Previous thread:
http://ffmpeg.org/pipermail/ffmpeg-devel/2019-July/246951.html
I added the modifications to the decoder, I ran some tests for performance
and run times are only affected if my flag is enabled.
Decoded 3 different encoded videos 20 times each with and without my debug
flag, here are the results:
*ExtractQP disabled:*
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug 0 -i tveryfast.mp4 -f null -
Mean Std.Dev. Min Median Max
real 0.747 0.007 0.735 0.749 0.756
user 5.582 0.025 5.547 5.574 5.627
sys 0.166 0.028 0.120 0.167 0.224
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug 0 -i tmedium.mp4 -f null -
Mean Std.Dev. Min Median Max
real 0.865 0.009 0.845 0.864 0.887
user 6.296 0.036 6.198 6.299 6.365
sys 0.195 0.026 0.142 0.199 0.247
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug 0 -i tveryslow.mp4 -f null -
Mean Std.Dev. Min Median Max
real 0.919 0.011 0.892 0.920 0.943
user 6.398 0.042 6.311 6.381 6.476
sys 0.229 0.032 0.169 0.238 0.287
*ExtractQP enabled: *
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug extractqp -i tveryfast.mp4 -f
null -
Mean Std.Dev. Min Median Max
real 1.126 0.032 1.076 1.132 1.216
user 6.433 0.054 6.347 6.430 6.561
sys 1.069 0.047 0.989 1.063 1.161
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug extractqp -i tmedium.mp4 -f
null -
Mean Std.Dev. Min Median Max
real 1.178 0.020 1.143 1.176 1.217
user 7.091 0.055 7.020 7.081 7.196
sys 1.031 0.057 0.898 1.043 1.131
===> multitime results
1: ffmpeg -hide_banner -loglevel panic -debug extractqp -i tveryslow.mp4 -f
null -
Mean Std.Dev. Min Median Max
real 1.234 0.028 1.196 1.230 1.322
user 7.212 0.077 6.996 7.230 7.345
sys 1.067 0.076 0.938 1.062 1.283
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