Hello,
It seems that all movies on my SMP have problems with fluent play. It looks like image stops for a split second every half second or so. Audio is OK. It is specially promiment in case of panning scenes or similar motion.
The same file plays fluently when played directly by my smart TV. SMP is connected to the TV via amp (HDMI). Latest firmware installed. Movies are played from USB Desktop Elements drive connected directly to the SMP.
Here is a 4.5 MB sample, where stuttering is very visible https://www.mediafire.com/?jyuh3vj41eaclc8
Do you see it as well?