[Matroska-devel] Opus in Matroksa Cont.

Steve Lhomme slhomme at matroska.org
Mon Jun 3 21:01:59 CEST 2013


Ok, I thought the PreSkip was sufficient for pre-roll. How about CodecDelay
instead of PreSkip? Since it doesn't much to do with skipping.
On Jun 3, 2013 8:51 PM, "Frank Galligan" <frankgalligan at gmail.com> wrote:

> 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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>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>> --
>>>> Steve Lhomme
>>>> Matroska association Chairman
>>>>
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>>
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>
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