The output of the log file [Just the final lines]
No, not just the final lines, they are useless. Please compress and attach the entire file resulting from building from the current git master (anything else is pointless because if a fix is required, it will go only into the git master).
No, i want "MPlayer Resize". here a screenshot using the "Avidemux 2.5.4" for Ubuntu Trusty. [...]
I guess it is the same, but can't verify. 2.5.x is a too distant past for me.
Because "swscale resize" is very slow, for example if i try resize a video with 2 hours of duration, with this, my hardware, needs 24 hours for do that. with "MPlayer Resize" i just need 8 hours. for make the same.
For sure, this difference originates from differing encoder or encoder options, not from the filter. You could tremendously speed up encoding by using NVENC hardware encoder (use the current git master for that). This requires a NVIDIA graphics card beginning with the Kepler generation and binary NVIDIA drivers installed and working.