[FFmpeg-trac] #9464(avformat:new): support microsoft smooth streaming demux

[FFmpeg]

#9464: support microsoft smooth streaming demux
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             Reporter:  luckysk      |                     Type:
                                     |  sponsoring request
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  mss          |  master
  feature-request                    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 As the most shining star in multimedia, ffmpeg seems to lack support for
 MSS demux,some playready sources basically use MSS.  Does anyone have any
 relevant plans?

 In this website(http://playready.directtaps.net/smoothstreaming/), there
 are many MSS test  sources, such as the following non encrypted  sources:

 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_230.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_331.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_477.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_688.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_991.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_1427.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_2056.ismv
 http://playready.directtaps.net/smoothstreaming/SSWSS720H264/SuperSpeedway_720_2962.ismv

 Both VLC and GStreamer can play them well, but ffplay can't. I think both
 VLC and GStreamer have extended their own demuxer for MSS, while ffmpeg
 lacks an available demuxer.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9464>
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