You are right, mencoder uses ffmpeg. Mencoder is actually a universal interface to a number of different codecs or codec libraries like ffmpeg. So, beyond ffmpeg, mencoder can be compiled with support to x264, xvid, lame mp3 and various others that I haven’t used. The point is that if you have the correct mplayer/mencoder binary … Read more
A lot has changed since this posting in 2012. I am adding this answer for people like me who find this from the search engines. I had good luck with the following: ffmpeg -y -i source.mp4 -r 25 -s 160×90 -c:v libx264 -b:v 3M -strict -2 -movflags faststart destination.mp4 Here’s a short explanation on what … Read more
To find all the filenames use os.listdir(). Then you loop over the filenames. Like so: import os for filename in os.listdir(‘dirname’): callthecommandhere(blablahbla, filename, foo) If you prefer subprocess, use subprocess. 🙂