[opendtv] Re: Tech Dirt: Nielsen Finally Realizes That TV Viewers Are
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 13 Jun 2013 08:58:15 -0400
On Jun 12, 2013, at 5:22 PM, "Manfredi, Albert E"
<albert.e.manfredi@xxxxxxxxxx> wrote:
> Craig Birkmaier wrote:
>
>> Exactly. If a device cannot support Flash another protocol will be
>> used to deliver the h.264 version.
>
> Let me try to be clearer on my response to this.
>
> Flash is ALREADY an "H.264 version." Has been for many years now.
>
This is an option. It is NOT the default. Adobe has announced that it will move
to HTML5, which means they will move away from RTMP and their proprietary codec.
> So the comment should be, "If a device cannot support Flash, another protocol
> *may* be available at the server, to deliver some other variant of that
> stream. If an alternative stream is available and compatible with a player in
> the device, then the device will be able to decode the stream."
>
> This "other protocol" offered by server may very well **also** use H.264
> compression, JUST LIKE the Flash stream does.
Essentially correct. The reality is that most servers now host multiple
versions of video files, encoded for delivery at various bit rates. HLS takes
advantage of this, often pulling GOPs from different versions when bandwidth
spikes or ebbs. RTMP is less flexible, and therefore less used today. And since
iOS still dominates actual Internet usage, the HLS/h.264 approach is becoming
dominant as even Adobe moves away from proprietary "Flash streaming."
Regards
Craig
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