[FFmpeg-user] Confusion about fieldmatch, decimate and framerate (now with yadif)

Mon Dec 2 20:01:57 CET 2013

On Monday, November 25, 2013 5:35 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

L. Lee <llee040 <at> sbcglobal.net> writes:
>
>> Is the robbins-recut.tgz available to all of us?
>
>I will upload the original sample (the one from the 
>dvd) as soon as I receive it.
>
>Note that in my tests, similar files work fine 
>with fieldmatch.
>
>Carl Eugen

>

Ok, Inserted DVD, ran: 

$ /usr/bin/mplayer -dvd-device /dev/sr0 dvd://1 -dumpfile dump-1.vob -dumpstream

$ dd if=dump-1.vob of=dd-vob-short.mkv count=400K
$ ffmpeg -t 280 -i dd-vob-short.mkv  -map 0 -c copy -c:v libx264 -vf 
"fps=30000/1001,fieldmatch,yadif=deint=interlaced" -crf 17 -preset 
veryfast dd-vob-short-fieldmatch-yadif.mkv

$ ffmpeg -t 280 -i dd-vob-short.mkv  -map 0 -c copy -c:v libx264 -vf 
"fps=30000/1001,fieldmatch" -crf 17 -preset 
veryfast dd-vob-short-fieldmatch.mkv

Both ffmpeg commands had output containing:

Frame #8158 at 272.205 is still interlaced time=00:04:31.64 bitrate=2622.3kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8159 at 272.239 is still interlaced
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8160 at 272.272 is still interlaced

So I focused on those frames. 
$ ffmpeg -t 2 -ss 271.205  -i dd-vob-short-fieldmatch-yadif.mkv  dd-vob-short-f-y-%2d.jpg

$ ffmpeg -t 2 -ss 271.205  -i dd-vob-short-fieldmatch.mkv  dd-vob-short-f-%2d.jpg

By comparing with the original frames, the desired frames are 32, 33, 34. They appear identical, including using gimp's difference filter.

I'm uploading dd-vob-short.mkv, dd-vob-short-fieldmatch-yadif.mkv, dd-vob-short-fieldmatch.mkv, and dd-vob-short-f-{,y-}3{2,3,4}.bmp as robbins-from-dvd.tgz to upload.ffmpeg.org/incoming

-Nick Robbins

Output from first ffmpeg command:

ffmpeg version 2.0.2 Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov  6 2013 20:33:17 with gcc 4.7.3 (Gentoo Hardened 4.7.3-r1 p1.3, pie-0.5.5)
  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='-O2 -pipe -march=native -fomit-frame-pointer' --extra-cflags='-O2 -pipe -march=native -fomit-frame-pointer' --extra-
cxxflags='-O2 -pipe -march=native -fomit-frame-pointer' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --
enable-nonfree --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=alsa --disable-indev=oss --disable-indev=jack --disable-outdev=alsa --disable-outdev=oss -
-disable-outdev=sdl --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-netw
ork --disable-openssl --disable-ffplay --disable-vaapi --disable-vdpau --enable-zlib --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-l
ibfdk-aac --disable-libaacplus --enable  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.100 / 55. 12.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 79.101 /  3. 79.101
  libavresample   1.  1.  0 /  1.  1.  0
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[mpeg2video @ 0x7d10c4d270] Warning: not compiled with thread support, using thread emulation
[ac3 @ 0x7d10cd9770] Warning: not compiled with thread support, using thread emulation
[ac3 @ 0x7d10cfedd0] Warning: not compiled with thread support, using thread emulation
Input #0, mpeg, from 'dd-vob-short.mkv':
  Duration: 00:04:54.19, start: 0.280633, bitrate: 5702 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:2[0x81]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
-t is not an input option, keeping it for the next output; consider fixing your command line.
[libx264 @ 0x7d10c52340] Warning: not compiled with thread support, using thread emulation
[libx264 @ 0x7d10c52340] using SAR=32/27
[libx264 @ 0x7d10c52340] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x7d10c52340] profile High, level 3.0
[libx264 @ 0x7d10c52340] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 ana
lyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 thr
eads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weig
htp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[mpeg2video @ 0x7d10c4d270] Warning: not compiled with thread support, using thread emulation
Output #0, matroska, to 'dd-vob-short-fieldmatch-yadif.mkv':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 720x480 [SAR 32:27 DAR 16:9], q=-1--1, 1k tbn, 29.97 tbc
    Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 192 kb/s
    Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  Stream #0:1 -> #0:1 (copy) 
  Stream #0:2 -> #0:2 (copy) 
Press [q] to stop, [?] for help
New subtitle stream 0:3 at pos:5425166 and DTS:16.2633s4.94 bitrate= 633.6kbits/s
Frame #1389 at 46.3463 is still interlaced time=00:00:45.76 bitrate=1593.8kbits/s
Frame #3320 at 110.777 is still interlaced time=00:01:50.17 bitrate=2392.7kbits/s
Frame #3510 at 117.117 is still interlaced time=00:01:56.92 bitrate=2489.6kbits/s
Frame #5657 at 188.755 is still interlaced time=00:03:07.90 bitrate=2464.1kbits/s
Frame #5995 at 200.033 is still interlaced time=00:03:19.58 bitrate=2478.9kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #5996 at 200.067 is still interlaced
Frame #6106 at 203.737 is still interlaced time=00:03:23.20 bitrate=2477.0kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #6107 at 203.77 is still interlaced
Frame #6181 at 206.239 is still interlaced time=00:03:25.79 bitrate=2506.3kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #6182 at 206.273 is still interlaced
Frame #6203 at 206.973 is still interlaced time=00:03:26.27 bitrate=2510.6kbits/s
Frame #6356 at 212.079 is still interlaced time=00:03:31.87 bitrate=2501.8kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #6357 at 212.112 is still interlaced
Frame #7878 at 262.863 is still interlaced time=00:04:22.52 bitrate=2509.7kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #7879 at 262.896 is still interlaced
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #7880 at 262.929 is still interlaced
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #7882 at 262.996 is still interlaced
Frame #8020 at 267.601 is still interlaced time=00:04:27.10 bitrate=2588.0kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8021 at 267.634 is still interlaced
Frame #8093 at 270.036 is still interlaced time=00:04:29.63 bitrate=2611.7kbits/s
Frame #8158 at 272.205 is still interlaced time=00:04:31.64 bitrate=2622.3kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8159 at 272.239 is still interlaced
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8160 at 272.272 is still interlaced
Frame #8207 at 273.84 is still interlacedB time=00:04:33.47 bitrate=2630.5kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8208 at 273.874 is still interlaced
Frame #8226 at 274.474 is still interlaced time=00:04:34.14 bitrate=2632.3kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8227 at 274.508 is still interlaced
Frame #8289 at 276.576 is still interlaced time=00:04:36.00 bitrate=2638.2kbits/s
[Parsed_fieldmatch_1 @ 0x7d10c54850] Frame #8290 at 276.61 is still interlaced
frame= 8392 fps= 40 q=-1.0 Lsize=   90819kB time=00:04:40.00 bitrate=2657.1kbits/s
video:77513kB audio:13125kB subtitle:0 global headers:0kB muxing overhead 0.200497%
[libx264 @ 0x7d10c52340] frame I:105   Avg QP:14.62  size: 34068
[libx264 @ 0x7d10c52340] frame P:3719  Avg QP:18.26  size: 14950
[libx264 @ 0x7d10c52340] frame B:4568  Avg QP:20.38  size:  4421
[libx264 @ 0x7d10c52340] consecutive B-frames: 17.3% 26.5% 11.8% 44.4%
[libx264 @ 0x7d10c52340] mb I  I16..4: 16.0% 54.6% 29.4%
[libx264 @ 0x7d10c52340] mb P  I16..4:  6.8% 17.4%  1.3%  P16..4: 33.5% 17.5% 13.0%  0.0%  0.0%    skip:10.4%
[libx264 @ 0x7d10c52340] mb B  I16..4:  1.1%  1.9%  0.2%  B16..8: 24.7%  8.4%  1.2%  direct:16.7%  skip:46.0%  L0:32.1% L1:42.0% BI:25.9%
[libx264 @ 0x7d10c52340] 8x8 transform intra:66.0% inter:60.5%
[libx264 @ 0x7d10c52340] coded y,uvDC,uvAC intra: 73.1% 69.4% 32.9% inter: 28.0% 26.6% 1.9%
[libx264 @ 0x7d10c52340] i16 v,h,dc,p: 36% 27% 32%  6%
[libx264 @ 0x7d10c52340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 17% 44%  3%  2%  3%  3%  3%  4%
[libx264 @ 0x7d10c52340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 41% 12%  4%  5%  5%  5%  5%  5%
[libx264 @ 0x7d10c52340] i8c dc,h,v,p: 51% 21% 23%  5%
[libx264 @ 0x7d10c52340] Weighted P-Frames: Y:10.3% UV:3.5%
[libx264 @ 0x7d10c52340] kb/s:2267.67

Second one the same build info then:Input #0, mpeg, from 'dd-vob-short.mkv':

  Duration: 00:04:54.19, start: 0.280633, bitrate: 5702 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 32:27 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:2[0x81]: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
-t is not an input option, keeping it for the next output; consider fixing your command line.
[libx264 @ 0x4b19372d0] Warning: not compiled with thread support, using thread emulation
[libx264 @ 0x4b19372d0] using SAR=32/27
[libx264 @ 0x4b19372d0] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x4b19372d0] profile High, level 3.0
[libx264 @ 0x4b19372d0] 264 - core 120 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 anal
yse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 thre
ads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weigh
tp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[mpeg2video @ 0x4b1932200] Warning: not compiled with thread support, using thread emulation
Output #0, matroska, to 'dd-vob-short-fieldmatch.mkv':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 720x480 [SAR 32:27 DAR 16:9], q=-1--1, 1k tbn, 29.97 tbc
    Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 192 kb/s
    Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, 192 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (copy)
Press [q] to stop, [?] for help
New subtitle stream 0:3 at pos:5425166 and DTS:16.2633s5.00 bitrate= 636.4kbits/s
Frame #1389 at 46.3463 is still interlaced time=00:00:45.76 bitrate=1595.1kbits/s
Frame #3320 at 110.777 is still interlaced time=00:01:50.62 bitrate=2394.5kbits/s
Frame #3510 at 117.117 is still interlaced time=00:01:56.83 bitrate=2492.3kbits/s
Frame #5657 at 188.755 is still interlaced time=00:03:08.38 bitrate=2463.3kbits/s
Frame #5995 at 200.033 is still interlaced time=00:03:19.55 bitrate=2480.3kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #5996 at 200.067 is still interlaced
Frame #6106 at 203.737 is still interlaced time=00:03:23.16 bitrate=2478.9kbits/s
Frame #6107 at 203.77 is still interlacedB time=00:03:23.61 bitrate=2487.3kbits/s
Frame #6181 at 206.239 is still interlaced time=00:03:25.79 bitrate=2509.2kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #6182 at 206.273 is still interlaced
Frame #6203 at 206.973 is still interlaced time=00:03:26.27 bitrate=2513.3kbits/s
Frame #6356 at 212.079 is still interlaced time=00:03:32.00 bitrate=2503.8kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #6357 at 212.112 is still interlaced
Frame #7878 at 262.863 is still interlaced time=00:04:22.24 bitrate=2512.2kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #7879 at 262.896 is still interlaced
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #7880 at 262.929 is still interlaced
Frame #7882 at 262.996 is still interlaced time=00:04:22.91 bitrate=2514.6kbits/s
Frame #8020 at 267.601 is still interlaced time=00:04:27.36 bitrate=2595.3kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #8021 at 267.634 is still interlaced
Frame #8093 at 270.036 is still interlaced time=00:04:29.95 bitrate=2614.5kbits/s
Frame #8158 at 272.205 is still interlaced time=00:04:31.48 bitrate=2623.6kbits/s
Frame #8159 at 272.239 is still interlaced time=00:04:32.06 bitrate=2626.4kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #8160 at 272.272 is still interlaced
Frame #8207 at 273.84 is still interlacedB time=00:04:33.34 bitrate=2631.8kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #8208 at 273.874 is still interlaced
Frame #8226 at 274.474 is still interlaced time=00:04:33.98 bitrate=2634.6kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #8227 at 274.508 is still interlaced
Frame #8289 at 276.576 is still interlaced time=00:04:36.44 bitrate=2642.1kbits/s
[Parsed_fieldmatch_1 @ 0x4b1939720] Frame #8290 at 276.61 is still interlaced
frame= 8392 fps= 40 q=-1.0 Lsize=   90944kB time=00:04:40.00 bitrate=2660.8kbits/s
video:77638kB audio:13125kB subtitle:0 global headers:0kB muxing overhead 0.200206%
[libx264 @ 0x4b19372d0] frame I:105   Avg QP:14.71  size: 34829
[libx264 @ 0x4b19372d0] frame P:3718  Avg QP:18.27  size: 14965
[libx264 @ 0x4b19372d0] frame B:4569  Avg QP:20.38  size:  4422
[libx264 @ 0x4b19372d0] consecutive B-frames: 17.2% 26.6% 11.8% 44.4%
[libx264 @ 0x4b19372d0] mb I  I16..4: 16.2% 55.0% 28.8%
[libx264 @ 0x4b19372d0] mb P  I16..4:  6.9% 17.4%  1.3%  P16..4: 33.5% 17.5% 13.0%  0.0%  0.0%    skip:10.4%
[libx264 @ 0x4b19372d0] mb B  I16..4:  1.1%  1.9%  0.2%  B16..8: 24.7%  8.4%  1.2%  direct:16.7%  skip:46.0%  L0:32.0% L1:42.1% BI:25.9%
[libx264 @ 0x4b19372d0] 8x8 transform intra:65.9% inter:60.6%
[libx264 @ 0x4b19372d0] coded y,uvDC,uvAC intra: 73.1% 69.4% 33.1% inter: 28.0% 26.6% 1.9%
[libx264 @ 0x4b19372d0] i16 v,h,dc,p: 36% 27% 32%  5%
[libx264 @ 0x4b19372d0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 17% 44%  3%  2%  3%  3%  3%  4%
[libx264 @ 0x4b19372d0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 44% 11%  4%  4%  5%  4%  5%  5%
[libx264 @ 0x4b19372d0] i8c dc,h,v,p: 51% 21% 23%  5%
[libx264 @ 0x4b19372d0] Weighted P-Frames: Y:10.2% UV:3.4%
[libx264 @ 0x4b19372d0] kb/s:2271.33

third:
Input #0, matroska,webm, from 'dd-vob-short-fieldmatch-yadif.mkv':
  Metadata:
    ENCODER         : Lavf55.12.100
  Duration: 00:04:40.08, start: 0.000000, bitrate: 2656 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 720x480 [SAR 32:27 DAR 16:9], SAR 186:157 DAR 279:157, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
    Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
-t is not an input option, keeping it for the next output; consider fixing your command line.
[bmp @ 0x4969199070] Warning: not compiled with thread support, using thread emulation
[h264 @ 0x4969193490] Warning: not compiled with thread support, using thread emulation
Output #0, image2, to 'bmps/dd-vob-short-f-y-%2d.bmp':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: bmp, bgr24, 720x480 [SAR 186:157 DAR 279:157], q=2-31, 200 kb/s, 90k tbn, 29.97 tbc (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> bmp)
Press [q] to stop, [?] for help
frame=   60 fps= 49 q=-1.0 Lsize=N/A time=00:00:02.00 bitrate=N/A dup=0 drop=31
video:60753kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000035%

fourth:

Input #0, matroska,webm, from 'dd-vob-short-fieldmatch.mkv':
  Metadata:
    ENCODER         : Lavf55.12.100
  Duration: 00:04:40.08, start: 0.000000, bitrate: 2660 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 720x480 [SAR 32:27 DAR 16:9], SAR 186:157 DAR 279:157, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
    Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
-t is not an input option, keeping it for the next output; consider fixing your command line.
[bmp @ 0x19d01737c0] Warning: not compiled with thread support, using thread emulation
[h264 @ 0x19d016dbe0] Warning: not compiled with thread support, using thread emulation
Output #0, image2, to 'bmps/dd-vob-short-f-%2d.bmp':
  Metadata:
    encoder         : Lavf55.12.100
    Stream #0:0: Video: bmp, bgr24, 720x480 [SAR 186:157 DAR 279:157], q=2-31, 200 kb/s, 90k tbn, 29.97 tbc (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> bmp)
Press [q] to stop, [?] for help
frame=   60 fps= 54 q=-1.0 Lsize=N/A time=00:00:02.00 bitrate=N/A dup=0 drop=31    
video:60753kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000035%