Media Pipeline Task Force Teleconference

05 Apr 2012


See also: IRC log


Kazuyuki_Ashimura, Giuseppe_Pascale, Clarke_Stevens, John_Simmons, Niklas_Schm├╝cker, Bryan_Sullivan, Glenn_Adams, Joe_Steele, Aaron_Colwell, David_Corvoysier, Mark_Watson, Jan_Lindquist, Dave_Mays, Russell_Berkoff, Franck_Denoual, Paul_Gausman, Jason_Lewis, Kevin_Streeter, David_Mays, Juhani_Huttunen, SungOk_You, +1.425.269.aabb, ??P63, ??P25, +1.858.735.aagg, +1.360.367.aahh


ABR proposal

clarke states we will review what was not complete last week, open bugs and open issues in bugzilla

if there is time discuss what the group wants to do

going forward

from last week what is left to do

is to put the requirements into a real draft

still open

clarke to contact david singer to check if adaptive streaming is disadvantaged

need some more time to give david more time to respond

next item is discussion over requirment 10

error reporting

additional errors to feed back

ads and splicing

using another video element

need for a use case to handle position timeframe

<KevinStreeter> It should be possible to seamlessly splice content with a discontinuous timeline (such as advertising) into the presentation [this requirement may conflict with (2)?]

this req may conflict with req 2

continous timeline is required

lets have some more discussion

need a common time reference

Aaron pointed out that use cases that are overlapping should be considered and timeshift

need to be considered to properly support the use case

need to keep a buffer to handle trickplay

need a master timeline to insert ads into

possibly need to adjust or map to the master timeline

may need to expose a timestamp offsetting to the API

2 is indep requirement

it is fully addressed by the proposal

11 is an additional requirement

any thing else on the abr requirements?

between here and next week clarke to add clarification before sending req to html5


next subject is bugs

<kaz> Bugs section

profile group has decided to use bugzilla to handle issues raised to the task force

bug 13625

<scribe> In process. Hixie needs to read provided materials.

bug 12399

<scribe> In process. Should this be generalized beyond video? Maybe start with video and consider a broader scope in any solution.

bug 13359

<scribe> In process. Discussions on parameters and whether changes are necessary. "Must be human readable" requirement.

bugs 13357 and 14492 have not been address since filed

2 new bugs

david: bugs came from discussions in profiling TF

bug 16479

<giuseppe> https://www.w3.org/Bugs/Public/show_bug.cgi?id=16479

<David_Corvoysier> https://www.w3.org/Bugs/Public/show_bug.cgi?id=16479

bug relates not being able to piping multiple streams

<joesteele> +q

nothing is stated as to how resources are freed

what webkit does the resource are not released when video tag is unloaded

only when garbage collection actually removes the resources

joe points that decryption resources are not released

david: video decoder has been the main issue

aeren: what is issue, if opening multiple videos

some content depending on decryption may require hardware

which is locked

there are 2 errors, if there are policy concerns and there should be a warning if software is going to be used as fallback

many audio tracks may be opened at the same time in order to give special effects which may confuse what should be handled

david: when listening audio may be persisted

when should resources be released

javascript may remove tag from dom and reinsert it

same media element may be used when transferring it

david: may some use cases are required

gius: add the use cases into the bug

next bug


when needing to have broadcast channel where there is a mosaic of the channels

may want an interface to select one of the channels

need to draw borders in order to select channel or everything is done in javascript

map element would be a much easier solution to be used but it is not available for the video element

only images

<bryan> is there anyway to use SVG as an scalable overlay frame, and trigger events from it?

for each of the elements need to put the source to handle the multiple stream types

<bryan> just a random idea

wiht map you can associated anchors

gius: investigate if there are better solutions

bryan: there might be markup language like svg that can help in providing a solution

giuseppe to explain how bugzilla to be used

bugzilla to be used to collect issues

and it is a better way to monitor questions and share with other groups

it is a prefilter of the raised issues

if agreed then it is pushed into the different WG's

there is a template for filling out issues

it is in the main wiki webpage

<giuseppe> http://www.w3.org/2011/webtv/wiki/Main_Page#Template_for_Use_Cases

use template to describe use case

clarke: what could be useful to add the template to the mptf as a reference
... once the discussion is started it is necessary to highlight to clarke to be discussed
... person who filed bug has responsibility to highlight it
... general discussion
... in next couple of week finishup the requirements documents
... use time every week to discuss opened bugs
... soon to limit the number of phone conferences
... if any suggestions forward them to clarke as to how to progress

move to phone conf every 2 weeks

adhock would make it harder to plan attending

<bryan> I like the building of the agenda on the wiki. It's easy to keep up as the topics for discussion are collected.

clarke: plan to continue phone conf every week until req done

joe to be scribe next week

<bryan> That approach can help make the calls more adhoc but keep people engaged on the agenda as it builds.

could use wiki agenda to identify critical mass of issues to be discussed

<kaz> [ adjourned ]

Summary of Action Items

[End of minutes]

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$Date: 2012/04/05 15:52:45 $