[FFmpeg-devel] [PATCH] Extract rotation in MOV metadata

[Dave Badia]

Hi Baptiste -

On Tue, Apr 5, 2011 at 7:53 PM, Baptiste Coudurier
<baptiste.coudurier at gmail.com> wrote:
>
> Set the metadata on AVStream, not AVFormatContext.
>
> Are you sure that the check is 100% correct for the rotation ?
>
> --
> Baptiste COUDURIER
> Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
> FFmpeg maintainer                                  http://www.ffmpeg.org
>

Ok, new patch with metadata set on AVStream.  I'm quite sure the logic
is correct as I have a couple of different samples from my iphone 4.
I used dumpster to look at the raw matrix then integrated the code
into ffmpeg and tested it in mythtv.

Interrogate MOV metadata for orientation of video so that software can
determine if the video needs to be rotated.

Thanks
Dave

---
 libavformat/mov.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 23ba1d4..8745d60 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1907,6 +1907,10 @@ static int mov_read_tkhd(MOVContext *c,
AVIOContext *pb, MOVAtom atom)
     sc->width = width >> 16;
     sc->height = height >> 16;

+    if (display_matrix[0][0] == -65536 && display_matrix[1][1] == -65536) {
+         av_metadata_set2(&st->metadata, "rotate", "180", 0);
+    }
+
     // transform the display width/height according to the matrix
     // skip this if the display matrix is the default identity matrix
     // or if it is rotating the picture, ex iPhone 3GS