[Matroska-devel] Opus in Matroksa Cont.

Frank Galligan frankgalligan at gmail.com
Mon Jun 3 21:23:48 CEST 2013


I like CodecDelay better.


On Mon, Jun 3, 2013 at 12:01 PM, Steve Lhomme <slhomme at matroska.org> wrote:

> 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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>
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