[FFmpeg-user] Single-field deinterlace with nnedi

Paul B Mahol onemda at gmail.com
Sat Apr 30 11:13:12 EEST 2022


On Sat, Apr 30, 2022 at 8:51 AM Alexander Zhang <zhangalexy at gmail.com>
wrote:

> Hello,
>
> I'm trying to use nnedi to deinterlace a 29.97 fps video without
> doubling the frame rate. I added the fields=a option which I thought was
> supposed to make nnedi only use one of the two fields, but the output is
> still 59.94 fps. Is this a bug or am I misunderstanding something?
>

Filter still produces same number of frames as input in field mode.
Just every second frame is duplicated in output file because of fixed frame
rate.


>
> Here's the command and the output:
> $ ffmpeg -i foo.mkv -vf nnedi=weights=nnedi3_weights.bin:field=a bar.mkv
> ffmpeg version 4.4.2 Copyright (c) 2000-2021 the FFmpeg developers
>    built with gcc 11 (GCC)
>    configuration: --prefix=/usr --bindir=/usr/bin
> --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg
> --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man
> --arch=x86_64 --optflags='-O2 -flto=auto -ffat-lto-objects -fexceptions
> -g -grecord-gcc-switches -pipe -Wall -Werror=format-security
> -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
> -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
> -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
> -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
> --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
> -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
> -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 ' --extra-cflags='
> -I/usr/include/rav1e' --enable-libopencore-amrnb
> --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3
> --enable-bzlib --enable-chromaprint --disable-crystalhd
> --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls
> --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass
> --enable-libbluray --enable-libbs2b --enable-libcdio --enable-libdrm
> --enable-libjack --enable-libfreetype --enable-libfribidi
> --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libmysofa
> --enable-nvenc --enable-openal --enable-opencl --enable-opengl
> --enable-libopenjpeg --enable-libopenmpt --enable-libopus
> --enable-libpulse --enable-librsvg --enable-librav1e --enable-librtmp
> --enable-librubberband --enable-libsmbclient --enable-version3
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt
> --enable-libssh --enable-libsvtav1 --enable-libtesseract
> --enable-libtheora --enable-libtwolame --enable-libvorbis
> --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-version3
> --enable-vapoursynth --enable-libvpx --enable-vulkan --enable-libglslang
> --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid
> --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi
> --enable-lv2 --enable-avfilter --enable-avresample --enable-libmodplug
> --enable-postproc --enable-pthreads --disable-static --enable-shared
> --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64
> --enable-lto --enable-libmfx --enable-runtime-cpudetect
>    libavutil      56. 70.100 / 56. 70.100
>    libavcodec     58.134.100 / 58.134.100
>    libavformat    58. 76.100 / 58. 76.100
>    libavdevice    58. 13.100 / 58. 13.100
>    libavfilter     7.110.100 /  7.110.100
>    libavresample   4.  0.  0 /  4.  0.  0
>    libswscale      5.  9.100 /  5.  9.100
>    libswresample   3.  9.100 /  3.  9.100
>    libpostproc    55.  9.100 / 55.  9.100
> Input #0, matroska,webm, from 'foo.mkv':
>    Metadata:
>      ENCODER         : Lavf58.76.100
>    Duration: 00:00:15.02, start: 0.000000, bitrate: 9479 kb/s
>    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, top coded first
> (swapped)), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn,
> 59.94 tbc (default)
>      Metadata:
>        DURATION        : 00:00:15.015000000
> Stream mapping:
>    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
> Press [q] to stop, [?] for help
> [libx264 @ 0x55ee59541800] using SAR=1/1
> [libx264 @ 0x55ee59541800] using cpu capabilities: MMX2 SSE2Fast SSSE3
> SSE4.2 AVX FMA3 BMI2 AVX2
> [libx264 @ 0x55ee59541800] profile High, level 4.2, 4:2:0, 8-bit
> [libx264 @ 0x55ee59541800] 264 - core 163 r3060 5db6aa6 - H.264/MPEG-4
> AVC codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html -
> options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7
> psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
> 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6
> lookahead_threads=1 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 weightp=2 keyint=250
> keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
> mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
> aq=1:1.00
> Output #0, matroska, to 'bar.mkv':
>    Metadata:
>      encoder         : Lavf58.76.100
>    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p(tv, bt709,
> progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 59.94 fps, 1k tbn
> (default)
>      Metadata:
>        DURATION        : 00:00:15.015000000
>        encoder         : Lavc58.134.100 libx264
>      Side data:
>        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
> frame=  450 fps= 20 q=-1.0 Lsize=    1847kB time=00:00:14.91
> bitrate=1014.2kbits/s speed=0.654x
> video:1843kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.199605%
> [libx264 @ 0x55ee59541800] frame I:2     Avg QP:10.29  size: 23832
> [libx264 @ 0x55ee59541800] frame P:147   Avg QP:17.66  size:  7200
> [libx264 @ 0x55ee59541800] frame B:301   Avg QP:18.50  size:  2593
> [libx264 @ 0x55ee59541800] consecutive B-frames:  8.4%  3.6% 10.7% 77.3%
> [libx264 @ 0x55ee59541800] mb I  I16..4: 76.3% 20.3%  3.5%
> [libx264 @ 0x55ee59541800] mb P  I16..4:  3.5%  6.9%  0.1%  P16..4:
> 15.4%  1.3%  1.3%  0.0%  0.0%    skip:71.4%
> [libx264 @ 0x55ee59541800] mb B  I16..4:  0.2%  0.1%  0.0%  B16..8:
> 10.9%  0.2%  0.0%  direct: 5.1%  skip:83.5%  L0:47.7% L1:51.7% BI: 0.6%
> [libx264 @ 0x55ee59541800] 8x8 transform intra:59.5% inter:96.0%
> [libx264 @ 0x55ee59541800] coded y,uvDC,uvAC intra: 11.2% 56.7% 16.9%
> inter: 1.9% 11.2% 0.1%
> [libx264 @ 0x55ee59541800] i16 v,h,dc,p: 64% 22%  6%  7%
> [libx264 @ 0x55ee59541800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18%  9% 69%
> 1%  1%  1%  1%  1%  0%
> [libx264 @ 0x55ee59541800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 18% 22%
> 3%  3%  4%  2%  3%  2%
> [libx264 @ 0x55ee59541800] i8c dc,h,v,p: 50% 23% 25%  3%
> [libx264 @ 0x55ee59541800] Weighted P-Frames: Y:4.8% UV:2.7%
> [libx264 @ 0x55ee59541800] ref P L0: 64.4%  2.3% 22.3% 10.5%  0.5%
> [libx264 @ 0x55ee59541800] ref B L0: 89.5%  8.5%  2.0%
> [libx264 @ 0x55ee59541800] ref B L1: 96.5%  3.5%
> [libx264 @ 0x55ee59541800] kb/s:1005.15
>
> Thanks,
> Alex
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