@rezad: I don't know if yt-dlp is also using ffmpeg but I guess so.But it won't be able to *fix* anything because if the streams are damaged in first place, then they are damaged. You are free to provide new log, maybe it contains any hints about this issue. Restart JDownloader, just download a single video and check if it contains issue.If so, please create a log, see
https://support.jdownloader.org/Know...d-session-logs and post logID here.