[Matroska-devel] Opus in Matroksa Cont.

Frank Galligan frankgalligan at gmail.com
Mon Jun 3 20:51:16 CEST 2013


The PreSkip is the number of encoded samples prepended to the encoded
stream by the encoder. Vorbis, AAC, Opus, MP3 all have PreSkip.


SeekPreRoll is amount of time needed to be decoded by the decoder before
the output is valid anywhere in the stream. Currently only Opus has a
SeekPreRoll (I think).


On Mon, Jun 3, 2013 at 11:20 AM, Steve Lhomme <slhomme at matroska.org> wrote:

> Now I am confused. I thought that was the feature we were already talking
> about. Can you explain the difference?
> On Jun 3, 2013 6:59 PM, "Frank Galligan" <frankgalligan at gmail.com> wrote:
>
>> Thanks. We also talked about adding a new element to TrackEntry to handle
>> the Seek pre-roll. Back in March we talked about adding SeekPreRoll as an
>> unsigned integer with a nanosecond resolution [1]. Everyone fine with
>> adding this to the spec?
>>
>> http://lists.matroska.org/pipermail/matroska-devel/2013-March/004418.html
>>
>>
>>
>>
>>
>> On Sun, Jun 2, 2013 at 9:51 AM, Steve Lhomme <slhomme at matroska.org>wrote:
>>
>>> I sent a pull request here.
>>>
>>> https://github.com/Matroska-Org/foundation-source/pull/1
>>>
>>> We can modify it before it's pushed to "master" and the specs on the
>>> website and the tools I generate based on the specs.
>>>
>>>
>>> On Wed, May 29, 2013 at 10:28 PM, Frank Galligan <
>>> frankgalligan at gmail.com> wrote:
>>>
>>>> Yeah,
>>>>
>>>> I know Opus can have the PreSkip end in the middle of an encoded Block.
>>>> I'm sure other codecs as well. Padding will always be in the middle of a
>>>> Block.
>>>>
>>>>
>>>>
>>>> On Wed, May 29, 2013 at 12:38 PM, Moritz Bunkus <moritz at bunkus.org>wrote:
>>>>
>>>>> Hey,
>>>>>
>>>>> no, we're talking about samples here, not whole blocks. Both for the
>>>>> PreSkip and PostPadding elements.
>>>>>
>>>>> Kind regards,
>>>>> mosu
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>>>
>>>
>>>
>>> --
>>> Steve Lhomme
>>> Matroska association Chairman
>>>
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>>
>>
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>
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