[Libav-user] is possible to hack av_write_trailer to write moov atom at the beginning?

Anshul er.anshul.maheshwari at gmail.com
Thu Jul 11 09:39:37 CEST 2013

On 07/11/2013 12:50 PM, Wenbin Ma wrote:
> Hi,
> I want to use ffmpeg library to encode a h264 mp4 for http progressive 
> streaming. However ffmpeg added the moov atom at the end when calling 
> api: av_write_trailer. My basic idea is override the API: 
> av_write_trailer to write moove atom at the beginning. For example, I 
> have a 5 second video, the frame rate is 25, I have these basic 
> information of the encoded video here before I really add each frame 
> to an AVStream.  so is it possible write these information at the 
> beginning? Can you give me some clue about how to write this function?
> BTW, even I build ffmpeg with --enable-debug=3,  I still cannot debug 
> into ffmpeg code in Qt Creator, how do you debug ffmpeg code?
> Thanks,
> Wenbin
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please debug ffmpeg_g not ffmpeg


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