[FFmpeg-devel] Microsoft Smooth Streaming

Marcus Nascimento marcus.cps at gmail.com
Wed Oct 26 22:20:03 CEST 2011

Hi there,

I was mistaken about which demuxer parses ISOFF. Seems to be the MOV
demuxer, not the ISOM.


On Tue, Oct 25, 2011 at 3:41 PM, Marcus Nascimento <marcus.cps at gmail.com>wrote:

> Greetings,
> I'd like to extend FFMpeg to support Microsoft Smooth Streaming (streaming
> playback), the same way it has been done by all the available Silverlight
> players.
> By now I do not intend to dump data to a file to be played locally or
> anything like that. And probably will never intend to do that. I just want
> to play it.
> I did some research in this mail list and find out some posts that talked
> about that before.
> However I couldn't find in depth information or anything beyond the point
> I'm stuck.
> I've done a lot of research on MS Smooth Streaming theory of operation,
> studied some ISOFF (and PIFF) and some more.
> It is pretty clear to me how MS Smooth Streaming works. Now it is time to
> focus on how to do that in the FFMpeg way.
> First things first, I'd like to know how a streaming should be processed in
> order to be played by FFMpeg.
> I see two possible scenarios:
> 1 - An external code make all HTTP requests to obtain the manifest XML
> file, use that to configure the decoder. Then makes further HTTP requests to
> obtain fragments that will be parsed by the demuxer (probably a custom one
> based on the ISOM already available).
> 2 - A very simple external code just request FFMpeg to play a smooth
> streaming media. FFMpeg will detect this is a HTTP based media and will
> request the manifest file for that (I believe I'd have to create a custom
> HTTP based solution for that). By the time the manifest is available, ffmpeg
> would configure the decoder. Then makes further HTTP requests same way as in
> 1.
> Which one fits better in the FFMpeg structure?
> If anyone can point me a starting point to dig into the code or give me
> some tips or that, I'd be really thankful.
> Thanks very much for your time.
> --
> Marcus Nascimento

Marcus Nascimento

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