pdf_thumbnail.py

async def get_pdf_first_page(executors_manager: ExecutorsManager, src_path, dst_path, *, dpi=72, png=False):
    """Try to get a first page of the given pdf-file with GS, ignoring all errors."""
    command = [
        'gs',
        '-q',
        f'-r{dpi}',
        '-dTextAlphaBits=4',
        '-dGraphicsAlphaBits=4',
    ]
    if png:
        command += [
            '-sDEVICE=png16m',
        ]
    else:
        command += [
            '-sDEVICE=jpeg',
            '-dJPEGQ=85',
        ]
    command += [
        '-dDOINTERPOLATE',
        '-dSAFER',
        '-dBATCH',
        '-dNOPAUSE',
        '-dFirstPage=1',
        '-dLastPage=1',
        f'-sOutputFile="{dst_path}"',
        src_path,
    ]
    stdout, stderr, code = await executors_manager.run_cpu_bounded_coroutine(
        run_command,
        command
    )
    return code, stderr