Re: MediaStream ended vs inactive

On 06/17/2013 04:04 PM, Frederick.Hirsch@nokia.com wrote:
> Is there a privacy and/or security concern if the MediaStream has 
> ended and later is re-activated, perhaps a long time later, and 
> without user involvement? Does this enable video surveillance?

No. If we allow the media element to be "un-ended" by a stream becoming 
active, we allow video to play out, but you can't re-open a camera with 
this mechanism.

>
> (On a related note, should the spec say that inactive/ended is always 
> muted)
>
> Regarding Rob's suggestion, it seems to add complexity to have an 
> option here - perhaps the TF can decide whether it should be inactive 
> vs ended but not optionally both?
> Do we have any use cases for re-activation?
>
> regards, Frederick
>
> Frederick Hirsch
> Nokia
>
>
>
> On Jun 11, 2013, at 6:04 PM, ext Robert O'Callahan wrote:
>
>> On Wed, Jun 12, 2013 at 8:33 AM, Jim Barnett 
>> <Jim.Barnett@genesyslab.com <mailto:Jim.Barnett@genesyslab.com>> wrote:
>>
>>     Hmm, I thought we had agreed that MediaStreams can be
>>     reactivated.  If they can’t, then ‘ended’ is the right name for
>>     the attribute, and attempting to add a Track to an ended stream
>>     should raise an error.  I’m in favor of letting them be
>>     reactivated – I can’t see any reason not to do it.
>>
>>
>> I think it's helpful to have a permanent "ended" state. For example, 
>> an application might handle "ended" (or "inactive") the way Youtube 
>> does, and change state to display different UI. It's unexpected and 
>> confusing if the stream can suddenly revive again underneath, and 
>> would likely lead to application bugs.
>>
>> I propose doing roughly what the MediaStreams Processing proposal 
>> did: add an "auto-end" constructor parameter to MediaStream that 
>> defaults to true, so that the stream permanently ends as soon as 
>> there are no non-ended tracks and there was at least one non-ended 
>> track in the past. But authors can set the parameter to false to 
>> indicate that the stream should not automatically end just because 
>> there are no tracks.
>>
>> Rob
>> -- 
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>