[Libav-user] H.264 nal decode

srikanta mondal srkntmondal at gmail.com
Tue Apr 10 13:26:58 CEST 2012

Thanks all for reply. However I have got the H.264 compression using
libX264 from *
* and it is working fine for making video.

@NITIN GOYAL I have found in each nal frame contain the starting code 0 0 0
1. But still it is not working.

@Alex Cohn   I have omitted first 4 bytes and reduce the size. But still
avcodec_decode_video2() cann't decode the encoded array.

@Kalileo  Sorry I have not try H.264 compression with ffmpeg library and if
possible please give me some suggestion how can I do with ffmpeg library.
I have use     avcodec_decode_video2( m_pContext, picture, &gotpicture,
                    where AVCodecContext* m_pContext;
                             AVPacket *pkt = new AVPacket();
                             pkt->data = (heders[0].p_payload+4);
                             pkt->size = i_frame_size - 4;
                             int gotpicture;
                             AVFrame* picture = avcodec_alloc_frame();

I have fill up the parameters with these values and pass it to

Thanks and regards
Srikanta Mondal

On Tue, Apr 10, 2012 at 12:37 PM, Kalileo <kalileo at universalx.net> wrote:

> On Apr 10, 2012, at 13:19 , srikanta mondal wrote:
> > Thank you for reply.
> > @kalileo   I have simply got the UDP socket and get the byte array from
> it.
> you could also use the ffmpeg libraries to do that.
> > Now that byte array is basically the x264_nal_t*(p_payload[0]) from
> sender side.
> Is it? or is it in a container, such as mpegts? Then you should demux
> first.
> > That encoded byte array come to client side. Now I want to decode that
> array with its corresponding parameter values. I think it can be done by
> using avcodec_decode_video2().
> How are you passing that byte array to avcodec_decode_video2()?
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