something like that).
I just created an account (after reading for 14 years or so) just to finally post this. The past two weekends have increased the desire (to create an account) of course.
December 5th, 2021 at 6:13 PM ^
Welcome, and thank you!
Doom9 is the nexus of technical video stuff. I remember when x264 was being developed back in 2006/2007, the first release of MeGUI...good memories.
I'm pretty sure the technical people who work at Google/YouTube post there...I'm sure YouTube has developed all their own tooling and used open source stuff as building blocks/contribute patches to projects.
I will read this over, thank you!
December 5th, 2021 at 6:09 PM ^
No pressure, but please get this up on the interwebs as soon as possible. I was at the game and really want to watch the broadcast, but FOXSports hasn’t made it available on their app and YouTube searches keep coming up empty. Thanks!
December 5th, 2021 at 6:17 PM ^
Try wiggling the coaxial cable.
December 5th, 2021 at 7:08 PM ^
"Recovering a file that seemingly has glitches/ I-Frame issues. The video file itself is not corrupt but has intermittent glitches (thanks Fox) that prevent me from 'seeking' through the video with open source tools such as AVIDemux. The video plays back just fine in VLC, you just can't seek through it at all without it kicking you back to the beginning. It's bizarre."
Use VLC or OBS or maybe just FFMPEG to just...re-record the video file, so that you CAN seek it.
December 5th, 2021 at 9:45 PM ^
Yeah I'm going to give that a shot tomorrow.
December 5th, 2021 at 8:39 PM ^
Seeking issues, with an otherwise intact video stream, sound like a container issue. You may be able to rebuild the index in the container without remuxing, which not only saves time but prevents a quality degradation. ffmpeg can do that with the copy codec.
December 5th, 2021 at 11:12 PM ^
I am zero help for you, but I have very sincere appreciation for your work - I've spent so many hours viewing your films. Thanks so much
December 15th, 2021 at 7:32 AM ^
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December 28th, 2021 at 11:09 AM ^
...and also since your account is now blocked. It's obvious you are only here for one purpose: to post unsolicited links.
Like with most websites, spam is unwelcome. If you wish to advertise---and pay for it---contact managing editor Seth Fisher @Misopogon on Twitter.