These are completely different systems, with different principles of working with media content, they do not need to be compared.
Sure I didn't want to compare both systems, I just wanted to say, that it was not a faulty file(as it works on other builds of LE and armbian without issues). Accidently I overwrote this specific version. On newer builds the problem dissappeared and file plays as it should. Maybe I was the error, it was a strange moon phase or elsewhat...everything fine with local files now for me.
Thank you for all your good and hard work!