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Thread: Demuxing H.264
Demuxing H.264
user name
 2007-04-03 15:01:48 
Hello!

With some help from the IRC channel, I managed to get my
MPEG-4
decoder to work with a demuxer. That is, "filesrc !
qtdemux !
mympeg4dec ! mysink" now works correctly, thanks to the
codec_data
being prepended to the first buffer.

However, that's not helping much with H.264 and am having a
hard time
with it. The problem is that my decoder chokes with the raw
data. I
digged into gstffmpeg's H.264 decoder and the codec_data
seems to be
information about NAL Units.

Is there any way to decode this information without
#including and
linking against libavcodec?

I noticed this was discussed in this mailing list a couple
of days
ago, but couldn't find the final resolution.

Thanks for any pointers. Greetings!

Daniel Díaz
yosoydanieldiaz.org

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Re: Demuxing H.264
user name
 2007-04-03 21:03:20 

  


  

    

Daniel_Díaz, Hello 


 


It sounds that you meet the same problem.



First, you need to parse codec_data, check file "h264.c" from 
gst-ffmpeg-0.10.2, the function "decode_frame" show you how to parse it.


Second, you should convert frame to nal unit, check file "media_export.c" 
from gpac-0.4.2, the function "gf_media_export_native" show you how to convert 
based pps, sps and unit size. ;


 



2007-04-04 



  
----- 
  Receiving the following content ----- 

  
From: 
   mrchappgmail.com">Daniel_Díaz 

  
  
Time: 
  2007-04-04, 04:01:48


  
Subject: 
  [gst-devel] Demuxing H.264

  


  

  

  

  
Hello!

With some help from the IRC channel, I managed to get my 
  MPEG-4
decoder to work with a demuxer. That is, "filesrc ! qtdemux 
  !
mympeg4dec ! mysink" now works correctly, thanks to the 
  codec_data
being prepended to the first buffer.

However, that's not 
  helping much with H.264 and am having a hard time
with it. The problem is 
  that my decoder chokes with the raw data. I
digged into gstffmpeg's H.264 
  decoder and the codec_data seems to be
information about NAL 
  Units.

Is there any way to decode this information without #including 
  and
linking against libavcodec?

I noticed this was discussed in this 
  mailing list a couple of days
ago, but couldn't find the final 
  resolution.

Thanks for any pointers. Greetings!

Daniel Díaz
danieldiaz.org">yosoydanieldiaz.org

-------------------------------------------------------------------------
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  Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's 
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  business topics through brief surveys-and earn cash
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  mailing list
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