[MEncoder-users] How to encode flvs with the highest visual quality possible for Internet Sharing

[alejandro Velez Palacio]

I do encode to flash video before uploading videos to some sharing websites 
like youtube or blip.tv using the following settings:

mencoder -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames 
input.avi -o output.flv -of lavf -ovc lavc -oac lavc -lavcopts 
vcodec=flv:vbitrate=200:autoaspect:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2:precmp=2:cmp=2:subcmp=2:preme=2:turbo

but ever the resulting flv had more noticeable blocky artifacts compared 
with another videos in reencoded by youtube and now it seems sometimes that 
the quality degrades with the pass of the playback time with all flvs 
produced using mencoder, there are more settings that can I use to make to 
reduce the resulting artifacts or make the quality better if possible? the 
source and destination material is ever rated at 30 fps and sized at 320x240

Here are some examples

One of the first videos that I encoded with Mencoder 
http://www.youtube.com/watch?v=_qGRfuZVZy0

Here the video has less quality than the other above and it gets even worst 
around 02:20 http://www.youtube.com/watch?v=pJjo7r7gQ-w

Then lets look at this examples encoded by youtube

http://www.youtube.com/watch?v=w5Ht1WzeWv0
http://www.youtube.com/watch?v=KVp6DHPDtHo

I didn't find noticeable artifacts in these examples compared with the 
samples that I complain about

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