[Icecast-dev] Adding a data in Live OR Saving Stream on Server side.

[Narendra Sisodiya]

On Tue, Sep 20, 2011 at 10:17 PM, Odin <odin.omdal at gmail.com> wrote:
> On Tue, Sep 20, 2011 at 3:33 PM, Narendra Sisodiya
> <narendra at narendrasisodiya.com> wrote:
>> What data I want to add ?
>> basically on my website there are various images. each image having  a
>> number. While I deliver my lecture I want to send image number too.
>> Now I can send this number using http PUSH/PULL but I do not know How
>> it will be synchronised ? Because AFAIK in streaming mode the HTML5
>> video element do not have TOTAL LENGTH parameter.
>> So Hom I can embed the image number in stream itself and get this data
>> on client side browser ?
>
> Hey Narendra.
>
> We've spoken before because we're working on basically the same thing.
>
> Now that you're trying to do live stuff, you've run into the same
> problems as me. There are currently no good way to sync slides and
> live streaming media in the web browsers today. However, based on a
> discussion we had in WHATWG, we added an element called
> startOffsetTime, which will make it possible once browsers implement
> it.
>
> However, I guess it'd be easier to fake syncronization with audio, as
> Icecast won't have to buffer as much of it, and normally the clients
> can get all the information quite quickly.
>
> You can just "guesstimate" how much the client is lagging behind the
> "real" feed, and then just add so many seconds delay to the serverside
> PUSH for a new image.
>
>
> Anyway, -- this isn't really much related to Icecast. Other than
> wanting to get down the buffering as low as possible, in order to have
> people seeing closer to the real, live stream, and not lag too far
> behind.
>


Thanks Again,
    I can think for another trick then..
== with video ==
in Video frames , we can use first 16 Pixel to encode slide number. We
can use CANVAS API to process individual frames (
https://developer.mozilla.org/En/HTML/Canvas/Pixel_manipulation_with_canvas
)
each 16 pixel can be 0 or 1 (black and white). We can generate
slidenumber at client side. I need to find a way where I can push
slide number information in pixel.

Let me redefine my question again.

I want to generate a video where I can modify pixel information of
each frame. kind of dynamic filter. So first 16 pixel Or may be just
first pixel will carry the info.

Also, I know that compression lossy so I do not know what will happen
to this trick

== With audio ==
Audio can be mixed/merged with a lossless video of 16x1 or 1x1
dimension. Trick can work successfully. I use ffmpeg to to audio
streaming with icecast. now I need to search for generating 1x1 video
frames.
Any suggestion?

-- 
┌─────────────────────────┐
│    Narendra Sisodiya
│    http://narendrasisodiya.com
└─────────────────────────┘