Re: Corrupt PDF files with LMTX?

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

On 24.04.21 08:03, Jairo A. del Rio wrote:
> Hi, list!
> When I try to convert a PDF generated by ConTeXt LMTX to PNG using
> ImageMagick's convert the following happens:
> 
>     **** Error: stream Length incorrect.
>                 Output may be incorrect.
>     **** Error:  An error occurred while reading an XREF table.
>     **** The file has been damaged.  This may have been caused
>     **** by a problem while converting or transfering the file.
>     **** Ghostscript will attempt to recover the data.
>     **** However, the output may be incorrect.
> Error: /ioerror in --runpdf--
> Operand stack:
>     post_eof_count   4096   --nostringval--   4571
> Execution stack:
>     %interp_exit   .runexec2   --nostringval--   runpdf   --nostringval--
> 2   %stopped_push   --nostringval--   runpdf   runpdf   false   1
> %stopped_push   1990   1   3   %oparray_pop   1989   1   3   %oparray_pop
> 1977   1   3   %oparray_pop   1978   1   3   %oparray_pop   runpdf   runpdf
>    runpdf   runpdf   runpdf   runpdf   runpdf
> Dictionary stack:
>     --dict:735/1123(ro)(G)--   --dict:1/20(G)--   --dict:80/200(L)--
> --dict:80/200(L)--   --dict:135/256(ro)(G)--   --dict:315/325(ro)(G)--
> --dict:28/32(L)--
> Current allocation mode is local
> GPL Ghostscript 9.50: Unrecoverable error, exit code 1
> convert-im6.q16: FailedToExecuteCommand `'gs' -sstdout=%stderr -dQUIET
> -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000
> -dAlignToPixels=0 -dGridFitTT=2 '-sDEVICE=pngalpha' -dTextAlphaBits=4
> -dGraphicsAlphaBits=4 '-r300x300'
>   '-sOutputFile=/tmp/magick-55690XUwDR8veJQEc%d'
> '-f/tmp/magick-55690zbxNvSPCVCYe' '-f/tmp/magick-55690aVvG11u3p8wd'' (1) @
> error/pdf.c/InvokePDFDelegate/291.
> convert-im6.q16: no images defined `151.png' @
> error/convert.c/ConvertImageCommand/3258.
> 
> I'd blame ImageMagick, except for the fact that 1) other converters fail
> too and 2) it doesn't happen with ConTeXt MkIV (PDF is successfully
> converted).
> 
> Cordially,
> 
> Jairo

Very interesting! I have seen similar behavior these past days (I think 
it's very recent) but thought it was something in my documents. Hans, MWE:

I have two test files, simply with

\starttext

Test

\stoptext

I try to concatenate the resulting pdf files with qpdf:

qpdf test1.pdf --pages test1.pdf test2.pdf -- result.pdf

And I get these warnings (though the resulting file appears to be OK):

WARNING: test1.pdf (xref stream: object 18 0, offset 4154): expected 
endstream
WARNING: test1.pdf (xref stream: object 18 0, offset 4078): attempting 
to recover stream length
WARNING: test1.pdf (xref stream: object 18 0, offset 4078): recovered 
stream length: 64
WARNING: test1.pdf (object 3 0, offset 4179): expected endstream
WARNING: test1.pdf (object 3 0, offset 2982): attempting to recover 
stream length
WARNING: test1.pdf (object 3 0, offset 2982): recovered stream length: 887
WARNING: test2.pdf (xref stream: object 18 0, offset 4215): expected 
endstream
WARNING: test2.pdf (xref stream: object 18 0, offset 4139): attempting 
to recover stream length
WARNING: test2.pdf (xref stream: object 18 0, offset 4139): recovered 
stream length: 65
WARNING: test2.pdf (object 3 0, offset 4241): expected endstream
WARNING: test2.pdf (object 3 0, offset 3050): attempting to recover 
stream length
WARNING: test2.pdf (object 3 0, offset 3050): recovered stream length: 880
qpdf: operation succeeded with warnings; resulting file may have some 
problems



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