AVIF - image format unsupported

[Paul Webster]

I came across an issue with some station logos not being displayed.

The reason is that they were of type image/avif - which is not supported by LMS.

An example

[22-05-24 13:43:37.4116] Slim::Web::Graphics::artworkRequest (83) Artwork request: imageproxy/https://images.feierfreund.de/files/streams/ff_stream-tile_karneval.png?auto=format&w=180&h=180&dpr=2/image_1024x1024_f.png
[22-05-24 13:43:37.4124] Slim::Web::Graphics::artworkRequest (123)   Resize specification: 1024x1024_f.png
[22-05-24 13:43:37.4129] Slim::Web::ImageProxy::getImage (110) Get artwork for URL: imageproxy/https://images.feierfreund.de/files/streams/ff_stream-tile_karneval.png?auto=format&w=180&h=180&dpr=2/image_1024x1024_f.png
[22-05-24 13:43:37.4181] Slim::Web::ImageProxy::__ANON__ (151) Found URL to get artwork: https://images.feierfreund.de/files/streams/ff_stream-tile_karneval.png?auto=format&w=180&h=180&dpr=2
[22-05-24 13:43:37.6300] Slim::Web::ImageProxy::_gotArtwork (217) Received artwork of type image/avif and 18196 bytes length
[22-05-24 13:43:37.6314] Slim::Utils::ImageResizer::sync_resize (148) Error resizing : Can't resize unknown type, magic: "\0\0\0 ftyp"

[22-05-24 13:43:37.6322] Slim::Web::ImageProxy::__ANON__ (318)   Resize failed, returning 500
[22-05-24 13:43:37.6327] Slim::Web::ImageProxy::__ANON__ (319) Artwork resize for imageproxy/https://images.feierfreund.de/files/streams/ff_stream-tile_karneval.png?auto=format&w=180&h=180&dpr=2/image_1024x1024_f.png failed

The parameters on the end of their URL were resulting in the remote site re-encoding the original file (similar to LMS imageresizer) and returning it as image/avif so I modified my plugin to strip them from the URL before using it ... and it worked. While this is OK for me for now, I can imagine that avif might appear from other sources in the future so might need handling in LMS and converting to a format handled by the players/controllers.

Note - if it is supported then might need to check more magic bytes anyway - see
https://github.com/bigcat88/pillow_heif/issues/8

[mherger]

> I came across an issue with some station logos not being displayed.
>
> The reason is that they were of type image/avif - which is not supported
> by LMS.

Now that's really odd... I tried your URL, and it would download an
image. Not what you'd expect, but some people in a pool having a good
time. No matter how I changed parameters for LMS' imageproxy or the
original URL: LMS would always return that image.

I then took that image and did a reverse image search - which indeed
lead me to feierfreund.de! And there it is, hardly visible, behind a
large pinkish rectangle almost at the top. People having a pool party.

Which makes me wonder: the url you tried to load clearly is a station
icon. I can download it - when addressing directly. But using LMS' image
proxy I'd always get some other image. I have no clue what's going on
there. I can't even test your problem.

[Paul Webster]

Odd.

Grabbing it with Curl shows they support http/2

< HTTP/2 200
< date: Tue, 24 May 2022 18:10:31 GMT
< content-type: image/avif
< content-length: 18196
< last-modified: Tue, 05 Apr 2022 20:04:30 GMT
< cache-control: public, max-age=31536000
< x-imgix-id: 8661d165bf29bf8b15e852aa5bd0595f9e006b2b
< age: 1709928
< access-control-allow-origin: *
< cross-origin-resource-policy: cross-origin
< x-content-type-options: nosniff
< x-served-by: cache-sjc10063-SJC, cache-ams12779-AMS
< vary: Accept, User-Agent
< x-accel-expires: @1682434998
< server: CDN77-Turbo
< x-77-nzt: Abk73hHOOij/YWcmAA
< x-77-nzt-ray: eG90Q8EDEO4
< x-cache: HIT
< x-age: 2516833
< x-77-pop: amsterdamNL
< x-77-cache: HIT
< accept-ranges: bytes

They appear to be using regional proxies - so that might account for differences in behaviour.

Also - I am using LMS 8.2.1.

Are you using gdresized or Roland's other image handler (I'm not).