MXF identified as MPEG2-PS when using JS/WASM sample

I have an MXF file which is incorrectly being parsed as an MPEG2-PS file (output results attached) when uploading at:

https://mediaarea.net/MediaInfoOnline

The problem file is correctly identified using the MediaInfo CLI. (output results attached)

I have also attached the mediatrace for the working scenario. I cannot get some code to work which uses the buffer method AND also outputs mediatrace. If I could have, I expect that would have been useful.

The sample file is quite large and also confidential, I can provide access to it if you need in a less public message.

What I have worked out is the following:

• when opening via the CLI, the MXF file parser is selected based on the ".mxf" extension, and parsing proceeds as expected.
• when opening via browser or buffers, the multiple file parsing logic is used to select a parser. The MPEG2-PS parser is tried before the MXF parser. It is accepted for this MXF, but not any others. If I disable the MPEG2-PS parser then the MXF parser is selected and parsing proceeds as normal.

What I haven't been able to identify is where or why in the code base, the MPEG2-PS parser rejects other MXF files, but accepts this one?!

As I said, this is reproducible using the installed CLI and the online service, however I was also using the following hacked example app where I ran the same file through the file based and buffer based interfaces and got the different format identification results:

int main(int argc, char* argv_ansi[])
{
    MediaInfo MI;
    MI.Open(__T("problem1.mxf"));
    STRINGOUT(MI.Get(Stream_General, 0, __T("Format")));

    FILE* F = fopen("problem1.mxf", "rb");

    unsigned char* From_Buffer = new unsigned char[10 * 1024 * 1024];
    size_t From_Buffer_Size;

    fseek(F, 0, SEEK_END);
    long F_Size = ftell(F);
    fseek(F, 0, SEEK_SET);

    MI.Open_Buffer_Init(F_Size, 0);
    do {
        From_Buffer_Size = fread(From_Buffer, 1, 10 * 1024 * 1024, F);
        size_t Status = MI.Open_Buffer_Continue(From_Buffer, From_Buffer_Size);
        if (Status & 0x08) {
            break;
        }
        if (MI.Open_Buffer_Continue_GoTo_Get()!=(MediaInfo_int64u)-1) {
            fseek(F, (long)MI.Open_Buffer_Continue_GoTo_Get(), SEEK_SET);
            MI.Open_Buffer_Init(F_Size, ftell(F));
        }
    }
    while (From_Buffer_Size > 0);
    MI.Open_Buffer_Finalize();
    STRINGOUT(MI.Get(Stream_General, 0, __T("Format")));
}

correct-result.txt incorrect-result.txt cli-working-mediatrace.txt

@JeromeMartinez sorry to ping, but wondering if you had a chance to read this issue and if you have any ideas? I am happy to dig further and help with a fix, but I would need a bit of direction in where to look.

Thanks Nick

Didn't take the time yet to dig in it (I have some stuff to finish for sponsors first) but in my todo-list.