[FFmpeg-trac] #9766(avcodec:new): h264_qsv decoder does not work with RTSP

[FFmpeg]

#9766: h264_qsv decoder does not work with RTSP
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             Reporter:  Steve Sampson  |                    Owner:  (none)
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  QSV RTSP       |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by wenbin,chen):

 According to
 https://spec.oneapi.io/onevpl/latest/API_ref/VPL_func_vid_decode.html#_CPPv431MFXVideoDECODE_DecodeFrameAsync10mfxSessionP12mfxBitstreamP16mfxFrameSurface1PP16mfxFrameSurface1P12mfxSyncPoint

 “Before decoding the first frame, a sequence header (sequence parameter
 set in H.264 or sequence header in MPEG-2 and VC-1) must be present. The
 function skips any bitstreams before it encounters the new sequence
 header”
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Ticket URL: <https://trac.ffmpeg.org/ticket/9766#comment:16>
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