Hello, I an't have a good video dump of my screen. I can use recordmydesktop or ffmpeg (probably the same), but the image is far from the quality I have on screen, it seems blurred (text specially) if the two image attached go through the list server, you will see the first is mine, the second is from openqa. so I wonder what are the ffmpeg option I have to use? I have a full HD screen! Nvidia card thanks jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14
Hello, On Tue, 01 Mar 2011, jdd wrote:
if the two image attached go through the list server, you will see the first is mine, the second is from openqa.
The first (4) has the typical JPEG (over-)compression artefacts (quality <<70% I'd guess) of high contrast edges.
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? -dnh -- Dinner not ready...(A)bort (R)etry (P)izza -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
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 thanks jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14 -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
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
Le 01/03/2011 09:01, jdd a écrit :
so I wonder what are the ffmpeg option I have to use?
I also tried xvidcap, but it continuously crashes :-( I will probably revert to camcorder... defects are more acceptable jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14 -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
Le 01/03/2011 09:01, jdd a écrit :
so I wonder what are the ffmpeg option I have to use?
found -target pal-dvd makes the result much better :-) jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14 -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
On 03/01/2011 03:43 PM, jdd wrote:
Le 01/03/2011 09:01, jdd a écrit :
so I wonder what are the ffmpeg option I have to use?
found
-target pal-dvd
makes the result much better :-) jdd
You can still specify -vcodec <ffmpeg -codecs for list> to reduce the file size, the dvd option gives a good bitrate and quality but an mpeg4 codec will reduce the file size considerably. Dave P -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
Le 01/03/2011 14:43, jdd a écrit :
makes the result much better :-)
the results http://dodin.org/wiki/index.php?n=Doc.VideoScreenCapture notice that usual options like -b did not make any good. Target is much better. still the result in 1024x768 is not as good as I would like, but dvd do not allow that much an I don't want to make too big a video, anyway it's mostly done to be spread through Youtube and alike jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14 -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
On Mar 01, 11 16:02:36 +0100, jdd wrote:
Le 01/03/2011 14:43, jdd a écrit :
makes the result much better :-)
the results
http://dodin.org/wiki/index.php?n=Doc.VideoScreenCapture
notice that usual options like -b did not make any good.
ffmpeg -f x11grab -s 800x600 -r 25 -i :0.0+4,29 -b 8888k tree48.mpg works well for me. Note the k!
still the result in 1024x768 is not as good as I would like, but dvd do not allow that much...
no target pal-dvd, no such limitation :-) I start running into the limits of my poor CPU now, while encoding.... cheers, JW- -- o \ Juergen Weigert paint it green! __/ _=======.=======_ <V> | jw@suse.de back to ascii! __/ _---|____________\/ \ | 0911 74053-508 __/ (____/ /\ (/) | _____________________________/ _/ \_ vim:set sw=2 wm=8 SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg) SuSE. Supporting Linux since 1992. -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
Le 01/03/2011 18:25, Juergen Weigert a écrit :
I start running into the limits of my poor CPU now, while encoding....
I buy an i5 to overcome this. really usefull for any HD work :-) but for the internet, not really necessary :-) jdd -- http://www.dodin.net http://www.dailymotion.com/video/xgxog7_clip-l-ombre-et-la-lumiere-3-bad-pig... http://www.youtube.com/watch?v=FGgv_ZFtV14 -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
On 03/01/2011 10:01 AM, jdd wrote:
Hello,
I an't have a good video dump of my screen. I can use recordmydesktop or ffmpeg (probably the same), but the image is far from the quality I have on screen, it seems blurred (text specially)
if the two image attached go through the list server, you will see the first is mine, the second is from openqa.
so I wonder what are the ffmpeg option I have to use?
I have a full HD screen! Nvidia card
thanks jdd
Ffmpeg has a lot of filters and also defaults to low bitrates, what command line string did you use? Dave P -- To unsubscribe, e-mail: opensuse-multimedia+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-multimedia+help@opensuse.org
participants (4)
-
Dave Plater -
David Haller -
jdd -
Juergen Weigert