[FFmpeg-devel] [PATCH] Write Pixel Aspect Ratio tag to QuickTime files
Thu Jul 8 05:25:48 CEST 2010
On 7/7/10 7:36 PM, Jean-Daniel Dupas wrote:
> Le 8 juil. 2010 ? 04:22, Baptiste Coudurier a ?crit :
>> On 07/07/2010 07:12 PM, Daniel Kristjansson wrote:
>>> On Wed, 2010-07-07 at 14:35 -0700, Baptiste Coudurier wrote:
>>>> On 07/07/2010 02:17 PM, Daniel Kristjansson wrote:
>>>>> It's required in the spec, p118 of qtfs.pdf, "Pixel aspect ratio. This
>>>>> extension is mandatory for video formats that use non-square pixels."
>>>> My specs say MPEG-4 and uncompresed YCbCr. Dated 2007-09-04
>>> Mine is dated 2010-05-03.
>> Nice a new one :)
>> Unbelievable that they still refuses to document the 'ctts' atom ...
> This is the version with the QuickTime meta data format specification (keys/ilst atoms).
> FWIW, the ctts atom is fully documented in the MPEG-4 part12 specification [184.108.40.206] (except that they use signed offset despite what the spec says).
Yes, I know that. I was referring to their "signed" offset variant which
goes like you said, against ISO 14496-12. ISO will add that variant
using version 1 of the atom.
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