[FFmpeg-trac] #4832(avcodec:new): Freeze when scaling and encoding h264_qsv

FFmpeg trac at avcodec.org
Sat Sep 5 19:22:22 CEST 2015

#4832: Freeze when scaling and encoding h264_qsv
             Reporter:  babgvant     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  Intel Quick  |  master
  Sync, h264_qsv                     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:

 At a seemingly random interval ffmpeg will freeze (become non-responsive
 and stop writing output to the console) at 12% CPU and constant RAM when
 -vf "scale... is specified. Process must be killed to continue.

 How to reproduce:
 % ffmpeg -c:v h264_qsv -i h264file.mkv -vf
 "scale=min(iw\,1280):trunc(ow/dar/2)*2:flags=fast_bilinear" -codec:v:0
 h264_qsv -codec:a:0 aac -strict experimental -ac 6 -ab 128000 -af
 "aresample=48000:async=1" -y "qsvout.mp4"

 ffmpeg version

 built on ...
 Unable to find a version that doesn't freeze

Ticket URL: <https://trac.ffmpeg.org/ticket/4832>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

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