[FFmpeg-user] speeding up filter complex

Sat Jun 28 11:38:41 CEST 2014

Trying to make a quad out of 4 input files.
All works swell, but the rendering is slow, while the process is only taking 
up 15% CPU.
(With -threads 12 i'm getting 31 fps. Setting threads to 2 gives almost the 
same speed, threads set to 1 gives my 28 fps.)
IO speed is not the bottleneck, as the input files are quite small.
Anything i can do to speed up the process?
Thx,

Bouke

C:\Users\Bouke\Desktop\BMtest\xtras\ffmpeg.exe -threads 12 -r 25 -ss 
0.600 -i C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_3.dnx -r 25 -i 
C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_4.dnx -r 25 -ss 1.880 -i 
C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_1.dnx -r 25 -ss 1.240 -i 
C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_2.dnx -filter_complex 
"nullsrc=size=1920x1080 [base]; [0:v] setpts=PTS-STARTPTS, scale=960x540 
[upperleft]; [1:v] setpts=PTS-STARTPTS, scale=960x540 [upperright]; [2:v] 
setpts=PTS-STARTPTS, scale=960x540 [lowerleft]; [3:v] setpts=PTS-STARTPTS, 
scale=960x540 [lowerright]; [base][upperleft] overlay=shortest=1 [tmp1]; 
[tmp1][upperright] overlay=shortest=1:x=960 [tmp2]; [tmp2][lowerleft] 
overlay=shortest=1:y=540 [tmp3]; [tmp3][lowerright] 
overlay=shortest=1:x=960:y=540" -b:v 36M -vcodec dnxhd -f rawvideo -an 
C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_quad.dnx 2>&1

 -- "ffmpeg version N-60087-g94a5241 Copyright (c) 2000-2014 the FFmpeg 
developers
  built on Jan 21 2014 22:06:13 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth 
 --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv 
 --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm 
 --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb 
 --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp 
 --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora 
 --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc 
 --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs 
 --enable-libxvid --enable-zlib
  libavutil      52. 63.100 / 52. 63.100
  libavcodec     55. 48.102 / 55. 48.102
  libavformat    55. 25.101 / 55. 25.101
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     4.  1.100 /  4.  1.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, dnxhd, from 
'C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_3.dnx':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: dnxhd, yuv422p, 1920x1080, 25 fps, 25 tbr, 1200k 
tbn, 25 tbc
Input #1, dnxhd, from 
'C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_4.dnx':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: dnxhd, yuv422p, 1920x1080, 25 fps, 25 tbr, 1200k 
tbn, 25 tbc
Input #2, dnxhd, from 
'C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_1.dnx':
  Duration: N/A, bitrate: N/A
    Stream #2:0: Video: dnxhd, yuv422p, 1920x1080, 25 fps, 25 tbr, 1200k 
tbn, 25 tbc
Input #3, dnxhd, from 
'C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_2.dnx':
  Duration: N/A, bitrate: N/A
    Stream #3:0: Video: dnxhd, yuv422p, 1920x1080, 25 fps, 25 tbr, 1200k 
tbn, 25 tbc
Output #0, rawvideo, to 
'C:\Users\Bouke\Desktop\Adobe\creating\10_35_31_09_quad.dnx':
  Metadata:
    encoder         : Lavf55.25.101
    Stream #0:0: Video: dnxhd, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], 
q=2-1024, 36000 kb/s, 90k tbn, 25 tbc (default)
Stream mapping:
  Stream #0:0 (dnxhd) -> setpts
  Stream #1:0 (dnxhd) -> setpts
  Stream #2:0 (dnxhd) -> setpts
  Stream #3:0 (dnxhd) -> setpts
  overlay -> Stream #0:0 (dnxhd)
Press [q] to stop, [?] for help
frame=   14 fps=0.0 q=1.0 size=    2576kB time=00:00:00.56 
bitrate=37683.2kbits/s
frame=   29 fps= 29 q=1.0 size=    5336kB time=00:00:01.16 
bitrate=37683.2kbits/s
frame=   45 fps= 30 q=1.0 size=    8280kB time=00:00:01.80 
bitrate=37683.2kbits/s
frame=   61 fps= 30 q=1.0 size=   11224kB time=00:00:02.44 
bitrate=37683.2kbits/s
frame=   76 fps= 30 q=1.0 size=   13984kB time=00:00:03.04 
bitrate=37683.2kbits/s
frame=   92 fps= 30 q=1.0 size=   16928kB time=00:00:03.68 
bitrate=37683.2kbits/s
frame=  108 fps= 31 q=1.0 size=   19872kB time=00:00:04.32 
bitrate=37683.2kbits/s
frame=  123 fps= 31 q=1.0 size=   22632kB time=00:00:04.92 
bitrate=37683.2kbits/s
frame=  139 fps= 31 q=1.0 size=   25576kB time=00:00:05.56 
bitrate=37683.2kbits/s
frame=  155 fps= 31 q=1.0 size=   28520kB time=00:00:06.20 
bitrate=37683.2kbits/s
frame=  170 fps= 31 q=1.0 size=   31280kB time=00:00:06.80 
bitrate=37683.2kbits/s
frame=  186 fps= 31 q=1.0 size=   34224kB time=00:00:07.44 
bitrate=37683.2kbits/s
frame=  202 fps= 31 q=1.0 size=   37168kB time=00:00:08.08 
bitrate=37683.2kbits/s
frame=  217 fps= 31 q=1.0 size=   39928kB time=00:00:08.68 
bitrate=37683.2kbits/s
frame=  233 fps= 31 q=1.0 size=   42872kB time=00:00:09.32 
bitrate=37683.2kbits/s
frame=  249 fps= 31 q=1.0 size=   45816kB time=00:00:09.96 
bitrate=37683.2kbits/s
frame=  264 fps= 31 q=1.0 size=   48576kB time=00:00:10.56 
bitrate=37683.2kbits/s
frame=  272 fps= 31 q=1.0 Lsize=   50048kB time=00:00:10.88 
bitrate=37683.2kbits/s

video:50048kB audio:0kB subtitle:0 global headers:0kB muxing overhead 
0.000000%
"

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