ffmpeg_error.txt

# ffmpeg  -i hello.opus -i hello.mp4 final_result.mp4
ffmpeg version 3.2.6 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Alpine 6.3.0)
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libmp3lame --enable-librtmp --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-x11grab --disable-stripping --disable-static --enable-vaapi --enable-libopus --disable-debug
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Input #0, ogg, from 'hello.opus':
  Duration: 00:00:03.92, start: -0.020000, bitrate: 26 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55dad44b27c0] Missing key frame while reordering index according to edit list
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55dad44b27c0] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 640x480, 1773 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'hello.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.56.101
  Duration: 00:00:04.60, bitrate: 1776 kb/s
    Stream #1:0(und): Video: h264 (avc1 / 0x31637661), none, 640x480, 1773 kb/s, 27.82 fps, 30 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      handler_name    : VideoHandler
[buffer @ 0x55dad44631c0] Unable to parse option value "-1" as pixel format
    Last message repeated 1 times
[buffer @ 0x55dad44631c0] Error setting option pix_fmt to value -1.
[graph 0 input from stream 1:0 @ 0x55dad44630c0] Error applying options to the filter.
Error opening filters!