ffmpeg-8bit -f image2 -framerate 24 -i new_frames/%d.png -i audio.m4a  -r 24 -vf "crop=1434:955:3:0,scale=1280:720" -pix_fmt yuv420p -c:v libx264 -preset slow -level 5.1 -crf 18 -c:a copy  film.mp4
ffmpeg version N-83737-g68ee800 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.5-2ubuntu1~14.04.1)
  configuration: --prefix=/home/lm17x64/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/lm17x64/ffmpeg_build/include --extra-ldflags=-L/home/lm17x64/ffmpeg_build/lib --bindir=/home/lm17x64/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  libavutil      55. 47.101 / 55. 47.101
  libavcodec     57. 82.100 / 57. 82.100
  libavformat    57. 66.103 / 57. 66.103
  libavdevice    57.  3.100 / 57.  3.100
  libavfilter     6. 74.100 /  6. 74.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
Input #0, image2, from 'new_frames/%d.png':
  Duration: 01:46:25.46, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, gray(pc), 1440x960, 24 fps, 24 tbr, 24 tbn, 24 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'audio.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: M4A mp42isom
    creation_time   : 2017-05-09T03:42:13.000000Z
    encoder         : fdkaac 0.6.1, libfdk-aac 3.4.12, VBR mode 4
    iTunSMPB        :  00000000 00000800 00000200 000000001244CA00 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  Duration: 01:46:25.43, start: 0.042667, bitrate: 98 kb/s
    Stream #1:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 97 kb/s (default)
    Metadata:
      creation_time   : 2017-05-09T03:42:13.000000Z
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[image2 @ 0x2a93ac0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[swscaler @ 0x2ac4a80] Warning: data is not aligned! This can lead to a speedloss
[libx264 @ 0x2a9ece0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x2a9ece0] profile High, level 5.1
[libx264 @ 0x2a9ece0] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 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=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'film.mp4':
  Metadata:
    encoder         : Lavf57.66.103
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 24 fps, 12288 tbn, 24 tbc
    Metadata:
      encoder         : Lavc57.82.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 97 kb/s (default)
    Metadata:
      creation_time   : 2017-05-09T03:42:13.000000Z
[png @ 0x2ab7740] chunk too big=  867335kB time=00:42:41.72 bitrate=2773.6kbits/s speed=1.23x
Error while decoding stream #0:0: Invalid data found when processing input
frame=61563 fps= 29 q=-1.0 Lsize=  915089kB time=01:46:25.36 bitrate=1174.0kbits/s speed=3.06x
video:836874kB audio:75786kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.266088%
[libx264 @ 0x2a9ece0] frame I:382   Avg QP:14.45  size: 55942
[libx264 @ 0x2a9ece0] frame P:16599 Avg QP:17.72  size: 25186
[libx264 @ 0x2a9ece0] frame B:44582 Avg QP:19.79  size:  9365
[libx264 @ 0x2a9ece0] consecutive B-frames:  3.2%  0.5%  0.7% 95.6%
[libx264 @ 0x2a9ece0] mb I  I16..4:  6.3% 78.6% 15.1%
[libx264 @ 0x2a9ece0] mb P  I16..4:  1.5%  9.3%  0.9%  P16..4: 46.9% 23.7% 10.0%  0.0%  0.0%    skip: 7.6%
[libx264 @ 0x2a9ece0] mb B  I16..4:  0.1%  0.9%  0.1%  B16..8: 45.5% 10.1%  1.6%  direct: 8.0%  skip:33.7%  L0:46.6% L1:43.5% BI: 9.9%
[libx264 @ 0x2a9ece0] 8x8 transform intra:79.6% inter:69.2%
[libx264 @ 0x2a9ece0] direct mvs  spatial:100.0% temporal:0.0%
[libx264 @ 0x2a9ece0] coded y,uvDC,uvAC intra: 68.2% 0.6% 0.1% inter: 27.7% 0.3% 0.0%
[libx264 @ 0x2a9ece0] i16 v,h,dc,p: 29% 16%  9% 46%
[libx264 @ 0x2a9ece0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 13%  7% 11% 12% 10% 11% 10%
[libx264 @ 0x2a9ece0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15%  8% 11%  9% 14% 14% 11%  9%  9%
[libx264 @ 0x2a9ece0] i8c dc,h,v,p: 99%  1%  0%  0%
[libx264 @ 0x2a9ece0] Weighted P-Frames: Y:14.8% UV:0.2%
[libx264 @ 0x2a9ece0] ref P L0: 41.6% 10.5% 23.4% 10.9% 11.1%  2.6%  0.0%
[libx264 @ 0x2a9ece0] ref B L0: 70.9% 19.6%  6.8%  2.7%
[libx264 @ 0x2a9ece0] ref B L1: 93.4%  6.6%
[libx264 @ 0x2a9ece0] kb/s:2672.65