Andreas Rheinhardt:
> The cases in which there was flipping together with a rotation
> that is not a multiple of the identity were wrong.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
> ---
> This whole patchset relies on the mismatch in av_display_rotation_set()
> being solved by keeping the current behaviour and updating the
> documentation.
> 
>  libavcodec/mjpegdec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
> index 8b154ce0ab..0dbbc14bae 100644
> --- a/libavcodec/mjpegdec.c
> +++ b/libavcodec/mjpegdec.c
> @@ -2896,14 +2896,14 @@ the_end:
>                      break;
>                  case 5:
>                      av_display_rotation_set(matrix, 90.0);
> -                    av_display_matrix_flip(matrix, 0, 1);
> +                    av_display_matrix_flip(matrix, 1, 0);
>                      break;
>                  case 6:
>                      av_display_rotation_set(matrix, 90.0);
>                      break;
>                  case 7:
>                      av_display_rotation_set(matrix, -90.0);
> -                    av_display_matrix_flip(matrix, 0, 1);
> +                    av_display_matrix_flip(matrix, 1, 0);
>                      break;
>                  case 8:
>                      av_display_rotation_set(matrix, -90.0);
> 

Will apply this patchset tonight unless there are objections.

- Andreas
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