Recorded video stream with h264 video codec is Blocky/Blurry

In my application I am using H.264 with setting h264Settings.setProfileLevel(H264Profile.BASELINE, H264Level.LEVEL_1); and  record stream in f4v format

publish("mp4:"+streamName+".f4v", "record");

Now In the live session stream in fine at receiver end but When I watch recorded file Its quality was very poor. It looks very Blocky and blurry. I am using Flash Media Server 3.5.7

Anyone having solution  then please let me know.