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
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