I put a mp4 file in content folder for vod, but no video displayed (audio has no problem, and the audio and video of sample.mp4 have no problem). Here is the video and audio information of the file (by ffmpeg):

...
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 1444 kb/s, 29.98 fps, 29.98 tbr, 3747 tbn, 29.98 tbc (default)
Metadata:
...
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 11025 Hz, stereo, fltp, 37 kb/s (default)
...

Does wowza not support mp4v format, or I did something wrong? Thanks.