Right, FM mono (since FM stereo came out) is L+R, then if you can manage stereo reception the second channel is L-R. I set up a car stereo once with 8 switches, you could switch each (of 4) speakers from left to right, you could also flip the phase of each. Interesting experiment but I quickly found my favorite and left it that way. Something like front LR but rear RL I think.
MPEG 1.0 L III vbr 44100 stereo mpg123 no longer says joint stereo, so I'll change my batch scripts and re-run my conversions. I just listened to a fixed piano piece (with headphones) that must have had 2 mics on the piano, one at the bass end and one at the treble. Classical, think 2 mics in an open grand piano. Thank you. On 4/18/21, Moritz Barsnick <barsn...@gmx.net> wrote: > 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". > -- ------------- Education is contagious. _______________________________________________ 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".
