Add support for rotated videos

[Giovanni Musto]

When recording in portrait many phones will not produce a 9:16 video (e.g. 1080x1920), but a standard 16:9 video with the rotation attribute set. If the video is too big to be played on the TV (for example 1920x1080 vertical video on 1080p TV), Serviio will not transcode it, because it's reading the resolution as 1920x1080.

[Petr Nejedly]

Can you post ffmpeg -i for such a video?

[Giovanni Musto]

Here's the output:

ffmpeg version N-77710-g5b4da8a Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/home/rapperskull/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/rapperskull/ffmpeg_build/include --extra-ldflags=-L/home/rapperskull/ffmpeg_build/lib --bindir=/home/rapperskull/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. 12.100 / 55. 12.100
  libavcodec     57. 21.100 / 57. 21.100
  libavformat    57. 21.100 / 57. 21.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 23.100 /  6. 23.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20180904_204706.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2018-09-04 18:47:08
    com.android.version: 8.0.0
  Duration: 00:00:01.66, start: 0.000000, bitrate: 25270 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/bt470bg/smpte170m), 1920x1080, 23065 kb/s, SAR 1:1 DAR 16:9, 27.57 fps, 120 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2018-09-04 18:47:08
      handler_name    : VideoHandle
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
    Metadata:
      creation_time   : 2018-09-04 18:47:08
      handler_name    : SoundHandle
At least one output file must be specified

I only removed the location tag