Black screen for RTSP H.264 to H263 encoding

[buro1983]

Hello, i've two queries

1) i'm trying to encode rtsp video feed which is having h.264 codec, into
h.263.

gst-launch-1.0 -v rtspsrc location="rtsp://source" ! capsfilter
caps="application/x-rtp,media=(string)video,payload=(int)97,clock-rate=(int)90000,encoding-name=(string)H264"
! rtph264depay ! avdec_h264 ! videoscale ! videorate skip-to-first=true !
videoconvert ! queue ! capsfilter
caps="video/x-raw,format=(string)I420,width=(int)352,height=(int)288,framerate=(fraction)15/1,colorimetry=(string)bt601"
! avenc_h263p rtp-payload-size=10 ! rtph263ppay pt=96 ! udpsink
clients="IP:Port"

But i'm getting black screen while testing through vlc player. If any object
in that video starts moving then only i'm getting visual of that particular
object and remaining screen is black. I'm not able to figure out the issue.

2) Few mobile handset is able to play QCIF but not CIF and few can play
both. What encoding format will be good if I want to play my live video feed
on all mobile handset.




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