ffmpeg quadruple video and audio play speed
The audio filters should be chained one after the another. Your syntax generates two audio tracks, each doubled in speed. Also, since you're dealing with one input and one output, you can just use simple filters.

ffmpeg -i 02.mp4 -vf "setpts=0.25*PTS" -af "atempo=2.0,atempo=2.0" 02ff.mp4