[FFmpeg-user] How to produce mp4 and quicktime can read it.

[Psychesnet]

Hello guys, 

I found some clues about error 2401.
We need to fill extradata to ffmpeg, and quicktime would not appear the
error 2401.
But I would not calculate the 2 bytes, does anyone have ideal about this.

uint8_t extradata[] = { ??, ??};
AVCodecContextAudio->extradata = extradata;
AVCodecContextAudio->extradata_size = 2;

My audio is aac, 16kb/s, 1 channel, please help me, thanks a lot.

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