[FFmpeg-devel] [PATCH] mov: support for Quicktime CLEF/TAPT atoms

Michael Niedermayer michaelni at gmx.at
Mon Jul 2 20:38:39 CEST 2012


On Thu, Jun 28, 2012 at 10:35:23AM +0200, Bram Senders wrote:
> Hi,
> FFmpeg does not currently support the Quicktime CLEF (Track Clean
> Aperture Dimensions) and TAPT (Track Aperture Mode Dimensions) atoms.
> (See https://developer.apple.com/library/mac/#documentation/QuickTime/QTFF/QTFFChap2/qtff2.html)
> These atoms are necessary for detecting the correct dimensions for
> some videos, since they take precedence in Quicktime over the normal
> TKHD (track header) width/height and over the track PASP (pixel aspect
> ratio).
> The attached patch adds support for these atoms. Sample videos can be
> found at https://ffmpeg.org/trac/ffmpeg/ticket/1485.

This patch worsens the aspect ratio of the sample from:

the center circle looks more round before this patch than afterwards


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato
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