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

[Gomathi R]

----- Original Message ----- 
From: Gomathi R 
To: Girish Shenoy 
Sent: Friday, October 13, 2023 2:39 PM
Subject: Re: [Mp4-tech] Fw: Regarding codecs supported by Mp4 file format
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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