[vdr] clarification request: vdr file format?

[jik jikman]

Hi,

I searched internet many times to find vdr file format, but I found
many different results.

Some sites say it is pva format, some other say it is pes format and
other say it is ts format without pat/pmt tables.

What is vdr file format at last? and why we can't record directly in
mpg ( mpeg ps ) format as we can do in windows?

I know how I must convert it to other formats, but I cant understand
why we can't directly record in mpg?

Thanks.