PDF/A export, different results (headless vs. GUI)

[ulry]

Exporting a document as PDF/A seams to work both ways
a) via GUI, with a warning about the transparency which is not allowed for PDF/A ==> perfect
b) command line, headless, no warning ==> the pdf will be created and is readable

But when checking the outputs from a) and b) above via the online check tool

PDF Tools AG - components and solutions for PDF and PDF/A

document from a) passes the check, where doc from b) is invalid

• The value for SelectPdfVersion is set to one in the registrymodifications.xcu file.
• Using unoconv -f pdf -eSelectPdfVersion=1 etc. works, but is not really a beautiful solution in my context

Any hints?
Thank you.

[Kruno]

I can’t figure out from your question does PDF after that unoconv command passes validation? Just as a reference: convert files to PDF/A on command line, headless mode [closed]; Unconv and LibreOffice at Ask Ubuntu

[Kruno]

I’m on GNU/Linux with LibreOffice 5.1.5 installed in /opt/libreoffice5.1 and this command is working for me:

libreoffice5.1 --headless --convert-to pdf:writer_pdf_Export file.odt

And yes, you have to have ‘1’ in SelectPdfVersion in registrymodifications.xcu.

My test file passed validation.

See also Convert to command line parametar.