[FFmpeg-user] Write audio frames without decoding/encoding

[killkenny64]

Andrey Utkin wrote
> 
> Yes. Shortly, you can av_write_frame() the AVPacket you've just got
> from av_read_frame().
> 


I'm trying to write the audio packet into the new file

while(av_read_frame(inputFormatCtx, &packet) >= 0)
    {
        if(packet.stream_index == videoStream)  //videoStream = 0
        {
            //do some stuff and write it
            return;
        }
        if(packet.stream_index == audioStream) //audioStream = 1
        {
            av_interleaved_write_frame(outputFormatCtx, &packet);  //  
<----- crashes here
            av_free_packet(&packet);
            return 0;
        }
    }

But this crashes on the line:
         av_interleaved_write_frame(outputFormatCtx, &packet);

Why is this crashing?
If I ignore audio, I can make a .mp4 with just video and it works perfectly.
Am I doing something obviously wrong here?
For what reasons would av_interleaved_write_frame crash?

Thanks for your help

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