Re: Submitted HTML5 bugs and an MSE observation

On 3/17/14, 11:49 AM, "Clift, Graham" <Graham.Clift@am.sony.com> wrote:

>It seems like for TextTrack creation in MPEG-2 TS that detection of the
>metadata private section is only through the stream_type code present in
>the PMT and that the payload_start_indicator==1 is only relevant to
>populating the DataCues that get added to the TextTrack later.

Yes, youıre right - the payload_start_indicator should not be used to
determine metadata track; only the stream_type.

> Hence the patch and the wiki page seem incorrect to me when they suggest
>the payload_start_indicator==1 is used to detect that there is a stream
>type of kind metadata private section.
>
>This also raises another question which is how are the metadata private
>section table cues are generated. If the private section table is
>delivered as a payload split across multiple TS packets then presumably
>the UA must use the payload_start_indicator bit to begin to assemble the
>payload into the single private section table. However, when does the cue
>get created unless the UA knows how many packets to expect?

The private_section_length field can be used by the UA to know when itıs
received the last packet for an instance of the table.

> My understanding is the UA does not know how many packets to expect so
>maybe it generates the cue only when a subsequent
>payload_satart_indicator==1 is detected. However, this could be long past
>the time when this cue is relevant to the media playback time.
>
>Regards
>
>Graham Clift
>
>
>
>
>
>
>-----Original Message-----
>From: Silvia Pfeiffer [mailto:silviapfeiffer1@gmail.com]
>Sent: Monday, March 17, 2014 1:21 AM
>To: Bob Lund
>Cc: public-inbandtracks@w3.org
>Subject: Re: Submitted HTML5 bugs and an MSE observation
>
>On Fri, Mar 14, 2014 at 5:56 AM, Bob Lund <B.Lund@cablelabs.com> wrote:
>> Hi CG,
>>
>> I have submitted the following HTML5 bugs 24986, 24977, 25005 and
>> 25044, reflecting the discussion we've had on the mailing list.
>
>[HTML editor hat on:]
>I've provided feedback and proposed patches in each of these bugs.
>Please review.
>
>Regards,
>Silvia.
>
>
>

Received on Monday, 17 March 2014 19:04:47 UTC