On 7/2/15, Christoph Gerstbauer <[email protected]> wrote: >> Then please don't use it, use an audiofilter instead. >> (The one that fits your needs.) >> >> I am not convinced that the current mapping of -ac >> to aresample is immutable. >> (Even if it is, you can still use the filter and >> you are on the safe side.) >> >> Carl Eugen > > 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. > > If I have a target with less channels than the source I use the > -map_channel option: > Like: ffmpeg -i "24bitaudio8CH.wav" -acodec pcm_s16le -map_channel 0.1.0 > -map_channel 0.1.1 -ac 2 "16bitaudio2CH_ch1ch2.wav" > > So is this possible?: > ffmpeg -i "2ch_audio_source.wav" -i "mono-silence" -acodec pcm_s16le > -map_channel 0.1.0 -map_channel 0.1.1 -map_channel 1.0.0 -map_channel > 1.0.0 "4ch_audio_target.wav" > Is there a filter which can generate silence as input source?
See anullsrc and aevalsrc. > > Best Regards > Christoph > > > _______________________________________________ > 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
