[FFmpeg-trac] #2591(avcodec:open): Feature Request: Add ability to use Quick Sync to transcode video files

[FFmpeg]

#2591: Feature Request:  Add ability to use Quick Sync to transcode video files
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             Reporter:  zjacobs      |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  h264 vaapi   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:5 zjacobs]:
 > > > http://www.anandtech.com/show/5771/the-intel-ivy-bridge-core-i7
 -3770k-review/21
 > >
 > > I did not find any comparison between x264 and QuickSync in this
 article. Did I miss it?
 > >
 > They used x264 in their handbrake test:  "We took the profile and
 performed the same transcode, the result is listed above as the Core i7
 3770K (Handbrake). You will notice that the Handbrake x86/x264 path is
 definitely faster than Cyberlink's software path, by over 50% to be exact.
 However even using Handbrake as a reference, Quick Sync transcodes over 2x
 faster."

 This is missing the clarification that they actually tested with ultrafast
 and superfast (and possibly some finer presets in-between to test how
 quality compares at the exact same speed), but please understand that I
 did not want to move the discussion here (I very rarely encode to h264 and
 have honestly no opinion on this matter), I just wanted to warn you that
 more educated people on this matter than I am think that once this is
 implemented you will be very disappointed with the results.
 Otoh, if you need to use your CPU while re-encoding, hardware encoding may
 have its values (if you don't care about the encoding quality).

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2591#comment:6>
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