Using my own instance, https://youtube.fam-ribbers.com (API on https://api.youtube.fam-ribbers.com and proxy on https://proxy.youtube.fam-ribbers.com), any video thumbnail fails to load. However putting it's URL in the browser appears to work just fine. Example of a thumbnail failing to load: https://proxy.youtube.fam-ribbers.com/vi/XFJRcVg2QmE/hq720.jpg?sqp=-oaymwEcCOgCEMoBSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLAczJ_9TlLHrJBM_rAYjIyihAAAtQ&host=i.ytimg.com
Sorry forgot to post the full error message: qrc:/qt/qml/org/kde/plasmatube/ui/components/VideoGridItem.qml:61:9: QML QQuickImage: Error decoding: https://proxy.youtube.fam-ribbers.com/vi/XFJRcVg2QmE/hq720.jpg?sqp=-oaymwEcCOgCEMoBSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLAczJ_9TlLHrJBM_rAYjIyihAAAtQ&host=i.ytimg.com: Unsupported image format
Oh I can't test it since you're 502'ing now, but can you check what image format it's actually reporting? I wonder if you don't have that built-into your qtimageformats
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
*** Bug 478153 has been marked as a duplicate of this bug. ***
The problem occurs on other instances too. For example https://pipedproxy.kavin.rocks/vi/NcJF-R1DGQ8/hqdefault.jpg?host=i.ytimg.com&qhash=5af0f5be&rs=AOn4CLCTBgkOkpx5A2Kwz9jSyYhVyIj6vw&sqp=-oaymwEcCNACELwBSFXyq4qpAw4IARUAAIhCGAFwAcABBg%3D%3D: fails to load as well. How do I check what image format it thinks it is? It isn't printed to stdout.
I talked with Joshua over Matrix and we found the problem. The system didn't have Qt6ImageFormats installed (only the Qt5 variant) and that's required for WebP images, which piped uses. After installing it the problem was resolved.