Quicktime reference files - re-wrap - fps off

[Selur]

tbn = the time base in AVStream that has come from the container
tbc = the time base in AVCodecContext for the codec used for a particular stream
tbr = tbr is guessed from the video stream and is the value users want to see when they look for the video frame rate

source: http://www.ffmpeg-archive.org/What-does-...41538.html

Before you mentioned:

The input file is 25fps, but my output file is 26.40fps,...

but:

25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

would indicate that the output si 25fps not 26.4fps.
-> confused.

That aside you can set the tbn value for mov and mp4 files with 'video_track_timescale', so adding '-video_track_timescale 2500' might help. (hoping that this hasn't changed since the last time I used it )

Cu Selur