ffmpeg shrink file

I got some mts files that has not been uploaded for a long time, and got some time today to do that.  Windows Movie Maker is nice but one by one upload is just too slow.

Did some research, so finally find a way to do it in batch:

1.  loop all files do:  ffmpeg -i input.mts -fv scale=720:-1 output.mp4

2. drop all the mp4 to youtube :)