[FFmpeg-trac] #3651(avcodec:reopened): UT Video Codec is inefficient compared to libutvideo

FFmpeg trac at avcodec.org
Sat Jan 7 19:56:21 EET 2017

#3651: UT Video Codec is inefficient compared to libutvideo
             Reporter:  Zerowalker   |                    Owner:
                 Type:  enhancement  |                   Status:  reopened
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  utvideo      |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |

Comment (by Cigaes):

 So I guess you are looking at the "real" time instead of the "user" time.
 The "user" time is usually more relevant; differences in "real" time may
 mean other processes getting scheduled or slow input from disk.

 Still, let us assume it is not the case here. We can compute the
 efficiency. For libutvideo: 40.982 user for 11.342 real means 361% CPU
 use; for the native decoder, 69.011 user for 9.651 real means 715% CPU

 361% versus 715% looks like ~90% of respectively 4 and 8 threads. Would
 this be a quad-code hyper-threaded system?

 Anyway, the native decoder is still not on par with the library, this bug
 cannot be closed.

Ticket URL: <https://trac.ffmpeg.org/ticket/3651#comment:32>
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