[FFmpeg-user] fast video codec for screen casting

[dE .]

On 01/06/12 00:52, Carl Eugen Hoyos wrote:
> dE .<de.techno<at>  gmail.com>  writes:
>
>> Using -f null I get full performance (upto 100 FPS) till I set -r 100
>> for the input.
> Right, I forgot that 30 is default (iiuc)
>
>> Above 100 I only get 3 or 4 FPS. So everything is good
>> with -f null.
>>
>> I think I did post the output -
>>
>> ffmpeg -f alsa -i default -f x11grab -s 1280x800 -i :0.0 -threads 1
>> -qscale 2 -threads 1 -b 20000k -vcodec mpeg1video -ar 44100 -ac 2.0
>> -acodec pcm_s16le out.avi
> Sure, but the command for which output (or info about fps) is needed is:
> ffmpeg -f x11grab -s 1280x800 -i :0.0 -f null -qscale 2 -threads 1 -vcodec
> mpeg1video -
>
> Carl Eugen

ffmpeg -f x11grab -s 1280x800 -i :0.0 -f null -qscale 2 -threads 1 
-vcodec mpeg1video -
ffmpeg version N-36445-gc4eec85, Copyright (c) 2000-2012 the FFmpeg 
developers
   built on Jan  5 2012 01:11:11 with gcc 4.5.3
   configuration: --prefix=/usr --libdir=/usr/lib64 
--shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared 
--cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ 
--ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 
-fomit-frame-pointer -floop-interchange -floop-strip-mine -floop-block 
-fgraphite-identity' --extra-cflags='-march=native -O2 
-fomit-frame-pointer -floop-interchange -floop-strip-mine -floop-block 
-fgraphite-identity' --extra-cxxflags='-march=native -O2 
-fomit-frame-pointer -floop-interchange -floop-strip-mine -floop-block 
-fgraphite-identity' --disable-static --enable-gpl --enable-version3 
--enable-postproc --enable-avfilter --disable-stripping --disable-debug 
--disable-doc --disable-network --disable-vaapi --disable-vdpau 
--enable-libmp3lame --enable-libvo-aacenc --enable-libvo-amrwbenc 
--enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid 
--enable-libaacplus --enable-nonfree --enable-openal --disable-indev=v4l 
--disable-indev=v4l2 --disable-indev=oss --disable-i  libavutil      51. 
34.100 / 51. 34.100
   libavcodec     53. 53.100 / 53. 53.100
   libavformat    53. 29.100 / 53. 29.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 57.101 /  2. 57.101
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  5.100 /  0.  5.100
   libpostproc    51.  2.100 / 51.  2.100
[x11grab @ 0xde6490] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1280 
height: 800
[x11grab @ 0xde6490] shared memory extension found
[x11grab @ 0xde6490] Estimating duration from bitrate, this may be 
inaccurate
Input #0, x11grab, from ':0.0':
   Duration: N/A, start: 1325844551.317414, bitrate: 982057 kb/s
     Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 1280x800, 
982057 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
Incompatible pixel format 'bgra' for codec 'mpeg1video', auto-selecting 
format 'yuv420p'
[buffer @ 0xdf41f0] w:1280 h:800 pixfmt:bgra tb:1/1000000 sar:0/1 
sws_param:
[buffersink @ 0xde6430] auto-inserting filter 'auto-inserted scale 0' 
between the filter 'src' and the filter 'out'
[scale @ 0xdf5770] w:1280 h:800 fmt:bgra -> w:1280 h:800 fmt:yuv420p 
flags:0x4
Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf53.29.100
     Stream #0:0: Video: mpeg1video, yuv420p, 1280x800, q=2-31, 200 
kb/s, 90k tbn, 29.97 tbc
Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo -> mpeg1video)
Press [q] to stop, [?] for help
frame=   19 fps=  0 q=2.0 size=       0kB time=00:00:00.60 bitrate=   
0.0kbits/s dup=11 drop=0  frame=   36 fps= 33 q=2.0 size=       0kB 
time=00:00:01.16 bitrate=   0.0kbits/s dup=20 drop=0  frame=   51 fps= 
32 q=2.0 size=       0kB time=00:00:01.66 bitrate=   0.0kbits/s dup=28 
drop=0  frame=   68 fps= 31 q=2.0 size=       0kB time=00:00:02.23 
bitrate=   0.0kbits/s dup=37 drop=0  frame=   85 fps= 31 q=2.0 
size=       0kB time=00:00:02.80 bitrate=   0.0kbits/s dup=46 drop=0  
frame=  100 fps= 31 q=2.0 size=       0kB time=00:00:03.30 bitrate=   
0.0kbits/s dup=54 drop=0  frame=  115 fps= 31 q=2.0 size=       0kB 
time=00:00:03.80 bitrate=   0.0kbits/s dup=62 drop=0  frame=  132 fps= 
31 q=2.0 size=       0kB time=00:00:04.37 bitrate=   0.0kbits/s dup=71 
drop=0  frame=  148 fps= 31 q=2.0 size=       0kB time=00:00:04.90 
bitrate=   0.0kbits/s dup=80 drop=0  frame=  164 fps= 31 q=2.0 
size=       0kB time=00:00:05.43 bitrate=   0.0kbits/s dup=89 drop=0  
frame=  179 fps= 30 q=2.0 size=       0kB time=00:00:05.93 bitrate=   
0.0kbits/s dup=97 drop=0  frame=  196 fps= 30 q=2.0 size=       0kB 
time=00:00:06.50 bitrate=   0.0kbits/s dup=106 drop=0 frame=  211 fps= 
30 q=2.0 size=       0kB time=00:00:07.00 bitrate=   0.0kbits/s dup=114 
drop=0 frame=  227 fps= 30 q=2.0 size=       0kB time=00:00:07.54 
bitrate=   0.0kbits/s dup=123 drop=0 frame=  231 fps= 30 q=2.0 
Lsize=       0kB time=00:00:07.67 bitrate=   0.0kbits/s dup=125 drop=0
video:9164kB audio:0kB global headers:0kB muxing overhead -100.000000%