FW: [M4IF Technotes] one simple question

[Dave Singer]

At 14:19 -0800 3/5/02, Rob Koenen wrote:
>Dave?

The standard actually does say this (all indexes start with 1) but 
we'll make it MUCH clearer in the amendment in progress.  So chunk 
numbers run from 1.
>-----Original Message-----
>From: Chandra Sekhar Reddy G [mailto:gchandra   tataelxsi.co.in]
>Sent: Thursday, January 31, 2024 20:04
>To: Wo Chang; technotes   lists.m4if.org
>Subject: Re: [M4IF Technotes] one simple question
>
>
>hi,
>
>i am also interested in an answer to this.
>
>the problem Wo talking about is for the observation.
>the problem i am talking about is for the material itself.
>
>in fact, there are many counters in (eg. sub-atoms in SampleTableAtom) MP4
>File Format,
>some start with '0' and some start with '1' (was it the way in QuickTime
>FileFormat also?).
>
>eg. in SampleToChunkAtom, in many MP4 files, the chunk numbers start with
>'1', some MP4 files start chunk numbers from '0'.
>that is the way the data is encoded in the table in SampleToChunkAtom.
>
>i have seen some mp4 files using counters starting from '0', some mp4 files
>starting from '1' for the same counters.
>
>Should the standard address this?
>
>Chandra
>
>
>
>----- Original Message -----
>From: Wo Chang <wchang   nist.gov>
>To: <technotes   lists.m4if.org>
>Sent: Friday, February 01, 2024 12:58 AM
>Subject: [M4IF Technotes] one simple question
>
>
>>  Dear All,
>>
>>  One simple question:
>>
>>  When counting frame in MPEG-1/-2/-4 video clip,
>>  do we (MPEG'ers) use "0" or "1" base when counting
>>  the very first frame?  I came across materials using
>>  "1" as the starting frame but that may not be the
>>  MPEG's convention.
>>
>>  The reason why I asked this is, let's say you have
>>  a group of collaborators reviewing shots.  We will
>>  need to establish what is the first frame called:
>>  frame 0 or frame 1, so that at a later time, if we
>>  say "look at frame 928", then we all will look at
>>  the exact frame.
>>
>>  I just want to know, how do MPEG'ers normally count
>>  the frame, do you count the very first frame as frame "0"
>>  or frame "1".
>>
>>  Thanks!
>>
>>  --Wo
>>
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-- 
David Singer
Apple Computer/QuickTime