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Re: [Bino-list] MOV Rotation tags being ignored?

From: Martin Lambers
Subject: Re: [Bino-list] MOV Rotation tags being ignored?
Date: Sun, 30 Sep 2012 18:48:41 +0200


On Sun, 30 Sep 2012 12:36:09 -0400, Peter Andrews wrote:
> I recorded two side by side portrait mode videos on two iPhones. The
> videos look fine and are oriented as expected in Quicktime player.
> Bino shows the videos rotated on their sides (i.e. landscape mode).
> Even though they already looked correct in Quicktime, I tried
> rotating the video but Bino did not change its display.
> My understanding is that quicktime videos have orientation bits such
> that when you rotate a video it only marks the orientation bit rather
> than re-encoding everything. Is it possible that Bino is not honoring
> the orientation bit in .mov files?

Yes, that is possible.

Bino uses FFmpeg to decode video data. Apparently, FFmpeg is able to
extract Apple's orientation bit; it is stored in a metadata tag named
"rotate". Bino should probably read that tag and rotate the video
accordingly (probably by manipulating texture coordinates when
displaying the video).

Is anyone interested in working on this? (I currently don't have the
time and I also don't have example data.)

Patches are welcome!


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