Thumbnailing within VLC does not preserve the aspect ratio
When creating thumbnails, the resulting file will always have the aspect ratio 1:1.6. Media with a different AR will be thumbnailed in a distorted way.
See the attached sample for reference. Source stream available on request.
![100-fixed-AR](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
![100-actual-result](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)