If you've got a #PowKiddy #v90 (with the #MiyooCFW firmware) or #Anbernic device, you might find that you can get more movies/shows on a card and have them play smoother with this oneline #bash script (just an ffmpeg command that uses $1 as a filename:
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#!/bin/bash

ffmpeg -y -i "$1" -r 20 -s 352x288 -vb 400k -acodec aac -strict experimental -ac 1 -ar 8000 -ab 24k "$1.3gp"

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It'll make a 3gp video file with a lower bitrate and resolution. Fine for tiny screens