Thanks,Maxim.
The problem is in the meta data of the mp4 file. Flash player need a
audio codec_tag_string .mp3 (0x2E6D7033) to indicate that the track
contains MP3 audio data. But the ffmpeg add mp4a (0x6D703461) as audio
audio codec_tag_string , and mp4a will indicate that the track contains
AAC audio data to flash player.

Sheng





On 2012/11/29 21:12, Maxim Dounin wrote:
> Hello!
>
> On Thu, Nov 29, 2012 at 11:27:40AM +0900, Sheng.Zheng wrote:
>
>> Hi,Maxim
>> Here is the sample file.
>> http://dl.dropbox.com/u/8837018/180379674-ff-fs.mp4
>
> This file plays without sound in flash player here even without
> nginx pseudostreaming enabled, so I would suppose it's not an
> nginx fault.
>
> (When playing with mplayer and/or Chrome directly I can hear sound
> on both unmodified file and with pseudostreaming, i.e. with
> "?start=228.915" added manually.)
>

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