[FFmpeg-trac] #9351(undetermined:new): bug in several windows builds when reencoding h.264 to h.265 with GPU

FFmpeg trac at avcodec.org
Thu Jul 29 04:39:45 EEST 2021

#9351: bug in several windows builds when reencoding h.264 to h.265 with GPU
             Reporter:  John Dury    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  ffmpeg gpu   |               Blocked By:
  buffer                             |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:
 How to reproduce:
 % ffmpeg -report -n -loglevel error -stats -hwaccel cuvid
 -hwaccel_output_format cuda -threads 2 -i test_H_264_AAC_1080p.mkv -c:s
 copy -c:a copy -map 0:a -map 0:s? -map 0:v -c:v hevc_nvenc -preset slow
 -qmax 20 hevc-test_H_264_AAC_1080p.mkv

 This happens on several windows builds but not all. I tested every windows
 build with the exception of the lgpl and gpl since licensing should be the
 only difference. This is true for both the gyan.dev and BtbN builds. I
 created logs for each test from each build. I used the exact same ffmpeg
 comands on different windows builds with the exact sam MKV test file. That
 file name is test_H_264_AAC_1080p.mkv and will be uploaded to the FTP with
 all of the logs from each build, successful and failed. I have tried this
 on two different machines with two different NVIDIA cards with no other
 GPU activity occurring simultaneously. The success/failures looks like
 Trying to connect to the ftp server but it keeps timing out. I will
 hopefully upload the sample MKV and it's logs soon.
Ticket URL: <https://trac.ffmpeg.org/ticket/9351>
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