> -----Original Message----- > From: [email protected] [mailto:ffmpeg-user- > [email protected]] On Behalf Of Christoph Gerstbauer > Sent: 03 July 2015 08:36 > To: FFmpeg user questions > Subject: Re: [FFmpeg-user] Need more detailed description of the behaviour > of the "-ac <channelcount>" option > > > > Am 02.07.15 um 12:49 schrieb Nicolas George: > > Le quartidi 14 messidor, an CCXXIII, Christoph Gerstbauer a écrit : > >> Hello Carl, so what can I do when my target has more audio channel > >> than the source? > >> For example if I have a file with 2ch stereo and my target is 4ch > >> (with ch3 and ch4 silent) how can i do that? I need to generate > >> silence for the last 2 channels because I dont want to copy ch1ch2 to > ch3ch4. > Hi Nicolas! > > I tried the pan filter, it works very well when using ONE audio source stream. > For example I use this syntax to spread 2ch source to 8ch target: > > -af "pan=8c|c0=c0|c1=c1|c2=c0|c3=c1|c4=c0|c5=c1|c6=c0|c7=c1" > > But what can I do when I want this? > c1=c1 > c2=c2 > c3=silent > c4=silent > c5=silent > c6=silent > c7=silent > c8=silent > > I tried to use the anullsrc (to generate silence), but to use that anullsrc would > be a second audio input stream.
Although I haven't tried it in this context, I suspect the '-map' option should enable you to specify treatment for individual input streams. > But how can I defind a second audio input stream in pan? I think this is not > possible. In the examples there is no hint for that. > > Am I right? > > mfg chris > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
