[Matroska-devel] New Matroska field: Field Order

Steve Lhomme slhomme at matroska.org
Sun Oct 4 17:02:45 CEST 2015

2015-09-24 11:46 GMT+02:00 Jerome Martinez <jerome at mediaarea.net>:
> Le 23/09/2015 18:22, Steve Lhomme a ├ęcrit :
>> In the case of raw data, indepenedent of the Chroma Subsampling the
>> data can be interlaced. Normally it's 2 half pictures with the line of
>> one picture display, then a line of the other, etc. But in some cases
>> the interlacing can be a lot more complex.
>> We need a better way to describe these than the basic enabled flag that we
>> have:
>> http://matroska.org/technical/specs/index.html#FlagInterlaced
>> Some pictures formats use different techniques
>> https://en.wikipedia.org/wiki/Interlacing_%28bitmaps%29
>> Myabe having a (growing) list of techniques would be better than
>> describing all the possible ones with various fields and some math
>> formulas...
> Do we need to know in the Matroska container the complex interlacement if
> this one is already described in the compression format?


> I think this field is most useful for uncompressed content (so there is no
> information in the raw stream itself) so that we should focus on
> uncompressed format only.

Yes. Although if it exists, it's possible to write it even if not
needed. That can help to quickly find interlaced files you have in
your storage (for deletion).

> (and for the moment, I see only two methods: top or first field first).
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Steve Lhomme
Matroska association Chairman

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