Hi,
The problem I have is that I am trying to obtain the audio stream from a set of
videos. I am using the following function to decode an audio packet:
int Video::getAudioPacket(short*& audio_out)
{
AVPacket packet;
//read into the video looking for the next stream
while(av_read_frame(m_pFormatCtx, &packet)>=0)
{
//is this packet from the audio stream?
if(packet.stream_index == m_audioStream)
{
int outsize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int decoded = avcodec_decode_audio3(m_pACodecCtx, audio_out,
&outsize, &packet);
av_free_packet(&packet);
if(decoded < 0)
{
/* error */
printf("Error decoding the audio(return value: %d)\n", decoded);
continue;
}
//obtain the number of samples from the number of decoded bytes
outsize /= sizeof(short);
av_free_packet(&packet);
return(outsize);
}
av_free_packet(&packet);
}
//at the end of the file we do not read anything
return(0);
}
I have two problems:
1) In some videos I am getting the right data, but in others I just get 0'os.
The videos I am getting 0'os for have been edited using other editing tools,
but ffmpeg does not crash when decoding them, nor complaints (except for an
initial message "[mp2 @ 0x10302de00]Header missing" which I am not sure whether
I have to ignore or not).If I try running ffmpeg in command line to extract the
audio it DOES decode these videos and I do get non-zero oputputs.
What am I doing wrong?
2) It looks like I must be iteratively reading the same data over and over, as
the output on the videos that have non-zero outputs is repeated many times.
What should I include to avoid doing it?
Thanks for your help
Xavier Anguera
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