[Asterisk-video] error with app_transcoding

[Mário Dias]

Hello! I just installed the app_transcoder with success and this runs
well with asterisk boot...

Now the problem is:

My extensions.conf:

[default]

exten=5001,1,Answer()
exten=5001,n,Transcode(,s at camera,h263 at qcif/fps=10/kb=52/qmin=4/qmax=12/gs=50)
exten=5001,n,Hangup()

[camera]

exten=s,1,Answer()
exten=s,n,Rtsp(rtsp://192.168.10.14:8554/CH001.sdp)
exten=s,n,Hangup()


And when I call 5001, the asterisk "craches" and in asterisk logs show
the folow information:

[Feb 23 18:15:22] WARNING[4142] app_transcoder.c: >Transcoding
[,s at camera,h263 at qcif/fps=10/kb=52/qmin=4/qmax=12/gs=50,80008]
[Feb 23 18:15:22] ERROR[4142] app_transcoder.c: Error opening encoder
[Feb 23 18:15:22] WARNING[4142] app_transcoder.c: -joining thread

I receive rtsp streaming with mp4v video codec, and I want transcode
to H263 codec to softphone, the X-lite4.

Any ideas???
Help me please!!!!

Best regards,

Mário Dias