how to determine whether a h264 mp4 video is vfr or not ?

[adrianmak]

i ve a h264 mp4 video and want to re-encode in xvid

the mp3 playback duration is 23:54

i use avs directshow to read the mp4 for encode

however the output avi time duration is not match with the mp4
such that the audio & video is not in sync

I suspected it maybe a vfr video content but I don't ve any evidence.

Any tools to check whether it is a vfr mp4 content ?

[Southstorm]

MediaInfo: http://mediainfo.sourceforge.net/en

[adrianmak]

I used mediainfo to check my mp4.
how to know it is a vfr content

under the first video stream, the fps shown as 24.410

a strange fps i ever seen

a screen cap of mediainfo
http://i108.photobucket.com/albums/n16/adrianmak/Snap1-165.jpg

[Placio74]

Change View to Text mode for more informations.
Then, probably You can see Minimum frame rate and Maximum frame rate.