I have an mpeg with wonderful quality, but the wrong language. I have an avi with the correct language. I already extracted the audio into an ac3 format. My problem is how to get this ac3 audio into the existing video.
I tried using ffmpeg with -b 90k (mplayer reports that the bitrate is 90000) to convert to m2v so that I could use mplex with the m2v and ac3 files. This "works", sort of -- it's even in sync; however, there is a remarkable loss of quality on the video.
Is there something I'm missing? How can I multiplex just the video from an existing mpeg with another audio file?