[Libav-user] Is ffmpeg possibe to decode H.263 Mode B?

김희숙 hskim095 at naver.com
Mon Sep 10 09:28:13 CEST 2012


Thank you for your reply.

It's very helpful to me.




-----Original Message-----
From: "Arash Cordi"<arash.cordi at gmail.com> 
To: "This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter."<libav-user at ffmpeg.org>; 
Sent: 2012-09-07 (금) 16:06:33
Subject: Re: [Libav-user] Is ffmpeg possibe to decode H.263 Mode B?

normally h263 fragments are as follow:

start of frame --> [Mode A][Mode B] .... [Mode B] <---- end of frame

you only need the first byte of h263 payload header which is the same for all Mode A,B,C;

you need timestamp and marker bit (to identify start and end of frame) from rtp payload.

you also need to align fragments according to SBIT, EBIT in h263 payload header

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