I had some problems screencasting my desktop, i used the freeware from Copernicus … works great but is using the cpu on my 2.16 completely, i have two g of ram and the option: record into ram dosen’t work at all and i can’t record audio ;( i use the mpeg4 output type with h264. this output file is not convertable with ffmpeg: “no media or nothing found”.
Now I use Screen Mimic which is good but uses strange flv output formats … the mov output is good and
fast. Now i am converting those mov videos with ffmpeg like this:
ffmpeg -i somemov.mov -sameq -g 500 someflash.flv
I had the best quality experience with the -sameq option and setting the group of picture size to like 500 gave me additional “compression” 
i think the -b video bitrate option is not needed anymore because of -sameq. I had a 26second video screening my surfing on lots of webpages with many images. the mov file was 50mb and the resolution was 1280×800. after converting the quality stayed the SAME and the file was only 6mb big!!!!
history:
I also tried Quicktime Pro -> didn’t work somehow
somehow copernicus speeded up the video by 300% but this was solvable with premiere which gave me horrible output quality, after effects then did the job ok but really really really slow
please help me… i want to convert a video which is in quicktime to flv with ffmpeg – the reason for this is because i would like to upload it onto youtube and youtube doesnt convert(touch the quality) your video if it has ffmpeg.. i dont really know how to code but would really like to know how to do this… please can you help me
))
Thanks
you have to open your console and type:
ffmpeg -version
if this checks out ok than run the command:
ffmpeg -i input.mov -sameq -g 500 output.flv
if the output sais: something is missing than just provide it. put the error message to google and check for mailinglist. i say this because sometimes the framerate or audio sampling rate (44100) is missing and needs to be provided as ffmpeg arguments.
but i doubt that youtube doesn’t “compress” the video. ffmpeg is a tool for video and audio (converting to different formats, scaling, thumbs, … the list is not ending).
the most simple ffmpeg usage is:
ffmpeg -i input.mov output.flv
check for some graphicals tools if that fits your knowledge about fmpeg better. search for “ffmpeg gui” in google.
lg:nils