[FFmpeg-user] Intel QSV Transcoding Stops on Resolution Change

[Oliver Fromme]

Shane Warren wrote:
 > The -noautoscale seems to have fixed the stop/crash on resolution
 > changing. I can now hw decode using vaapi, then deinterlace/scale,
 > then qsv encode. I have a capture on an input stream that does all
 > kinds of horrible things (switches resolution and goes interlaced), I
 > have looped that many times and the output is stable.
 >
 > The autoscale/noautoscale option should be in the ffmpeg html
 > documents online somewhere, that option is very useful for anyone
 > transcoding live streams that change resolutions.

The option is already described in the documentation.
Quote:

   -autoscale
      Automatically scale the video according to the resolution of
      first frame.  Enabled by default, use -noautoscale to disable
      it.  When autoscale is disabled, all output frames of filter
      graph might not be in the same resolution and may be inadequate
      for some encoder/muxer.  Therefore, it is not recommended to
      disable it unless you really know what you are doing.  Disable
      autoscale at your own risk.

Actually I'm surprised that -noautoscale fixes your problem.
The default (-autoscale) should be the right one for streams that
change resolution.  Maybe there is a peculiarity with the QSV code
that requires -noautoscale.

Best regards
 -- Oliver