EPUB to PDF Conversion fails for large EPUB

[Hitmanforrent]

What happened?

Dangerzone hangs, then displays "Conversion to PDF with LibreOffice failed" when attempting to convert large EPUBs.

operating system version

Windows 11 Pro, Version 23H2 (0S Build 22631.4541)

Dangerzone version

0.8.0

Docker info

Client:
 Version:           27.3.1
 API version:       1.47
 Go version:        go1.22.7
 Git commit:        ce12230
 Built:             Fri Sep 20 11:42:27 2024
 OS/Arch:           windows/amd64
 Context:           desktop-linux

Server: Docker Desktop 4.36.0 (175267)
 Engine:
  Version:          27.3.1
  API version:      1.47 (minimum version 1.24)
  Go version:       go1.22.7
  Git commit:       41ca978
  Built:            Fri Sep 20 11:41:11 2024
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.7.21
  GitCommit:        472731909fa34bd7bc9c087e4c27943f9835f111
 runc:
  Version:          1.1.13
  GitCommit:        v1.1.13-0-g58aa920
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
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REPOSITORY                    TAG       IMAGE ID       CREATED       SIZE
dangerzone.rocks/dangerzone   latest    08ad768f7087   5 weeks ago   1.57GB
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c1ec31eb5944: Download complete
Digest: sha256:305243c734571da2d100c8c8b3c3167a098cab6049c9a5b066b6021a60fcb966
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

Document conversion logs

'C:\Program Files (x86)\Dangerzone\dangerzone-cli.exe' 'C:\Users\Ashley Green\Desktop\V1.epub\
ParserError:
Line |
   1 |  … am Files (x86)\Dangerzone\dangerzone-cli.exe" C:\Users\Ashley Green\D …
     |                                                  ~~~~~~~~~~~~~~~
     | Unexpected token 'C:\Users\Ashley Green\Desktop\V1.epub' in expression or statement.

Additional info

No response

[apyrgio]

Hm, I think the conversion command failed because you did not close the ' quote character, and used a separator \ instead. Could you try again with:

'C:\Program Files (x86)\Dangerzone\dangerzone-cli.exe' 'C:\Users\Ashley Green\Desktop\V1.epub'

Also, how many pages is your EPUB file? If we're talking about thousands of pages, it may be the case that you're running out of RAM, since the rasterized version of each page is much large than the text source.

[apyrgio]

Also, I just ran Dangerzone against a very large .epub file, and I see this error message:

Number of pages exceeds maximum (10000)

If you see something similar, then that's expected I'm afraid. We have some sane limits for the number of pages in a document, so that you don't end up with a PDF that is in the order of gigabytes 🫤 (if the conversion process completes at all).

[Hitmanforrent]

Hm, I think the conversion command failed because you did not close the ' quote character, and used a separator \ instead. Could you try again with:

'C:\Program Files (x86)\Dangerzone\dangerzone-cli.exe' 'C:\Users\Ashley Green\Desktop\V1.epub'

Also, how many pages is your EPUB file? If we're talking about thousands of pages, it may be the case that you're running out of RAM, since the rasterized version of each page is much large than the text source.

Still get:
'C:\Program Files (x86)\Dangerzone\dangerzone-cli.exe' 'C:\Users\Ashley Green\Desktop\V1.epub'
ParserError:
Line |
1 | … angerzone\dangerzone-cli.exe' 'C:\Users\Ashley Green\Desktop\V1.epub'
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Unexpected token ''C:\Users\Ashley Green\Desktop\V1.epub'' in expression or statement.

It's 210 pages.

[Hitmanforrent]

Also, I just ran Dangerzone against a very large .epub file, and I see this error message:

Number of pages exceeds maximum (10000)

If you see something similar, then that's expected I'm afraid. We have some sane limits for the number of pages in a document, so that you don't end up with a PDF that is in the order of gigabytes 🫤 (if the conversion process completes at all).

Yeah those limits are fair enough lol. Strangely though, when using the desktop app I'm getting the error "Conversion to PDF with LibreOffice failed." I don't really see anything in the documentation about it. I have LibreOffice installed if that matters.

[Hitmanforrent]

It may just be this specific file. Saved a copy of it with Calibre and Dangerzone converts that just fine.

[apyrgio]

I'm getting the error "Conversion to PDF with LibreOffice failed."

... damn. I missed this error message on your first post. Well, the LibreOffice that you see in the message is actually installed in the Dangerzone container image. What's weird though is that LibreOffice is not supposed to be used internally when converting EPUB files. Most likely this file has a signature (MIME type) that confused Dangerzone. If we could find out the MIME type of the file (see example), it would help for future files.