[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):

 Tried to reproduce the error.

     1. set up video server: using mediamtx :
 https://github.com/bluenviron/mediamtx
     2. push stream: ffmpeg -v verbose -re -stream_loop -1 -i input.mp4
 -c:v hevc_qsv -bsf:v extract_extradata=remove=1 -f rtsp
 rtsp://localhost:8554/mystream
     3. ffmpeg -v verbose -f rtsp -i rtsp://localhost:8554/mystream -f null
 - success
     4. ffmpeg -v verbose -hwaccel vaapi -f rtsp -i
 rtsp://localhost:8554/mystream -f null -  success after skip many frames
 (it relates to gop size)
     5. ffmpeg -v verbose -hwaccel qsv -f rtsp -i
 rtsp://localhost:8554/mystream -f null - fail ( error message

 {{{
 [hevc_qsv @ 0x559d42d69dd0] More data is required to decode header
     Last message repeated 3850 times
 }}}


 )

 "remove=1" means remove sps and pps from bitstream after extracting data.
 If i set remove=0 when push stream, qsv can successfully decode video
 stream.
 VPL may not be able to deal with stream without SPS and PPS, so it Keeps
 waiting for more data to decode header. I cannot reproduce the same error
 as reporter's.

 I suggest to use vaapi/d3d11va to decode video stream without SPS/PPS
 header as they use ffmpeg build-in parser to parse stream.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9766#comment:15>
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