Ffmpeg - low fps when i record my desktop;

Hello. When i am running ffmpeg on 1280x768 resolution, program record with ~100fps, When i change resolution to my native(1366x768), program record with ~29 fps and system running slow.
Record with 1280x768
frame= 66 fps=0.0 q=17.0 size= 417kB time=00:00:00.30 bitrate=11374.4kbitsframe= 132 fps=131 q=17.0 size= 449kB time=00:00:00.63 bitrate=5832.5kbits/frame= 199 fps=132 q=17.0 size= 449kB time=00:00:00.96 bitrate=3807.7kbits/frame= 256 fps=127 q=24.0 size= 481kB time=00:00:01.25 bitrate=3149.3kbits/frame= 321 fps=128 q=17.0 size= 769kB time=00:00:01.57 bitrate=4000.0kbits/
Record with 1366x768
frame= 18 fps=0.0 q=18.0 size= 390kB time=00:00:00.06 bitrate=53303.6kbitsframe= 33 fps= 32 q=17.0 size= 443kB time=00:00:00.13 bitrate=26879.3kbitsframe= 48 fps= 31 q=17.0 size= 465kB time=00:00:00.21 bitrate=18156.8kbitsframe= 63 fps= 31 q=17.0 size= 482kB time=00:00:00.28 bitrate=13841.4kbitsframe= 78 fps= 30 q=18.0 size= 502kB time=00:00:00.36 bitrate=11420.9kbitsframe= 93 fps= 30 q=18.0 size= 516kB time=00:00:00.43 bitrate=9708.7kbits/
ffmpeg commend
ffmpeg -f x11grab -r 100 -s 1366x768 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 5 arch.mkv
sysinfo
Linux adrian 3.8.3-2-ARCH #1 SMP PREEMPT Sun Mar 17 13:04:22 CET 2013 x86_64 GNU/Linux
hardware info:
i5 8gb ram 630m
Do u know how to get better fps on my native resolution?
THX
Dziękuje i Pozdrawiam:}
Last edited by Vatri91 (2013-03-23 11:30:29)

Couple of thoughts.
30 fps is DVD quality. I would drop (-r 100) to (-r 24) I don't know what you are gaining capturing at 100fps.
You can also dump to raw video then encode the file later.
You can lower the video bitrate that you encode to (c:v libx264 -b:v 500k). Depends on how active your screen is. If you are just doing a tutorial of something then you may be able to drop down to (300k). Anything under (1000k) will be noticeable if you have a lot of movement on the screen.
This example gives a smooth full screen capture (without sound) (On an AMDx2)
ffmpeg -f x11grab -r 24 -s 1920x1080 -i :0.0 -an -c:v libx264 -b:v 500k output.mpg
This is easier on the CPU
ffmpeg -f x11grab -r 24 -s 1920x1080 -i :0.0 -an -c:v libx264 -crf 0 -preset ultrafast output.mpg
Another example using -qscale
ffmpeg -f x11grab -r 24 -s 1920x1080 -i :0.0 -an -c:v libx264 -qscale 10 output.mpg
For a raw video
ffmpeg -f x11grab -r 24 -s 1920x1080 -i :0.0 -an -f rawvideo output.raw
You have a raw video now so to play it, or take it and encode it.
mplayer -demuxer rawvideo -rawvideo w=1920:h=1080:y8 output.mpg
If framerate is dropping below specified while capturing with ffmpeg then, you'll have to lower the bitrate that you are encoding at, dump the stream as a raw video then encode it later, capture a smaller area of screen, or I hear that recordmydesktop does well.
EDIT: reason for edit, syntax correction.
Last edited by teckk (2013-03-27 14:57:33)

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