[Matroska-devel] [proposal] add new element DefaultDeocdedFieldDuration

madshi madshi at gmail.com
Sat Dec 29 22:17:30 CET 2012


P.S: Should we maybe add a sentence that for true VFR content the field
should be omitted?


2012/12/29 madshi <madshi at gmail.com>

> Hey,
>
> > what I wanted to achieve is to have the word "frame" appear
> > for progressive content, because that's what a lot of people
> > usually will think about (and "interlaced" when they hear "field").
> > Therefore your proposal looks fine to me. So the full long
> > description would read as follows: [...]
>
> LGTM now, thanks.
>
> Best regards, Mathias.
>
>
> 2012/12/29 Moritz Bunkus <moritz at bunkus.org>
>
>> Hey,
>>
>> what I wanted to achieve is to have the word "frame" appear for
>> progressive content, because that's what a lot of people usually will
>> think about (and "interlaced" when they hear "field"). Therefore your
>> proposal looks fine to me. So the full long description would read as
>> follows:
>>
>> ------------------------------------------------------------
>> If the video sequence is signaled as interlaced, the period between
>> two successive fields at the output of the decoding process equals
>> DefaultDecodedFieldDuration. For video sequences signaled as
>> progressive, DefaultDecodedFieldDuration is half of the period between
>> two successive frames at the output of the decoding process.
>>
>> These values are valid at the end of the decoding process before
>> post-processing like deinterlacing or inverse telecine is applied.
>>
>> Examples:
>>
>> (1) Blu-Ray movie: 1000000000ns/(48/1.001) = 20854167ns
>> (2) PAL broadcast/DVD: 1000000000ns/(50/1.000) = 20000000ns
>> (3) N/ATSC broadcast: 1000000000ns/(60/1.001) = 16683333ns
>> (4) hard-telecined DVD: 1000000000ns/(60/1.001) = 16683333ns   (60
>> encoded interlaced fields per second)
>> (5) soft-telecined DVD: 1000000000ns/(60/1.001) = 16683333ns   (48
>> encoded interlaced fields per second, with "repeat_first_field = 1")
>> ------------------------------------------------------------
>>
>> Kind regards,
>> mosu
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>>
>
>
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