H.264 video encoder confiduration

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Hello PJSIP-community!

In addition to my previous question (about right frame rate configuration
of ffmpeg video encoder) I want to add one more: about video quality.

Question: I want to send video in high resolution between 2 PJSIP-clients
(throw Asterisk SIP server or peer-to-peer). demand video resolution is
1680x1050, 1600x1200, 1920x1080. Frame rate is not critical (between 1 and
5 fps). for current PJSIP build (2.0 beta) I set resolution 1680x1050,
bitrate 1000, frame rate 3 fps.
But recipient (at recipient side) PJSIP client can't receive normal images.
Video has a lot of artifacts(large areas  50x50 pixels with not coded parts
of image).

How can I change ffmpeg encoder configuration to allow encode and decode
large resolutions?
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