[Asterisk-video] How to play 3gp/mp4 file which was downloaded from internet?

[Liu Jianquan]

I download some 3gp and mp4 files from internet , and I use eyeBeam to see
if they can be played in Asterisk , here is my dialplan:

<asterisk-video at lists.digium.com>exten => 107,1,Answer
exten => 107,2,mp4play(/usr/videodemo/apple-ad-biohazard-suit.mp4)     ;
nothing happened,this file downloaded from internet
exten => 107,3,mp4play(/usr/videodemo/Kanye West - Love Lockdown.3gp)
;nothing happened.this file downloaded from internet

exten => 108,1,Answer
exten => 108,2,mp4play(/usr/videodemo/sample_300kbit_ulaw.3gp)    ; this is
OK.   It's demo file.

#mp4info /usr/videodemo/apple-ad-biohazard-suit.mp4

Track   Type    Info

1       video   MPEG-4 Simple @ L1, 173.960 secs, 0 kbps, 320x240 @
25.000000 fps
2       audio   MPEG-4 AAC LC, 173.987 secs, 0 kbps, 44100 Hz

#mp4info /usr/videodemo/Kanye West - Love Lockdown.3gp

Track   Type    Info

1       video   H.263, 272.080 secs, 140 kbps, 176x144 @ 25.000000 fps
2       audio   AMR, 271.480 secs, 13 kbps, 8000 Hz

#mp4info /usr/videodemo/sample_300kbit_ulaw.3gp

Track   Type    Info

1       audio   G.711 uLaw, 279.560 secs, 64 kbps, 8000 Hz

2       hint    Payload PCMU for track 1

3       video   H.263, 69.903 secs, 94 kbps, 176x144 @ 10.013876 fps

4       hint    Payload H263-2000 for track 3
 Metadata Tool: mp4creator 1.5.0.1

so I wonder what is hint?
btw, AMR has installed .

a lot of thanks.
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