Hi mesecam First thing to say is sorry for braking the thread, but I have just signed up to the list. So i can not directly reply to your mail. You claim to have performed a two-pass encoding, but from the command line you give, i can just see you performing a first pass: ffmpeg2theora -x 720 -y 400 -V 1075 --noaudio --aspect 16:9 -K 240 --optimize --soft-target --first-pass theora2pass.log -o test.ogv my_file.avi Did you run a second pass using '--second-pass theora2pass.log', too? Did you try to run both passes in one go using the parameter '--two-pass'? ffmpeg2theora -x 720 -y 400 -V 1075 --noaudio --aspect 16:9 -K 240 --optimize --soft-target --two-pass -o twopass.ogv my_file.avi Yours Stefan