Tutorials
Hints for FFMpeg
1) Drop the audio-channel without losing quality:
ffmpeg -i <infile.mp4> -c copy -an <outfile.mp4>
2) Downsize a grayscale video to 720p@20fps with a bitrate of 500k:
ffmpeg <infile.mp4> -s hd720 -r 20 -filter:v “hue=s=0” -b:v 500k <outfile.mp4>