[M4IF Technotes] total playback time of mp4

[Dave Singer]

>--- XiangHua Jin <xhjin   hf.tvia.com> wrote:
>>  Hello everyone:
>>
>>     Do you know how to calculate the total playback
>>  time of a mp4 file?
>>  Pls give a hint.

It's in the duration field of the moov atom in the file?
>  >
>>  Regards
>>
>>  --Xianghua
>>
>>
>>
>>  -----Original Message-----
>>  From: technotes-admin   lists.m4if.org
>>  [mailto:technotes-admin   lists.m4if.
>>  org] On Behalf Of Rob Koenen
>>  Sent: 2002«Ø6
Ó17¸ 13:31
>>  To: 'Ansari M N'; Rob Koenen; 'AVARO Olivier
>>  FTRD/DIH/REN';
>>  technotes   lists.m4if.org
>>  Subject: RE: [M4IF Technotes] Help wanted *****
>>
>>  Ansi,
>>
>>  We are (Olivier is) looking into the MPEG-4 Systems
>>  Bitstream issue.
>>
>>  > Got ur message and thanx or ur kind concern. The
>>  first
>>  > thing I did reg getting mpeg4 streams is, I
>>  visited
>>  > mwif.org. But there I found mpeg4 video or mpeg4
>>  audio
>>  > streams only and no mpeg4 system bitstream I could
>>  > find there.
>>
>>  I guess you mean m4if.org
>>  There are only links on m4if.org by the way, we don
>>  not
>>  host streams ourselves.
>>
>>  > Also I downloaded mppeg4 system decoder source
>>  code
>>  > from the same site. I managed to compile it
>>  > successfully. To run n check its performance I
>>  need a
>>  > mpeg4 sys file as its input.
>>  > I've downloaded some mp4 and mpg4 files from
>>  websites
>>  > Also I'm not sure abt its compliance with mpeg4.
>>  > The downloaded code doesnt accepts this input n
>>  gives
>>  > an error like "Invalid Url"
>>
>>  I do not know which source code you are referring
>>  to.
>>  We don't host any on our own site, as I mentioned
>>  Please be more precise.
>>
>>  mp4 files can be found, for instance, here
>>
>>  http://www.apple.com/mpeg4/
>>  http://www.envivio.com/solutions/etv/sample.jsp
>>  (If anyone knows of other mp4 files, let me know.
>>   We are making an overview of links to MP4 content
>>  for the
>>   Resources Page)
>>
>>  Rob
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>
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-- 
David Singer
Apple Computer/QuickTime