Super small for blurry videos

ffmpeg -i /root/source.mp4 -an -c copy -map 0 -movflags +faststart -vcodec h264 -b:v 1000k -acodec mp2 target.mp4

For drone videos better use:

ffmpeg -i /root/source.mp4 -an -c copy -map 0 -movflags +faststart -vcodec h264 -b:v 3000k -acodec mp2 target.mp4

If you don't have ffmpeg you can also upload your video to:

https://www.ps2pdf.com/compress-mp4

More info:

https://blog.dareboost.com/en/2018/01/optimize-your-mp4-video-for-better-performance/