[FFmpeg-user] Using amerge to convert dual mono to stereo

[Tim Nicholson]

I am trying to use the amerge filter to convert dual mono to stereo, but 
get a warning from amerge:-

"[amerge @ 0x1933a80] Inputs overlap: output layout will be meaningless"

and sure enough what I get is stream 1 on both channels of the stereo 
output with no stream 2 at all....

Clément Nicolas et al, any ideas....

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ffmpeg -i glitz4-HD.mov -f lavfi -i "amovie=glitz4-HD.mov:si=1 [a1]; 
amovie=glitz4-HD.mov:si=2 [a2]; [a1][a2] amerge" -vf "yadif=0:-1:0, 
scale=832:468 [scaled]; movie=logo_16x9-50.png [logo]; [scaled][logo] 
overlay=8:5" -c:v libx264 -pix_fmt yuv420p -b:v 1404k -r 25 -maxrate 
1404k -bufsize 5097k -c:a libfaac -b:a 96k -ar 48000 -ac 2 -y 
glitz4-HD-50.mp4
ffmpeg version N-36728-g794006f-by_Tim Copyright (c) 2000-2012 the 
FFmpeg developers
   built on Jan 12 2012 11:45:18 with gcc 4.6.2
   configuration: --extra-version=by_Tim --enable-static 
--disable-shared --enable-gpl --enable-nonfree --enable-version3 
--prefix=/mnt/msds-store-0/tim/ffmpeg-tux/usr/local 
--libdir=/mnt/msds-store-0/tim/ffmpeg-tux/usr/local/lib64 
--enable-runtime-cpudetect --extra-cflags='-static 
-I/mnt/msds-store-0/tim/ffmpeg-tux/usr/local/include' 
--extra-ldflags='-static 
-L/mnt/msds-store-0/tim/ffmpeg-tux/usr/local/lib64' 
--progs-suffix=static --enable-libfaac --enable-libx264 --enable-libfreetype
   libavutil      51. 34.100 / 51. 34.100
   libavcodec     53. 55.100 / 53. 55.100
   libavformat    53. 29.100 / 53. 29.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 58.100 /  2. 58.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  6.100 /  0.  6.100
   libpostproc    51.  2.100 / 51.  2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'glitz4-HD.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2011-12-20 10:15:06
   Duration: 00:00:30.00, start: 0.000000, bitrate: 834065 kb/s
     Stream #0:0(eng): Video: rawvideo (2vuy / 0x79757632), uyvy422, 
1920x1080, 829440 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
     Metadata:
       creation_time   : 2011-12-20 10:15:06
       handler_name    : ?Apple Alias Data Handler
     Stream #0:1(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 
channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2011-12-20 10:15:06
       handler_name    : ?Apple Alias Data Handler
     Stream #0:2(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 
channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2011-12-20 10:15:06
       handler_name    : ?Apple Alias Data Handler
     Stream #0:3(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 
channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2011-12-20 10:15:06
       handler_name    : ?Apple Alias Data Handler
     Stream #0:4(eng): Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 1 
channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2011-12-20 10:15:06
       handler_name    : ?Apple Alias Data Handler
     Stream #0:5(eng): Data: none (tmcd / 0x64636D74)
     Metadata:
       creation_time   : 2011-12-20 10:17:46
       handler_name    : ?Apple Alias Data Handler
       timecode        : 01:00:00:00
[amovie @ 0x17c6e40] seek_point:0 format_name:(null) 
file_name:glitz4-HD.mov stream_index:1
[amovie @ 0x17961c0] seek_point:0 format_name:(null) 
file_name:glitz4-HD.mov stream_index:2
[amerge @ 0x1933a80] Inputs overlap: output layout will be meaningless
[abuffersink @ 0x188eda0] auto-inserting filter 'auto-inserted aconvert 
0' between the filter 'Parsed_amerge_2' and the filter 'out' 

[amerge @ 0x1933a80] in1:mono + in2:mono -> out:stereo

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-- 
Tim


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