How to convert HLG videos to SDR?

[Mounter81]

Hello!

So I have a couple of HLG videos and I want them to be converted to SDR. I have an Intel Gen. 10 i3 with UHD 630 IGP, but no dVGA to do the job.
What programs and setting do you suggest for the task? Please be detailed, I'm quite of a "newbie" to this...

Thank you!

[ProWo]

Post a mediainfo report (text mode) form one of this HLG videos here.

[Swedaniel]

Hello!

So I have a couple of HLG videos and I want them to be converted to SDR. I have an Intel Gen. 10 i3 with UHD 630 IGP, but no dVGA to do the job.
What programs and setting do you suggest for the task? Please be detailed, I'm quite of a "newbie" to this...

Thank you!

Hi, i dont know what HLG is but i seen in this one "Q-Encoder" have some sort of option to change things to HDR, HD SDR and such things! it is listed as v.1.5.6-2 i think the one i tested (it is only mkv, webm formats and VP8, VP9 and AV1 Codecs).

[Mounter81]

General
Format : Matroska
Format version : Version 4
File size : 272 MiB
Duration : 2 min 2 s
Overall bit rate : 18.6 Mb/s
Frame rate : 25.000 FPS
Encoded date : 2023-11-28 17:42:06 UTC
Writing application : mkvmerge v80.0 ('Roundabout') 64-bit
Writing library : libebml v1.4.4 + libmatroska v1.7.1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 min 2 s
Bit rate : 18.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.090
Stream size : 272 MiB (100%)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : HLG
transfer_characteristics_Original : HLG / BT.2020 (10-bit)
Matrix coefficients : BT.2020 non-constant

[ProWo]

Try clever FFmpeg-GUI and select the HDR to SDR option.


[Attachment 75179 - Click to enlarge]

[Swedaniel]

General
Format : Matroska
Format version : Version 4
File size : 272 MiB
Duration : 2 min 2 s
Overall bit rate : 18.6 Mb/s
Frame rate : 25.000 FPS
Encoded date : 2023-11-28 17:42:06 UTC
Writing application : mkvmerge v80.0 ('Roundabout') 64-bit
Writing library : libebml v1.4.4 + libmatroska v1.7.1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5.1@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 min 2 s
Bit rate : 18.6 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.090
Stream size : 272 MiB (100%)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : HLG
transfer_characteristics_Original : HLG / BT.2020 (10-bit)
Matrix coefficients : BT.2020 non-constant

Oopps, hi again, i forgot to mention, the output is mkv/webm + vp8/vp9/av1 codec but the input videos can be many other sources such as mp4, mkv, webm, flv, 3gp, wmv and avi! maybe more! (With Q-Encoder).

[Mounter81]

Try clever FFmpeg-GUI and select the HDR to SDR option.


[Attachment 75179 - Click to enlarge]

Thanks, but I think this one is a no-go: it uses just software encoding, so my CPU loads at full 100% during the process and takes very long time to encode even a small file.

I need something that utilizes my IGP (H.265 intel QSV encoding) so it would be much faster and not squeez up my CPU. Any further ideas?

[Swedaniel]

Damn, the free ones i found with hardware accelration + H.265 HEVC that the conversions is really fast with does not have options for changing to SDR manually!

[usually_quiet]

Try clever FFmpeg-GUI and select the HDR to SDR option.


[Attachment 75179 - Click to enlarge]

Thanks, but I think this one is a no-go: it uses just software encoding, so my CPU loads at full 100% during the process and takes very long time to encode even a small file.

I need something that utilizes my IGP (H.265 intel QSV encoding) so it would be much faster and not squeez up my CPU. Any further ideas?

Would a software video player that tone-maps HLG to SDR so you can enjoy watching the video on an SDR display be enough? ...or do you absolutely need to make a permanent change to the video itself?

[Edit]Haven't you already asked for ways to convert HLG to SDR at doom9? https://forum.doom9.org/showthread.php?p=1994398 If they can't provide an acceptable solution perhaps you will need to wait a little longer. HDR10 to SDR conversion took a while to get to the point where there was an easy way to do it.