[Mp4-tech] Fw: Regarding codecs supported by Mp4 file format

[Girish Shenoy]

Hi Gomathi,
My apologies!! You are right, there is no mention about the format of
decoderSpecificInfo for Mpeg 1/2 video.
Whether this container will be present for mpeg 1/2 video is not clear.
Hopefully, somebody with more knowledge on the subject will be able to
answer the question.
Regards,
Girish
-----Original Message-----
From: Gomathi R [mailto:rgomathi sarayusoftech.com]
Sent: Tuesday, October 17, 2023 10:48 AM
To: Girish Shenoy; mp4-tech lists.mpegif.org
Subject: Fw: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file
format
 ----- Original Message -----
From: "Gomathi R" <rgomathi sarayusoftech.com>
To: <girish dgbmicro.com>
Sent: Friday, October 13, 2023 5:27 PM
Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
> Hi Girish.
>
>    Ya,I too have the same 2001 version.

> In page number 44
>
> 1.first they are refering 14496-2(Mpeg-4 video) Annex-K for Mpeg-4 video
> 2.reference for Mpeg-4 Audio
> 3.Scene decription streams
> 4.mpeg-2 AAC
> 5.Mpeg-2 Audio layers I,II,III
> 6.finally jpeg it seems
>
> for mpeg 1/2 video where they gave.May be i would misunderstand.
> Please correct me if i'm wrong
>
> Thanks & Regards
> Gomathi.
>
> ----- Original Message -----
> From: <girish dgbmicro.com>
> To: "Gomathi R" <rgomathi sarayusoftech.com>
> Sent: Friday, October 13, 2023 4:43 PM
> Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
>
>
>>
>> That's strange. I am looking at it right now and I can see it and I am
>> looking at the 2001 version (the 2005 version must surely have it,
>> possibly in a different place). Are you sure you are looking at section
>> 8.6.7 (or whichever section that reads "DecoderSpecificInfo")?
>>
>> Regards,
>> Girish
>>
>>> Hi Girish,
>>>     I do referred that section but there is no reference for Mpeg 1/2
>>> video over there.
>>>
>>> Thanks & Regargs
>>> Gomathi
>>>   ----- Original Message -----
>>>   From: Girish Shenoy
>>>   To: Gomathi R
>>>   Sent: Friday, October 13, 2023 10:40 AM
>>>   Subject: RE: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file
>>> format
>>>
>>>
>>>   Hi Gomathi,
>>>
>>>   ObjectTypeIndication is the right place to look for the information
>>> you
>>> need. You've already hit the nail on the head.
>>>   But please be aware that the mdat need not necessarily be directly
>>> decodable without the help of other boxes in the file. Especially in the
>>> case where the file has more than one stream, the mdat may have data
>>> from both streams interleaved with each other.
>>>
>>>   Regards,
>>>   Girish
>>>
>>>   -----Original Message-----
>>>   From: mp4-tech-bounces lists.mpegif.org
>>> [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Gomathi R
>>>   Sent: Wednesday, October 11, 2023 9:01 AM
>>>   To: mp4-tech lists.mpegif.org
>>>   Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file
>>> format
>>>
>>>
>>>   Thanks a lot Liang.....
>>>
>>>   Actually I'm going to parse the .mp4 file and have to extract audio n
>>> video streams seperately to give as input to the corresponding
>>> decoders.ie.I'm going to write the code for Mp4 parser according to
>>> 14496-part 14.
>>>
>>>   so for example if the .mp4 contains mpeg-4 video i will read 0x20 as
>>> ObjectTypeIndication,then i ll extract the DecoderSpecificInfo as the
>>> header for .m4v file(as per 14496-2) and after that i will simply put
>>> the encoded samples from the "mdat" area.SO, if the codecs are
>>> predefined then i can study about their header info .If the case is like
>>> this how should i proceed....Please tell me some suggestions.......
>>>
>>>   Thanks & Regards
>>>   Gomathi.
>>>
>>>     ----- Original Message -----
>>>     From: Dickson Liang
>>>     To: Gomathi R
>>>     Sent: Tuesday, October 10, 2023 9:10 PM
>>>     Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file
>>> format
>>>
>>>
>>>     Hi,
>>>
>>>     MP4 is a file container. So in theory and in practical, you can put
>>> almost any kinds of MPEG-related codec inside this format. For
>>> example, you can put MPEG2 layer2 audio and MPEG4 H264 video into the
>>> same MP4 file. Just like a bag -- you can put any codec you like into
>>> the MP4 container.
>>>
>>>     Regards,
>>>
>>>     Dickson Liang
>>>
>>>     Gomathi R <rgomathi sarayusoftech.com> wrote:
>>>
>>>       ----- Original Message -----
>>>       From: Gomathi R
>>>       To: mp4-tech lists.mpegif.org
>>>       Sent: Tuesday, October 10, 2023 12:33 PM
>>>       Subject: Regarding codecs supported by Mp4 file format
>>>
>>>
>>>       Hi all...
>>>       I'm new to this group and this mail is regarding codecs supported
>>> by
>>> mp4 file format.
>>>       I've reffered ISO/IEC 14496-part 14(Mp4 - File Format) where they
>>> simply mentioned as AudioSampleEntry,VideoSampleEntry...but i want
>>> the actual codecs supported from standard reference......
>>>
>>>       Please help me out...
>>>
>>>       Thanks in Advance
>>>
>>>       Please reply ASAP......
>>>
>>>
>>>       Cheers,
>>>       Gomathi.
>>>       _______________________________________________
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>>>
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