[FFmpeg-user] Need help with video filter to create multiple ouput

[kslimani at diffusepro.com]

Hello,

i am trying to transcode a live UDP stream into 4 rtmp output stream using
a single ffmpeg process but my command line display this error : "At least
one output file must be specified".

The command i am using is :

ffmpeg -i udp://224.0.0.1:1234 \
-vf
"crop=iw-5:ih-5:5:5,yadif,split=2[out0][out1];[out0]scale=1280:720,split=2[src0][src1];[out1]scale=848:480,split=2[src2][src3]"
\
-map "[src0]" -aspect 16:9 -r 25 -vb 2500k -vcodec libx264 -vprofile
baseline -g 50 -acodec libfdk_aac -ac 2 -ar 48000 -ab 128k -async 1 -f flv
rtmp://192.168.1.1/live/test_2500 \
-map "[src1]" -aspect 16:9 -r 25 -vb 1500k -vcodec libx264 -vprofile
baseline -g 50 -acodec libfdk_aac -ac 2 -ar 48000 -ab 128k -async 1 -f flv
rtmp://192.168.1.1/live/test_1500 \
-map "[src2]" -aspect 16:9 -r 25 -vb 700k -vcodec libx264 -vprofile
baseline -g 50 -acodec libfdk_aac -ac 2 -ar 48000 -ab 128k -async 1 -f flv
rtmp://192.168.1.1/live/test_800 \
-map "[src3]" -aspect 16:9 -r 25 -vb 250k -vcodec libx264 -vprofile
baseline -g 50 -acodec libfdk_aac -ac 1 -ar 48000 -ab 48k -async 1 -f flv
rtmp://192.168.1.1/live/test_300

Basically, i am trying to use video filters to crop & deinterlace the
input only once, then split in 2, scale into 2 different resolution and
again split each resolution in 2 and finally use -map option to encode
each filter output.

My FFmpeg version is compiled today from git sources :

ffmpeg version git-2014-07-21-4927c0a Copyright (c) 2000-2014 the FFmpeg
developers
  built on Jul 21 2014 15:44:04 with gcc 4.7 (Debian 4.7.2-5)
  configuration: --enable-x11grab --enable-gpl --enable-libfaac
--enable-libfdk-aac --enable-libopus --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264
--enable-nonfree --enable-version3 --enable-avresample
  libavutil      52. 92.101 / 52. 92.101
  libavcodec     55. 69.100 / 55. 69.100
  libavformat    55. 48.101 / 55. 48.101
  libavdevice    55. 13.102 / 55. 13.102
  libavfilter     4. 11.102 /  4. 11.102
  libavresample   1.  3.  0 /  1.  3.  0
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100

Does someone see which could be the reason it does not work ?

Thank you for help.