The input file might not really have video frames at the rate it claims. 

Could you give full ffprobe output from your input video?
-Nick


On Tuesday, November 8, 2016 6:29 AM, Carl Eugen Hoyos <ceffm...@gmail.com> 
wrote:

>
>
>2016-11-08 12:28 GMT+01:00 Carl Eugen Hoyos <ceffm...@gmail.com>:
>
>>> ffmpeg -i movie.mkv -vf scale=-1:720 -c:v mpeg2video -q:a 0 -q:v 0 -maxrate 
>>> 38800k -preset veryslow -c:a copy -scodec copy test.mkv
>
>> Old MEncoder documentation suggests not to use -q:v 0 but instead
>> to use -q:v 2.
>
>And -vcodec mpeg2video -q:v 2 always needs -mbd 2
>
>
>Carl Eugen
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