example in python to parse ffmpeg2theora in frontend mode:

'''
import os

cmd = "ffmpeg2theora  --frontend ..."
f_stdout, f_stdin, f = os.popen3(cmd)
info = {}
line = f.readline()
while line:
    if line.startswith('f2t'):
        for o in line.split(';')[1:]:
            oo = o.split(': ')
            if len(oo) >= 2:
                info[oo[0]] = ": ".join(oo[1:]).strip()

    #do something with info dict here

    line = f.readline()
'''