Hello, On Tue, 01 Mar 2011, jdd wrote:
Le 01/03/2011 11:25, David Haller a écrit :
so I wonder what are the ffmpeg option I have to use? Use less compression (>= 85%) or a different image format like png or gif. JPEG is especially bad at compressing text or line art images. Don't know about ffmpeg. What did you use?
it's video, not still (the defect is on the original, not on still shot)
/usr/bin/ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0+1116,43 \\ -y /local/data/temp-data/114.mpg
That seems to default to quite a low bitrate, I get ~1500 kbps for those 480k Pixels. Remember: your average mpeg2 PAL-DVD (720x576 or 415kPixels) use e.g. 6000kbps. So, go figure ;) Testing with ffmpeg -f x11grab ... -b 6000k -y out.mpg I get about 6000kbps and the video looks _quite_ good. As a good compromise of encoding time and file size, try Divx (aka mpeg4). Testing with ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0+1116,43 \ -vcodec mpeg4 -b 2000k -y out.avi seems to work much better and uses less than 60% CPU on one core of my 3GHz Athlon II x2 250 and gives me a bitrate of about 2000k and a not so bad image. You could also try -b 2500k, -qscale 15 (or 10) or so. Or even try H.264, but that takes a lot more CPU to encode but needs half the bitrate (or even less) than mpeg4 needs. -dnh -- Nein, ich bin NICHT die Signatur, ich putz hier nur!! -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org