You cannot use 'itsoffset' to delay an audio stream, you need 'adelay' audiofilter instead.
Eg. [1:0]adelay=10|10[out1] to produce a 10 second delayed audio from stream 1:0 and call it out1 So your case could be: ffmpeg -y -i 20150416203941.broadcast.ts -i 20150416203941.broadcast.ts -filter_complex "[0:1]adelay=10|10[track1];[track1][1:2]amix[mixout]" -c:v copy -c:a aac -b:a 128k -ar 44100 -strict -2 -map 0:0 -map [mixout] -f flv test1.flv Note that 10 second delay is specified twice – separately for left and right channels Суббота, 18 апреля 2015, 9:38 +02:00 от Thomas Seilund <t...@netmaster.dk>: >Hi all > >I have an mpegts container with one video and two audio streams. > >I what to mix the two audio streams. At the same time the second audio >stream must be delayed 10 seconds to match the first audio stream. > >Here is what I have as input > >tps@t420:~/video/test$ ffprobe -i 20150416203941.broadcast.ts >ffprobe version N-69238-g2699a37 Copyright (c) 2007-2015 the FFmpeg >developers > built on Feb 24 2015 18:13:15 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) > configuration: --enable-gpl --enable-libmp3lame --enable-libvpx --enable- >libx264 --enable-version3 --enable-libvorbis --enable-libfreetype --enable- >libv4l2 --enable-libfdk-aac --enable-nonfree --enable-libpulse > libavutil 54. 17.100 / 54. 17.100 > libavcodec 56. 20.100 / 56. 20.100 > libavformat 56. 19.100 / 56. 19.100 > libavdevice 56. 4.100 / 56. 4.100 > libavfilter 5. 8.101 / 5. 8.101 > libswscale 3. 1.101 / 3. 1.101 > libswresample 1. 1.100 / 1. 1.100 > libpostproc 53. 3.100 / 53. 3.100 >Input #0, mpegts, from '20150416203941.broadcast.ts': > Duration: 00:00:18.69, start: 1.400000, bitrate: 4186 kb/s > Program 1 > Metadata: > service_name : Service01 > service_provider: FFmpeg > Stream #0:0[0x100]: Video: h264 (Constrained Baseline) ([27][0][0][0] / >0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 >tbc > Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, >stereo, s16p, 384 kb/s > Stream #0:2[0x102]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, >stereo, s16p, 384 kb/s >tps@t420:~/video/test$ > > > >Here is what I do > >ffmpeg -y -i 20150416203941.broadcast.ts -itsoffset 10 -i >20150416203941.broadcast.ts -filter_complex "[0:1][1:2]amix[mixout]" -c:v >copy -c:a aac -b:a 128k -ar 44100 -strict -2 -map 0:0 -map [mixout] -f flv >test1.flv > > > >The two audio streams are mixed ok but the timestamps of the second audio >stream are not shifted 10 seconds. > > > >Actually, the following command without the -itsoffset 10 parameter >produces the same output > >ffmpeg -y -i 20150416203941.broadcast.ts -i 20150416203941.broadcast.ts - >filter_complex "[0:1][1:2]amix[mixout]" -c:v copy -c:a aac -b:a 128k -ar >44100 -strict -2 -map 0:0 -map [mixout] -f flv test2.flv > > > >What am I doing wrong? > >Any help would be appreciated. > >Thanks > >Thomas S >_______________________________________________ >ffmpeg-user mailing list >ffmpeg-user@ffmpeg.org >http://ffmpeg.org/mailman/listinfo/ffmpeg-user Sincerely, -- Denis Mysenko, CCNA, MCP, MCSA Skype: denismysenko, ICQ: 555955 Forskarbacken 9 / 209 10405 Stockholm, Sweden Mobile: +46 (0) 70 405 49 04 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user