[FFmpeg-user] 90k tbn vs 30k tbn

[Petr Tresnak]

Hello,
I am down-scaling 4K video into 1080p, result is ok, but with different:
- color info (bt709 vs Nothing)
- tbn (90k vs 30k)
- missing creation time (Metadata: creation_time   : 2014-11-02 14:18:12 vs Empty)

Input 4K video
   Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), 
yuvj420p(pc, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 95173 kb/s, 29.97 
fps, 29.97 tbr, 90k tbn, 59.9
   Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)
   Metadata: creation_time   : 2014-11-02 14:18:12

Output 1080p  
  
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc),
 1920x1080 [SAR 1:1 DAR 16:9], 21191 kb/s, 29.97 fps, 29.97 tbr, 30k 
tbn, 59.94 tbc (
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s (default)
   Metadata: creation_time   : 

What should I add to have both the same?
Thanks
Peter