On Sat, Apr 17, 2021 at 13:42:02 -0400, Alan Corey wrote: > can deal with. So I did the basic > ffmpeg -i somefile.wma somefile.mp3 > And it works, but mpg123 tells me the file is joint stereo. It's > quite possible the wma files are joint stereo, I don't know anything > about them, but when I convert a flac file (to wav then mp3) I can at > least nominally output true stereo.
ffmpeg's encoder is independent of the input, joint stereo is its default. > accomplish anything but I call LAME with -m s. Is that possible with > ffmpeg? How? Do I need to get into channel mapping? As Paul wrote: -joint_stereo 0 (as output option). > Joint stereo I remember from the early days of fm stereo that had to > also be playable on mono radios. Better than mono but not as good as > true stereo. It depends on the quality of the encoder, but basically, joint stereo means that the encoder makes use of the similarity of the two channels to optimize bandwidth use. At the same (fixed) bitrate, you may encouter better quality in critical sections. With modern encoders (such as mp3lame), you shouldn't notice a difference in your stereo separation. In other words: Just continue to use joint stereo if you can. See also https://wiki.hydrogenaud.io/index.php?title=Joint_stereo#Additional_information Cheers, Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
