MKVs failing BT.709 transfer characteristics

Hi There,

I recently transferred a few NTSC VHS tapes with the previous version v2025-04-21 of vrecord and all of my files failed both BT.601 color primaries and BT.709 transfer characteristics in MediaConch.

I have 2 questions:

When I look at the MediaInfo report, it shows that the file has a BT.601 matrix coefficient. I know that transfer characteristics, color primaries and matrix coefficients are all different but is it safe to assume that if the matrix coefficient is BT.601 then the color primaries are as well?

As far as the BT.709 transfer characteristics it looks like this metadata is simply missing from the files? If it is missing how do I check for it? If I am wrong then what is the issue?

All of the logs [MediaInfo report](https://www.dropbox.com/scl/fi/wdbfr8875v471wpcakmwj/sihsfa_1989_010_021a_p.mkv_MediaInfo.xml?rlkey=3gmff1mczjap0zfn45une1iw5&st=9bx1x4sx&dl=0) and files created are in [this Dropbox folder](https://www.dropbox.com/scl/fo/nenuhg9mi5r4vcjreheau/AJNrkGEEl1s3MCwrB5CkJsU?rlkey=5qaduq42rzjkliqkvmemtu8ep&st=eq5vep5w&dl=0):

I am using this policy for in-house QC which is slightly different from the one vrecord uses:

```

24
PCM
48000
mkv
Matroska
4



0
10
4:2:2
YUV
Limited
Lossless
Per slice
24
FFV1
N=1
3.4
CFR
Interlaced
BT.709
720

BT.601 NTSC
29.970
486
BT.601
BFF
NTSC

1.347
0.909

```

I did update vrecord this morning to the v2025-07-25 version and now all my files are passing. This is good, but doesn't answer the question of if I should pass the files I made with the previous version. Obviously I would like to avoid transferring the tapes again if possible.