My open call is quite simply:
doc = fitz.open(input_path + '\' + file)

I'm experiencing crashes when corrupt PDF files are encountered. I would be happy to pre-screen them if I knew what to look for. I assumed that fitz.open would raise and exception that's passed back to me but instead it's crashing with this information:
error: cannot find startxref
warning: trying to repair broken xref
warning: repairing PDF document
warning: object missing 'endobj' token
error: non-page object in page tree
uncaught exception: non-page object in page tree

I'm attaching my PDF file that is causing the trouble.
I'm using this code to extract images from a large number of PDF files that I've generated using WKHTMLTOPDF. I'm unsure why a few of them are corrupt. I'm working on that end of things.

Is there a different way I can call the open that will cause the exception to be passed back to me so that I can skip the file and move on to the next?

Thank you for your time.

1960s GRUEN Airflight Vintage Pilot Aviators Military Time Jump Hour Watch.pdf

doc = fitz.open(pdf_file)
for page in doc:
pix = page.get_pixmap()
img_file = f'{img_file_prefix}-{page.number}.jpg'
pix.save(img_file)

Will get_pixmap cause the generated JPG image to be too large in the above code? Is there a better way to convert every page in the PDF into a JPG image?

I combined some pages from different PDF files, so the pages have various pase size, as a result printed paper looks ugly if I forget to use "fit to paper size". Is there a way to

1. either set every page will be printed on A4 size. In this way, text/vector-drawing on PDF page will still be text/vector-drawing so it still looks clear
2. or zoom the page.
   2.1 But how to make the page looks clear as before?
   2.2 I have tried the following code code, it works but I don't like lines

    pix.writePNG('r:/tmp.png')
    img = fitz.open('r:/tmp.png')  # open pic as document

so is it possible make it simple?

import fitz
docIn = fitz.open('out - combined.pdf')

docOut = fitz.open()
for idxPage in range(len(docIn)):
    page = docIn[idxPage]

    pix = page.getPixmap()

    pix.writePNG('r:/tmp.png')
    img = fitz.open('r:/tmp.png')  # open pic as document

    rect = img[0].rect  # pic dimension
    pdfbytes = img.convertToPDF()  # make a PDF stream
    img.close()  # no longer needed
    imgPDF = fitz.open("pdf", pdfbytes)  # open stream as PDF
    sizeA4 = fitz.PaperSize("A4")
    page = docOut.newPage(width = sizeA4[0], height = sizeA4[1])
    page.showPDFpage(rect, imgPDF, 0)  # image fills the page

docOut.save("r:/all-my-pics.pdf")
docOut.close()

docIn.close()