Fw: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
Gomathi R
rgomathi sarayusoftech.com
Tue Oct 17 17:08:09 ESTEDT 2006
----- Original Message -----
From: "Gomathi R" <rgomathi sarayusoftech.com>
To: "Girish Shenoy" <girish dgbmicro.com>
Sent: Tuesday, October 17, 2023 12:06 PM
Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
> Hi Girish,
> Thank U so much for ur reply .If some experts in the mp4-tech list
> could give me the refence for Mpeg 1/2 video i'll be thankful.
>
> Also while referring mpeg-4 audio doc the AudioObjectType in
> AudioSpecificConfig contains CELP,HVXC,TwinVQ....etc..... should i need to
> support that also.if it is so CELP,TwinVQ are seperate coders to give them
> the DecoderSpecificInfo as header and encoded samples after
> that?.....Please clarify me.
>
> Thanks & Regards,
> Gomathi.
>
> ----- Original Message -----
> From: "Girish Shenoy" <girish dgbmicro.com>
> To: "Gomathi R" <rgomathi sarayusoftech.com>; <mp4-tech lists.mpegif.org>
> Sent: Tuesday, October 17, 2023 11:48 AM
> Subject: RE: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
>
>
>> 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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