[Asterisk-video] which codec that mp4play application can play?

[duong canh]

i have successful in setup mp4play application for asterisk. It play ok with
some sample mp4 file that i download from sip.fontventa.com, but it not work
with other mp4 file that i convert from avi  file. can someone tell me which
mp4 file that asterisk can play and how to get it.
  thanks
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