@rezad: unfortunately I'm unable to reproduce the issue and there have been no changes from our side. also if it was a JDownloader error it would affect all user and also happen again when you download again the same file.
Please test your system memory with memtest86. also try to download to different drive.Also you should check/try a different ffmpeg version as you're using a different one than the one JDownloader does install
Quote:
I get these messages:
[libdav1d @ 0x562ccf11b640] Unknown OBU type 0 of size 4
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Also please know that the error seems to happen with av1 codec, so maybe in the past you've downloaded vp9 coded streams.