On Fri, Dec 4, 2015 at 6:59 PM Emmanuel Oga <emmanuel...@gmail.com> wrote:
> Hello,
>
> I'm investigating creating video on the fly but I have no experience
> producing video and I found about MLT by googling.
>
> Say I have some means to write to a bitmap surface, for instance using
> cairo to write text or geometric primitives to it. I'd like to take that
> surface and stream it on the fly through HTTP so it can be viewed with
> using a browser's <VIDEO> tag.
>
> * Is MLT well suited for doing something like that?
>
Maybe the only thing that MLT has right now that supports like drawing on a
canvas is WebVfx:
http://www.mltframework.org/bin/view/MLT/WebVfx
Otherwise, you can make a new producer. But, HTML5 css, canvas, svg, webgl,
and javascript do go a long way.
Yes, you can encode and stream that real-time, but do not rely upon any
CSS3 animation and stick to JavaScript.
> * If no, any suggestion on how to tackle this task?
> * If yes, would this be a CPU and/or memory demanding task? (i.e., can I
> expect to get good performance with such task when creating more than one
> stream at the same time with a reasonably fast computer).
>
>
Yes, absolutely! Any live encoding is going to be demanding. If the stream
is personalize per user (they each get their own canvas), then you need to
plan for a computer per user. The other thing you need to think about is
how to even do live streaming with the <video> element, which is not very
common and implemented uniformly. Most momentum is around MPEG-DASH using
dash.js and Media Streaming Extensions, but you might also need HLS for
Apple devices including desktop Safari. And you need to think about having
a Flash fallback and multiple bitrates. If all users see the same stream,
you might want to send a single live stream via RTMP to a video platform
provider such a zencoder or YouTube, and let them handle it.
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