I have also noticed the playback quality difference between ffmpeg and e.g. 
adobe's flash player for flv videos.
My comparisons are done on Mac OS X, but the issue is clearly in video 
decompression, so platform shouldn't matter.

To reproduce:
- go to a site with flv media, like http://svtplay.se/
- select a show, play it in the embedded flash player and notice the quality.
- download the same program (using rtmpdump) and watch it in mplayer. 

Example:
- flash: http://svtplay.se/t/103535/uppdrag_granskning
- external: 
rtmp://fl11.c90901.cdn.qbrick.com/90901/_definst_/kluster/20090408/UG_090408

At first I thought it might have to do with differences in how the flash
player and rtmpdump fetches the rtmp stream, like the official player
getting better quality. But playing the downloaded file in the Adobe
flash tools (creating a swf file to play the flv file) got me the same
quality seen in the online player.

I have tried different versions of mplayer, but the result is the same. (for 
example: mplayer dev-SVN-r27545-4.0.1)
VLC shows the same blocky artifacts as mplayer.

-- 
Bad quality in FLV playback
https://bugs.launchpad.net/bugs/197842
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