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RTP clarifications

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Originally committed as revision 9722 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Barbato 2007-07-17 14:15:39 +00:00
parent 0509d453b5
commit 241fb0c4ff
1 changed files with 6 additions and 10 deletions
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doc/faq.texi
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@ -406,10 +406,8 @@ The standard MSys bash (2.04) is broken. You need to install 2.05 or later.
@section I tried to pass RTP packets into a decoder, but it doesn't work.
Of course not, you MUST strip ALL RTP headers and assemble valid packets
first, an MP3 decoder decodes MP3 packets not bastardized MP3 packets
encapsulated in RTP. The same applies to all decoders, this is not specific
to ffmpeg or libavcodec.
RTP is a container format like any other, you must first depacketize the
codec frames/samples stored in RTP and then feed to the decoder.
@section Where can I find libav* headers for Pascal/Delphi?
@ -419,12 +417,10 @@ see @url{http://www.iversenit.dk/dev/ffmpeg-headers/}
see @url{http://svn.mplayerhq.hu/michael/trunk/docs/}
@section how do I feed H.263-RTP (and likely other RTP bastardizations of codecs) to libavcodec?
@section how do I feed H.263-RTP (and other codecs in rtp) to libavcodec?
Remove _ALL_ RTP trash and either feed the fragments through an AVParser and
then into the decoder or merge the fragments yourself into proper frames and
feed them into the decoder. Note: The payload of H.263-RTP is not valid
H.263 you at least have to merge the first and last bytes discarding RTP trash
from them, possibly more. Also look at rfc 4629.
Even if peculiar since it is network oriented, RTP is a container like any
other. You have to DEMUX RTP before feeding the payload to libavcodec.
In this specific case please look at rfc 4629 to see how it should be done.
@bye