Re: Re: Issue of Mpeg4 Audio (Newbe)
Re: Re: Issue of Mpeg4 Audio (Newbe)
- Subject: Re: Re: Issue of Mpeg4 Audio (Newbe)
- From: "ranjeet gupta" <email@hidden>
- Date: 6 Jul 2005 10:17:11 -0000
On Wed, 06 Jul 2005 Stephen Davis wrote :
>Ranjeet,
>> I have the issue on the m4a (Mpeg 4 Audio), The basic thing what
>> I have to do is that I have to read the m4a audio and play back,
>>
>> The First basic thing I did is that, I copied all the data into >>the
>> new file i.e abcd.m4a as the copy_abcd.m4a and then playing the
>> file into the foobar player, I observaed that the copied file
>> i.e copy_abcd.m4a is playing fine,
>>
>> Now what I have to do is I have to play the file by skipping
>> some amount of the data, (Forward Skipping)
>>
>> so i skipped some amount of data (Here I skipped in terms of bytes),
>> and then made the file again names as the skipped_abcd.m4a, Now when
>> I play this file into the foobar then i see that it says about the
>> error, that it cannot play,
>MPEG-4 files are highly structured so you can't just hand a random >set of bytes from such a file to a decoder and expect it to work.
yes, I came to know As i was going through the ISO/SC29 Refrence
Software Guide Version Is Dated 2000-08-08, For this I have been
given the source code for this, Is there any API present In this
Software guide which tells about how to skip the Audio of the
MP4 ?
>> Again searched for the soulution of this, I came to know that
>> and read the site, and worked accoreding to it,
>> http://www.dv.co.yu/mpgscript/mpeghdr.htm
>This document describes MPEG-1 audio data. The MPEG-4 file format >is drastically different than this format.
Thanks for giving your comment as I was also thinking the
same but was not sure.
>
>I would suggest looking for ISO document "ISO/IEC 14496-3:2001" and >its siblings and going from there.
I searched for the spec but it is payed one :-(
well I have ISO/SC29 Refrence Software guide so please do guide me
Thanks
Ranjeet
>stephen
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