Convert *.mp4 to twitter supported video format.

convert.sh

# Thnak you @nik hanselmann
# When you use facebook video downloader like https://www.getfvid.com/，
# You may get a mp4 video that can;t uploaded to twitter (Perhaps codec problems?)
# Or others online converter will give you a video with broken sound channel (audio turns into noises)
# So, what we can do is convert the video source again ot correct format/ codec (libx264).
# You can use the command below:

ffmpeg -i test.mov -vcodec libx264 -vf 'scale=640:trunc(ow/a/2)*2' -acodec aac -vb 1024k -minrate 1024k -maxrate 1024k -bufsize 1024k -ar 44100 -strict experimental -r 30 out.mp4

twtconv

#!/bin/bash
for i in *.mp4;
        do name=`echo "$i" | cut -d'.' -f1`
        echo "$name"
        ffmpeg -i "$i" -vcodec libx264 -vf 'scale=640:trunc(ow/a/2)*2' -acodec aac -vb 1024k -minrate 1024k -maxrate 1024k -bufsize 1024k -ar 44100 -strict experimental -r 30 "$name"-output.mp4
done