[FFmpeg-trac] #8780(avcodec:new): nvdec gives "No decoder surface left" error.

[FFmpeg]

#8780: nvdec gives "No decoder surface left" error.
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             Reporter:  haviet   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  unspecified
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug:

 My application (not ffmpeg.exe) uses nvdec to decode video streams
 receiving from IP cameras. Sometimes the error "No decoder surface left"
 occurs in unpredictable manner. I noticed the error via log files. I read
 the ticket #7562 but that ticket is different from my case that my app
 does not use any filter.


 How to reproduce:

 I could not reproduce the error in ffmpeg but I can reproduce the error by
 debugging my app in VS IDE. When the app runs normally I do like below:
 - Set a break point inside function "int
 ff_nvdec_start_frame(AVCodecContext *avctx, AVFrame *frame)".
 - Wait for some seconds.
 - Clear the break point and make the app continue running (F5).
 - Repeat above steps in several times then I should get the error.
 When the error occurs, flushing decoder does not help, but resetting
 decoder could mitigate the symptom.

 Snapshot of the break point
 https://ibb.co/vxvzW5S

 {{{
 ffmpeg source 4.3., 4.2., ...
 built on Windows 10 with nvdec enabled
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/8780>
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