MP4 video files running on consoles

I download videos onto my pc either in MP4 or avi format and connect my PS4 & Xbox up via media share so that I can't stream the videos across to the consoles. Sometimes use a USB stick.

Does anyone know why some videos can't be skipped forwards or backwards while some vids are ok. It's confusing because they are all MP4 files. Normally this may happens when using different files types or codecs.

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