[FFmpeg-user] Performance issue/question (maybe my misunderstanding)

Frank Häfemeier ffmpeg at frank.haefemeier.eu
Mon Aug 20 16:38:32 CEST 2012


Hi,
I am a little confused about, what kind of resources are needed to
transcode a video for example 'mpeg2video -> libx264', as in my case. It
can't be ruled out my understanding is wrong, but it confused me. But
let me explain from the beginning.

I have two computer. An older one with an 'Intel(R) Core(TM)2 Duo CPU
E8400 @ 3.00GHz' and a brand new 'Intel(R) Core(TM) i7-3930K CPU @
3.20GHz'. The first has two cores (2 threads, 6M cache), the second 6
cores (12 threads, 12M cache).

My thoughts are the second should be faster to transcode videos as the
first one. But it isn't! My new computer was <10% faster as the other.
It seems to me there are some parameter which are influent the process.
But I have no idea which?

To my background: I am not new to computer at all or there architecture
(> 20 year experience in linux environment and software development),
but started to undersand how video transcoding works.

You will find attached a textfile with a complete console output of a
transcoding the same video on both machines. If you need more, please
contact me.

Any hints, possible explanations or discussions are welcome.

Bye
	Frank

P.S.: Please don't misunderstand me. It isn't the absolute time, it is
the small differences between them. 
-------------- next part --------------
Mordor (Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz):

/home/frank/software/bin/ffmpeg -benchmark -i 00000.m2v -i 00000-02.mp2  -filter:v yadif -b:v 3000k -preset veryslow -b:a 192k ACDC-LiveatRiverPlate1.mp4
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug  9 2012 19:51:02 with gcc 4.7.0 20120507 (Red Hat 4.7.0-5)
  configuration: --prefix=/home/frank/software --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-openssl --enable-libfaac --enable-libpulse --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --enable-gpl --enable-nonfree --disable-shared --enable-postproc --extra-cflags=-I/home/frank/software/include --extra-ldflags=-L/home/frank/software/lib
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[mpegvideo @ 0x262ca80] max_analyze_duration 5000000 reached at 5000000
[mpegvideo @ 0x262ca80] Estimating duration from bitrate, this may be inaccurate
Input #0, mpegvideo, from '00000.m2v':
  Duration: 01:20:35.62, bitrate: 4139 kb/s
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 4139 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc
[mp3 @ 0x2633ee0] max_analyze_duration 5000000 reached at 5016000
[mp3 @ 0x2633ee0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from '00000-02.mp2':
  Duration: 00:59:47.90, start: 0.000000, bitrate: 256 kb/s
    Stream #1:0: Audio: mp2, 48000 Hz, stereo, s16, 256 kb/s
[buffer @ 0x2777680] w:720 h:576 pixfmt:yuv420p tb:1/1200000 sar:64/45 sws_param:flags=2
[buffersink @ 0x26c6600] No opaque field provided
[yadif @ 0x27353a0] mode:0 parity:-1 auto_enable:0
[libx264 @ 0x2611080] using SAR=64/45
[libx264 @ 0x2611080] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[libx264 @ 0x2611080] profile High, level 4.0
[libx264 @ 0x2611080] 264 - core 125 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=3000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'ACDC-LiveatRiverPlate1.mp4':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=-1--1, 3000 kb/s, 25 tbn, 25 tbc
    Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 48000 Hz, stereo, s16, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  Stream #1:0 -> #0:1 (mp2 -> libfaac)
Press [q] to stop, [?] for help
Header missings=4.9 q=25.0 size= 1241394kB time=00:53:32.00 bitrate=3166.1kbits/s    
Error while decoding stream #1:0
frame=89698 fps=4.9 q=-1.0 Lsize= 1394436kB time=00:59:47.84 bitrate=3183.9kbits/s    
video:1319435kB audio:72450kB global headers:0kB muxing overhead 0.183261%
[libx264 @ 0x2611080] frame I:867   Avg QP:19.12  size: 50671
[libx264 @ 0x2611080] frame P:22154 Avg QP:22.81  size: 24420
[libx264 @ 0x2611080] frame B:66677 Avg QP:25.16  size: 11491
[libx264 @ 0x2611080] consecutive B-frames:  3.0%  4.1% 19.9% 17.7% 11.5% 42.1%  1.3%  0.2%  0.1%
[libx264 @ 0x2611080] mb I  I16..4:  8.9% 71.9% 19.2%
[libx264 @ 0x2611080] mb P  I16..4:  8.3% 32.6%  3.9%  P16..4: 30.6% 15.0%  7.1%  0.7%  0.1%    skip: 1.6%
[libx264 @ 0x2611080] mb B  I16..4:  1.4%  4.4%  0.6%  B16..8: 41.8% 13.5%  3.5%  direct:15.2%  skip:19.6%  L0:42.3% L1:38.3% BI:19.4%
[libx264 @ 0x2611080] final ratefactor: 19.49
[libx264 @ 0x2611080] 8x8 transform intra:71.6% inter:78.6%
[libx264 @ 0x2611080] direct mvs  spatial:100.0% temporal:0.0%
[libx264 @ 0x2611080] coded y,uvDC,uvAC intra: 69.5% 87.6% 50.8% inter: 41.5% 50.3% 8.4%
[libx264 @ 0x2611080] i16 v,h,dc,p: 40% 19% 12% 29%
[libx264 @ 0x2611080] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20%  9% 11%  7%  9% 13%  9% 13%  9%
[libx264 @ 0x2611080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20%  7%  4%  8% 12% 16% 10% 13%  9%
[libx264 @ 0x2611080] i8c dc,h,v,p: 27% 24% 30% 20%
[libx264 @ 0x2611080] Weighted P-Frames: Y:18.8% UV:16.0%
[libx264 @ 0x2611080] ref P L0: 44.7% 11.8% 14.9%  6.8%  4.7%  3.6%  2.8%  2.0%  1.7%  1.5%  1.2%  1.1%  0.9%  0.8%  0.7%  0.6%
[libx264 @ 0x2611080] ref B L0: 78.7%  8.7%  3.8%  2.1%  1.5%  1.1%  0.9%  0.6%  0.6%  0.5%  0.4%  0.4%  0.3%  0.2%  0.1%
[libx264 @ 0x2611080] ref B L1: 94.9%  5.1%
[libx264 @ 0x2611080] kb/s:3012.55
bench: utime=197763.114s maxrss=361764kB

real	306m10.332s
user	3296m3.142s
sys	5m22.650s


Gondor (Intel(R) Core(TM)2 Duo CPU     E8400  @ 3.00GHz):

/home/frank/software/bin/ffmpeg -benchmark -i 00000.m2v -i 00000-02.mp2  -filter:v yadif -b:v 3000k -preset veryslow -b:a 192k ACDC-LiveatRiverPlate1.mp4
ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jun 13 2012 20:11:25 with gcc 4.6.3 20120306 (Red Hat 4.6.3-2)
  configuration: --prefix=/home/frank/software --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-openssl --enable-libfaac --enable-libpulse --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --enable-gpl --enable-nonfree --disable-shared --enable-postproc --extra-cflags=-I/home/frank/software/include --extra-ldflags=-L/home/frank/software/lib
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[mpegvideo @ 0x303ea80] max_analyze_duration 5000000 reached at 5000000
[mpegvideo @ 0x303ea80] Estimating duration from bitrate, this may be inaccurate
Input #0, mpegvideo, from '00000.m2v':
  Duration: 01:20:35.62, bitrate: 4139 kb/s
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 4139 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc
[mp3 @ 0x3045ee0] max_analyze_duration 5000000 reached at 5016000
[mp3 @ 0x3045ee0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from '00000-02.mp2':
  Duration: 00:59:47.90, start: 0.000000, bitrate: 256 kb/s
    Stream #1:0: Audio: mp2, 48000 Hz, stereo, s16, 256 kb/s
[buffer @ 0x3189680] w:720 h:576 pixfmt:yuv420p tb:1/1200000 sar:64/45 sws_param:flags=2
[buffersink @ 0x30d8600] No opaque field provided
[yadif @ 0x31473a0] mode:0 parity:-1 auto_enable:0
[libx264 @ 0x3023080] using SAR=64/45
[libx264 @ 0x3023080] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
[libx264 @ 0x3023080] profile High, level 4.0
[libx264 @ 0x3023080] 264 - core 125 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=3000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'ACDC-LiveatRiverPlate1.mp4':
  Metadata:
    encoder         : Lavf54.6.100
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=-1--1, 3000 kb/s, 25 tbn, 25 tbc
    Stream #0:1: Audio: aac (@[0][0][0] / 0x0040), 48000 Hz, stereo, s16, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  Stream #1:0 -> #0:1 (mp2 -> libfaac)
Press [q] to stop, [?] for help
Header missings=4.2 q=25.0 size= 1241524kB time=00:53:32.80 bitrate=3165.6kbits/s     
Error while decoding stream #1:0
frame=89698 fps=4.2 q=32766.0 Lsize= 1394067kB time=00:59:47.84 bitrate=3183.0kbits/s    
video:1319073kB audio:72450kB global headers:0kB muxing overhead 0.182841%
[libx264 @ 0x3023080] frame I:880   Avg QP:19.10  size: 50643
[libx264 @ 0x3023080] frame P:21558 Avg QP:22.75  size: 24627
[libx264 @ 0x3023080] frame B:67260 Avg QP:25.13  size: 11526
[libx264 @ 0x3023080] consecutive B-frames:  2.8%  3.6% 18.5% 16.8% 11.7% 44.8%  1.5%  0.2%  0.1%
[libx264 @ 0x3023080] mb I  I16..4:  8.8% 72.0% 19.2%
[libx264 @ 0x3023080] mb P  I16..4:  8.2% 32.5%  3.9%  P16..4: 30.5% 15.3%  7.2%  0.7%  0.1%    skip: 1.6%
[libx264 @ 0x3023080] mb B  I16..4:  1.4%  4.4%  0.6%  B16..8: 41.9% 13.6%  3.5%  direct:15.2%  skip:19.5%  L0:42.4% L1:38.2% BI:19.4%
[libx264 @ 0x3023080] final ratefactor: 19.48
[libx264 @ 0x3023080] 8x8 transform intra:71.5% inter:78.6%
[libx264 @ 0x3023080] direct mvs  spatial:100.0% temporal:0.0%
[libx264 @ 0x3023080] coded y,uvDC,uvAC intra: 69.5% 87.6% 50.9% inter: 41.5% 50.4% 8.4%
[libx264 @ 0x3023080] i16 v,h,dc,p: 40% 19% 12% 29%
[libx264 @ 0x3023080] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20%  9% 11%  7%  9% 13%  8% 13%  9%
[libx264 @ 0x3023080] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19%  7%  4%  8% 12% 16% 10% 13%  9%
[libx264 @ 0x3023080] i8c dc,h,v,p: 27% 24% 30% 20%
[libx264 @ 0x3023080] Weighted P-Frames: Y:19.0% UV:16.2%
[libx264 @ 0x3023080] ref P L0: 44.4% 11.6% 14.8%  7.0%  4.8%  3.7%  2.9%  2.1%  1.7%  1.5%  1.2%  1.1%  0.9%  0.8%  0.7%  0.6%
[libx264 @ 0x3023080] ref B L0: 78.7%  8.5%  3.8%  2.1%  1.5%  1.2%  1.0%  0.7%  0.6%  0.5%  0.4%  0.4%  0.3%  0.2%  0.1%
[libx264 @ 0x3023080] ref B L1: 95.0%  5.0%
[libx264 @ 0x3023080] kb/s:3011.73
bench: utime=42209.772s maxrss=255656kB

real	355m8.107s
user	703m29.818s
sys	0m29.021s



More information about the ffmpeg-user mailing list