Error Converting Zip Files w/ Multiple Formats

[TheHeartlessHero]

So I was converting some manga for use on my Sony Reader when I discovered an issue. Some of my files were not being converted into CBZ formats upon adding to calibre and would not convert into LRF. I looked into it and thought at first it was an issue with PNG files but have since discovered it is not. What is happening is that I have a zip file with both JPG images and PNG images in it. This causes calibre to to give an error resulting in an unconvertible file. One solution I found was to convert the files into one type of image (i.e. all png or or jpg), create a new archive, and it will then convert properly. Not sure if this has already been mentioned but I figured if it hasn't, some others could possibly benefit. Maybe a future version will be able to correct this so multi-format archived files can be converted properly.

ValueError:Could no find an ebook inside the archive

Traceback (most recent call last):
  File "site-packages\calibre\gui2\ui.py", line 1800, in convert_ebook
  File "site-packages\calibre\gui2\tools.py", line 39, in convert_single_ebook
  File "site-packages\calibre\gui2\convert\single.py", line 124, in __init__
  File "site-packages\calibre\gui2\convert\single.py", line 163, in setup_pipeline
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 483, in __init__
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 561, in unarchive
  File "site-packages\calibre\ebooks\conversion\plumber.py", line 572, in find_html_index
ValueError: Could not find an ebook inside the archive

[banjomike]

Just try renaming the .zip file to .cbz before dragging it into Calibre, then Calibre will ASSUME it is a comic.

I created a zip file with a gif, a png, and a jpg, all different sizes (attached below). When it is named .cbz it imports and convert to lrf OK. If I name it .zip it does what you describe above.

I hope I read your problem correctly.

[TheHeartlessHero]

Yeah, that was my problem exactly. Good to know just renaming to CBZ will fix it. I'm sure a future update will fix the original problem in the first place. Thanks for the tip.

Another thing I just noticed is that when you import a cbz file, you can see a thumbnail of the first page. If you import a zip file and it's converted to a cbz file, you don't get that thumbnail.