Desktop misdetects a WebM audio file as a video file and shows it accordingly

[farooqkz]

• Operating System (Linux/Mac/Windows/iOS/Android): Linux(Debian)

• Delta Chat Version: 1.46.1 (git: v1.33.0-911-g2c356eb0-img-cropper-controls)

• Expected behavior: The webm audio file should be shown with audio controls and without video

• Actual behavior: The webm audio attachment is shown as video by showing a black scren

• Steps to reproduce the problem: Simply send or receive a webm audio file

• Screenshots:
  

• Logs:

[farooqkz]

Also in Gallery, it gets classified as Video not Audio.

[r10s]

webm is a container format and surely can be audio-only, maybe even images, stickers (although there is webp) or whatnot

however, core does not inspect file contents - that would be too much effort for all these formats nowadays - but mainly relies on extension (maybe mime types) - and does a best guess, based on real-world usage.

in case of .webm, this is video. where do the audio-only files come from? maybe they have another extension? if that is a at-scale real-world problem, we can think over :)

[farooqkz]

The thing is that WebM has two mime types according to Wikipedia: audio/webm and video/webm. I really don't know if there is real world usage for Audio webm or not. I don't generally use this format so I don't know. But I happen to have a webm audio file downloaded from invidious.

[meganoahj]

if you rename your webm audios to .opus it works correctly.