Quote:
Originally Posted by VIPimp
THANK YOU... just a quick question, if I dont run the flvtools or anything after ffmpeg, is there any downside to that as far as the quality and people being able to view it.
|
Not sure... I had some sync issues, video length reporting etc. in the past that went away once I ran the videos thru flvmdi... yeah it's a bit of a pain getting that stuff all working but if you script the conversions then it can be done all automatically for you.
re: -qscale, truth is I haven't played with all the settings a lot as I just get something decent looking and I'm happy enough since I want the surfers to sign up to a site to get the better quality videos... But after doing some reading I'm going to have to try out -qscale... it appears that if you don't use it, then the video is encoded CBR (constant bit rate) but the quality can vary frame to frame.. but by using -qscale it encodes it VBR (variable bit rate) so the quality stays constant but the bit rate changes.. Could lead to some smaller video size but I suspect you would need to cap the bitrate or set the min max... with -qscale, the values can be 1 to 31 with 1 being the best so with 3 you're almost as good as can be... what are the file sizes like?
I've seen some people post using other paramers like these ones:
-nr 500
-deinterlace
-me_range 25
-i_qfactor 0.71
-g 500
Not sure what -g is used for
someone else on here posted awhile back this stuff
-pass 1 -g 240 -qcomp 0.6 -qmax 15 -qdiff 4 -i_qfactor 0.71428572 -b_qfactor 0.76923078 -maxrate 950 -bufsize 485 -s 512x384 -b 800 -refs 1 -subq 1 -r 25 -acodec mp3 -ab 48 -ar 22050 -ac 1 -y
here's some other parameters I found...
-f flv -deinterlace -nr 500 -s 640x420 -r 30 -b 270k -me_range 25 -i_qfactor 0.9 -qmin 8 -qmax 8 -g 500 out.flv
So many things to play with... Need a degree in video compression to understand it all...