Compiling
This document explains how to install and setup the app_transcoder application.
First, you need to have the source code of your Asterisk correctly installed on your system and the development libraries from the ffmpeg project.
Copy the app_transcoder.c file into de Asterisk apps directory and append the following lines to the Makefile in the same directory:
app_transcoder.so : app_transcoder.o
$(CC) $(SOLINK) -o $@ ${CYGSOLINK} $< ${CYGSOLIB} -lavcodec
Depending on the version you are using could have add the include directory and change the #include of the avcodec.h to match yours.
Goto the Asterisk parent directory and
make
make install
Setup
Enable video support and preferred codecs in sip.conf
videosupport=yes
disable=all
allow=ulaw
allow=alaw
allow=h263
allow=h263p
Now, you can use the application functions in your dialpan, a setup example with integraton with appr_rtsp could be:
[default]
exten => 201,1,Answer
exten => 201,2,transcode(,s@camera,h263@qcif/fps=10/kb=52/qmin=4/qmax=12/gs=50)
exten => 201,3,HangUp
[camera]
exten => s,1,Answer
exten => s,2,rtsp(http://192.168.1.2/live.sdp)
exten => s,3,HangUp
Calling 201 will create a new channel placed in the camera context, it will transcode the incoming MPEG4-ES into an H263 encoded one with the specified parameters.
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app_transcoder 
