/* This code taken from get_rotation() in ffmpeg:cmdutils.c */
auto stream = _format_context->streams[*_video_stream];
auto rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);
/* This code taken from get_rotation() in ffmpeg:cmdutils.c */
auto stream = _format_context->streams[*_video_stream];
auto rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);