ffmpeg -r 1 -f image2 -i hotel%03d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p test.mp4
ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.0 (Gentoo 9.1.0-r1 p1.1)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-4.1.4/html --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 -pipe' --disable-static --enable-avfilter --enable-avresample --disable-stripping --disable-optimizations --disable-libcelt --enable-nonfree --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-version3 --enable-bzlib --enable-runtime-cpudetect --disable-debug --disable-gcrypt --disable-gnutls --enable-gmp --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-libtls --disable-libxml2 --enable-lzma --enable-network --enable-opencl --enable-openssl --enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --enable-vaapi --enable-vdpau --enable-xlib --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --enable-libcaca --enable-openal --enable-opengl --disable-libv4l2 --disable-libpulse --disable-libdrm --disable-libjack --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libcodec2 --disable-libfdk-aac --enable-libopenjpeg --enable-libbluray --enable-libgme --disable-libgsm --disable-mmal --disable-libmodplug --enable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libspeex --disable-libsrt --enable-librsvg --disable-ffnvcodec --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-appkit --disable-libbs2b --disable-chromaprint --disable-libflite --disable-frei0r --disable-libfribidi --enable-fontconfig --disable-ladspa --enable-libass --disable-lv2 --enable-libfreetype --enable-librubberband --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-libvo-amrwbenc --enable-libmp3lame --disable-libkvazaar --disable-libaom --disable-libopenh264 --disable-libsnappy --enable-libtheora --disable-libtwolame --disable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --disable-gnutls --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-vfpv3 --disable-armv8 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=host --disable-doc --disable-htmlpages --enable-manpages
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, image2, from 'hotel%03d.png':
  Duration: 00:00:15.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgba(pc), 446x500 [SAR 2835:2835 DAR 223:250], 1 fps, 1 tbr, 1 tbn, 1 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x560c3fdec4c0] using SAR=1/1
[libx264 @ 0x560c3fdec4c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x560c3fdec4c0] profile High, level 2.2, 4:2:0, 8-bit
[libx264 @ 0x560c3fdec4c0] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=25.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'test.mp4':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 446x500 [SAR 1:1 DAR 223:250], q=-1--1, 1 fps, 16384 tbn, 1 tbc
    Metadata:
      encoder         : Lavc58.35.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   15 fps=0.0 q=-1.0 Lsize=      34kB time=00:00:12.00 bitrate=  23.3kbits/s speed= 252x
video:33kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.010467%
[libx264 @ 0x560c3fdec4c0] frame I:2     Avg QP: 6.74  size:  9623
[libx264 @ 0x560c3fdec4c0] frame P:5     Avg QP:15.91  size:  1853
[libx264 @ 0x560c3fdec4c0] frame B:8     Avg QP:20.80  size:   592
[libx264 @ 0x560c3fdec4c0] consecutive B-frames: 20.0% 26.7%  0.0% 53.3%
[libx264 @ 0x560c3fdec4c0] mb I  I16..4: 66.6%  0.1% 33.3%
[libx264 @ 0x560c3fdec4c0] mb P  I16..4:  0.8%  0.0%  4.5%  P16..4:  3.4%  0.3%  0.0%  0.0%  0.0%    skip:90.8%
[libx264 @ 0x560c3fdec4c0] mb B  I16..4:  0.0%  0.0%  0.8%  B16..8:  3.9%  0.2%  0.0%  direct: 0.1%  skip:95.0%  L0: 9.5% L1:90.5% BI: 0.0%
[libx264 @ 0x560c3fdec4c0] 8x8 transform intra:0.1% inter:2.4%
[libx264 @ 0x560c3fdec4c0] coded y,uvDC,uvAC intra: 25.9% 2.9% 2.8% inter: 0.5% 0.2% 0.2%
[libx264 @ 0x560c3fdec4c0] i16 v,h,dc,p: 93%  3%  4%  0%
[libx264 @ 0x560c3fdec4c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0% 50% 50%  0%  0%  0%  0%  0%  0%
[libx264 @ 0x560c3fdec4c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 33% 17%  1%  1%  1%  1%  2%  1%
[libx264 @ 0x560c3fdec4c0] i8c dc,h,v,p: 98%  0%  1%  0%
[libx264 @ 0x560c3fdec4c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x560c3fdec4c0] ref P L0: 93.9%  0.4%  5.6%
[libx264 @ 0x560c3fdec4c0] ref B L0: 91.6%  8.4%
[libx264 @ 0x560c3fdec4c0] ref B L1: 91.4%  8.6%
[libx264 @ 0x560c3fdec4c0] kb/s:17.73