[Live-devel] H264VideoRTPSource question

[Dong Liu]

Jeremy,

Thanks.

It works on some h264 sources but not on some other sources.

I came cross this message on the vlc list,

http://mailman.videolan.org/pipermail/vlc-devel/2005-July/018249.html

and a reply

http://mailman.videolan.org/pipermail/vlc-devel/2005-July/018262.html

It mentioned you need to to gather a whole frame before give it to ffmpeg 
decoder. Maybe I should take look at that.

BTW, the decoder I'm interested to use is the MPCVideoDecoder from mpc-hc 
project, it supports hardware acceleration but it also use ffmpeg code.

Thanks,

Dong

Jeremy Noring wrote:
> I've written something similar using FFDShow's decoder filter that works 
> fine, so it sounds like something in your directshow filter 
> implementation is wrong; I'd try the dshow newsgroups.
> 
>     Hi,
> 
>     I'm trying to write a Microsoft DirectShow source filter based on
>     live media's RTP implementation. For mpeg4 it works perfectly. But
>     for H264, the video is always jumpy. Sometimes with a lot artifacts.
>     I tried the source filter with Cyperlink's H264/avc decoder, 
>     mpc-hc's MPCVideo decoder and ffdshow's software decoder. All have
>     the same problem.
> 
>     What I did was according to Microsoft's documentation
> 
>     http://msdn.microsoft.com/en-us/library/dd757808(VS.85).aspx
>     <http://msdn.microsoft.com/en-us/library/dd757808%28VS.85%29.aspx>
> 
>     I created mediatype with 'AVC1' as the media type, and use the
>     sprop-parameter-sets from SDP as the the extra data form video
>     format. set dwFlags to 4.  Then call fSource->getNextFrame to get
>     the next NALU, in the callback function with the NALU, I put 4 bytes
>     length before it and pass them to the decoder.
> 
>     BTW, sources are from vlc and Haivision encoder. vlc play them
>     perfectly. And vlc is using livemedia as well :(
> 
>     Thanks,
> 
>     Dong
> 
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> 
> 
> 
> 
> -- 
> Where are we going?
> And why am I in this hand-basket?
> 
> 
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