1. Adobe Media Server 5 (not Flash Media Server 5)
2. I assume you are using SMP (OSMF) – when you stream FLV content, no need for .flv extension, so your path should be rtmp://204.61.223.xxx/vod/aaa/sample, not rtmp://204.61.223.xxx/vod/aaa/sample.flv. For mp4/f4v content, use this - rtmp://204.61.223.xxx/vod/mp4:/aaa/sample1_1500kbps.f4v.