[FFmpeg-devel] [PATCH] Add 'Presentation Y offset' metadata

tim nicholson nichot20 at yahoo.com
Mon Mar 30 13:09:40 CEST 2015

On 30/03/15 11:31, tomas.hardin at codemill.se wrote:
> On 2015-03-30 12:19, tim nicholson wrote:
>> Some software mis decodes IMX material in mxf if this metadata field is
>> missing. See the discussion on the ffmpeg ML:-
>> "[FFmpeg-user] How to set 3 specific metadata flags
>> (ITU601/displayoffset) in FFmpegs IMX50 MXF-OP1a encoding?"
>> This patch add this field to mxf wrapped material.
> Looks fine, but I know from experience that all this stuff gets tricky
> quickly. Like there should be mechanisms in lavf for dealing with
> presentation rectangles and all that jazz, including different aspect
> ratios at different layers.

Well I thought about adding the X offset too for completeness, but
currently due to the lack of the above mechanisms there didn't seem much
point as there was nothing to set it from......

(one use would be the 720/702 "blanking" which some systems also want,
but I can see no current programmatical way of setting it.)

> /Tomas
> [..]

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