Lossless Export Impossible

[MattG9173852]

I've trying to make a lossless export of a video so that I can run a final compression encode later however, not matter what format or setup, my video is always blurred compared to the original video.

I've tried ProRes, DNxHR/DNxHD, image sequences such as TIFF, plugins where there are options for "lossless" exports like AfterCodecs, Voukoder, etc and EVERY TIME it comes out slightly blurry, there has to

be something I'm doing wrong.

I'm starting to go insane. Surely someone can tell me how to achieve this?

I have a small section of the frame here where it is the source:

And here is the issue I've seen on every single export I get:

[R Neil Haugen]

What codec is the original, and what framesize and framerate?

 What is your sequence framesize and framerate?

[MattG9173852]

Here is a copy of the file info from potplayer my video player, I used ffmpeg to create a lossless video file which is this one that I am bringing into Premiere Pro:

Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/mp41)
Frame rate : 23.976 FPS

Video ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L8.5@Main
Codec ID : hev1
Codec ID/Info : High Efficiency Video Coding
Bit rate : 170 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 0)
Bit depth : 10 bits
Scan type : Progressive
Color range : Limited
Matrix coefficients : BT.709
Codec configuration box : hvcC

[Ann Bens]

H.265 is nowhere lossless.

[MattG9173852]

Sorry, I meant to say that I used the lossless preset in ffmpeg, here was the command I used to generate this: ffmpeg -y -i input.mkv -c:v libx265 -x265-params lossless=1 -c:a copy -vf subtitles=input.mkv output.mp4

[Ann Bens]

A real lossless file is huge and I mean huge (avi with no codec)

Try Apple Prores 4444 (quicktime).

Your color management might be a bit off.

[MattG9173852]

I have tried using QuickTime Apple ProRes 4444 and I still get the same blur, I've added the settings I used too:

[R Neil Haugen]

While Ann is as always correct, that's also a bit past what other profesisonals have shown and set for visually lossless productions. With decent settings, for instance, an intraframe like ProRes even down to 422 should be able to go ten or more generations without noticeable loss.

Taking any middle or upper ProRes or DNx variant should not produce any visible losses in the first several generations. So ... something isn't going correctly in the export here.

[MattG9173852]

I have given up on this project, I couldn't find any solution