Mux .264 with Interactive Graphics Stream

[wiseant]

Hi [hope this is the right forum]

Allegedly TSRemux can remux BD streams using commandline

I am trying to mux .264 with Interactive Graphics Stream

I know that TSMuxerGUI does not handle IGS

I made a META file:
MUXOPT --no-pcr-on-video-pid --new-audio-pes --vbr --vbv-len=500
V_MPEG4/ISO/AVC, "D:\layer1.264", fps=23.976, insertSEI, contSPS
S_HDMV/PGS, "D:\00001.ies", lang=eng

and then

tsremux d:\meta1.txt d:\meta1.m2ts

with the following error message
Unhandled Exception: System.FormatException: The specified file is too short
at TsRemux.PesFile.GetFileType(FileStream fs)
at TsRemux.PesFile.OpenFile(String path, Boolean useAsync, BackgroundWorker openWorker)
at TsRemux.TsRemux.OpenFile(String filename)
at TsRemux.TsRemux.exec()
at TsRemux.Program.Main(String[] args)

re the S_HDMV/PGS,
I am wondering if this is the correct re
<Name of the codec> <file name>

and also if the PGS/[IGS] should be in m2ts container, or elementary stream or PES - and what should the extension be?
I have tried IGS in m2ts container, and as elementary stream and as PES with m2ts, .ies and .pes extensions and I get the same error message

TIA