Why the totoal duration Of MP3 is more than the right duration?

[gilnuy]

for example: the duration is 1:30:10 streammingkit return is 1:30:40.

how could i get the right duration? please help me,thank you!

[yinchengvy]

I have the same problem with you.

[tumtumtum]

The duration is calculated based upon the average bitrate of the file. Without reading the whole file (which defeats the purpose of seek-less streaming) it's not always possible to get a perfect approximation especially for VBR files.

In general, the error will tend towards 0 the longer you play the file (this means that the duration changes as the file is playing).

You could try increasing STK_MAX_COMPRESSED_PACKETS_FOR_BITRATE_CALCULATION. For MP3 files it may also be possible to read the length from the ID3 tags.

Cheers.

[yinchengvy]

Thx, I've tried it, but it does not work.

[yinchengvy]

I've modified like this, and it does work well.

-(double) calculatedBitRate
{
    double retval;

    if (packetDuration > 0.0)
    {
        if (processedPacketsCount > STK_BIT_RATE_ESTIMATION_MIN_PACKETS_PREFERRED || (audioStreamBasicDescription.mBytesPerFrame == 0 && processedPacketsCount > STK_BIT_RATE_ESTIMATION_MIN_PACKETS_MIN))
        {
            double averagePacketByteSize = (processedPacketsSizeTotal * 1.0) / processedPacketsCount;

            retval = averagePacketByteSize / packetDuration * 8;

            return retval;
        }
    }

    retval = (audioStreamBasicDescription.mBytesPerFrame * audioStreamBasicDescription.mSampleRate) * 8;

    return retval;
}

[tumtumtum]

Ahh, missed the int->double precision problem. Good catch. Fixed in HEAD.