From: Projection Journeyman The full scope of my situation can be found here:
http://superuser.com/questions/1006255/ffmpegs-dolby-pro-logic-feature-is-leaking-center-channel-into-surround-channel?noredirect=1 Including all things we have tried and why we need to do this, but just to quickly summarize: We are attempting to take a Dolby Digital .ac3 file we created from a stereo file (left = left, right = right, center = mono of left+right, LFE and surround sound are blank) and convert it to Dolby Pro Logic using ffmpeg's aresample: ffmpeg -i test-dolby-digital.ac3 -acodec libmp3lame -b:a 320k -af "aresample=matrix_encoding=dplii" test-dolby-pro-logic.mp3 The center channel of the matrixed .mp3 comes out pretty good, but it is leaking into the surround channel, even though we did not put anything at all in the surround channel of the .ac3 file. Can this be stopped? We don't see this in professionally rendered DPL soundtracks. We did notice there exists in ffmpeg aresample something called "surround_level" or "slev" that can be set to zero but aren't sure if it applies here and even if it does, how the syntax works and where it should be within the above statement. We also have our doubts it will even stop the leaking -- maybe it is a byproduct of attempting to backconvert a stereo file into digital and back to analog but matrixed? But any idea anyone can come up with to overcome this, even if it involves some software other than aresample or ffmpeg for that matter would be greatly appreciated. Projection Journeyman _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user