Rockbox

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bugs
  • Category Plugins
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version Daily build (which?)
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by Luke Spangler - 2017-12-20

FS#13141 - Imageviewer cannot render JPEGs properly with a 1x2,1x2,1x2 chroma sampling factor

Bug exists in the DEV builds for, at least, Sansa Clip+, Sansa Fuze+, and iPod Video for at least a year, although I cannot confirm this as I've only just now tracked down the problem. The issue was discovered because imagemagick occasionally selects 1x2,1x2,1x2 as the chroma sampling factor when converting an image.

To recreate this bug, convert any image using imagemagick to a JPEG with that chroma sampling factor and attempt to view it in Rockbox. What you will see is a nonsensical image to the size of the original JPEG. Any desktop image viewer, like eyeofgnome, renders the picture correctly.

I've also included a sample Rockbox logo generated in the faulty fashion along with this bug. To create it, run this command in a Unix-like with imagemagick and curl installed: 'curl -J -L "https://www.rockbox.org/rockbox400.png" | convert - -sampling-factor 1x2,1x2,1x2 -quality 100 folder.jpg'

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