Hi Saeed,
Possibly, Sony PCS-1 receives unsupported resolution H.264 video from SX20(CE8.2).
You can avoid the problem with disabling H.264 on SX20.
1. Go WebUI of SX20 and proceed to Setup > Configuration.
2. Search the keyword "experimental" on top left and find "CapsetFilter" setting.
3. Put "H.264;H.264RCD0;H.264NIL" and save. No restarting SX20 is needed.
Another case, downgrading SX20 to TC7.x version works for the issue. CE8.x supports more various resolutions than before. It results interoperability issue sometime.
Regards,
Yusuke