Low bitrate for rare frames during transcoding

[vessd]

Thanks, I tried increasing the buffer and it fixed this case.
It looks like right now the buffer size is the bitrate x2, I increased it to x3 (-rc_mode VBR -b:v 4359887 -maxrate 4359887 -bufsize 13079661)

Before
   
File size: 970 KiB
Duration: 2 s 961 ms
Overall bit rate mode: Variable
Overall bit rate: 2 616 kb/s

After
   
File size: 1.66 MiB
Duration: 2 s 961 ms
Overall bit rate mode: Variable
Overall bit rate: 4 511 kb/s

In general, I did not notice an increase in resource consumption, only transcoded files began to take up a little more space.

Before

Code:

$ du -sh /media/transcoding
802M /media/transcoding

After

Code:

$ du -sh /media/transcoding
838M /media/transcoding

Should I look for a minimum buffer size that will fix this case? 

P.S. Code block formatting on this forum is a joke