[Libav-user] no frame error

[Hommel, Sebastian]

Hello,

I try to grab images from a H.264 video stream of an Axis camera with Visual Studio 2010 for a x64 machine.
I use the latest Version of ffmpeg.
If I use ffplay.exe the stream is well shown, but in my implementation I get the Error: "no frame!" from avcodec_decode_video2().
My code and the full error is shown below.

Your<http://www.dict.cc/englisch-deutsch/Your.html> help<http://www.dict.cc/englisch-deutsch/help.html> is<http://www.dict.cc/englisch-deutsch/is.html> greatly<http://www.dict.cc/englisch-deutsch/greatly.html> appreciated.<http://www.dict.cc/englisch-deutsch/appreciated..html>


#include "stdafx.h"
extern "C"
{
#include <libavformat\avformat.h>
#include <libavcodec\avcodec.h>
}

int _tmain(int argc, _TCHAR* argv[])
{
       AVFormatContext* ic = avformat_alloc_context();
       avcodec_register_all();
       avformat_network_init();
       av_register_all();


       AVPacket pkt1, *pkt = &pkt1;

       avformat_open_input(&ic, "rtsp://root:hallo2010@10.2.114.57/axis-media/media.amp", NULL, NULL);

       av_find_stream_info(ic);
       av_dump_format(ic, 0, ic->filename, false);

       AVCodecContext* enc = ic->streams[0]->codec;

       int video_index = -1;
       for(int i = 0; i < ic->nb_streams; i++)
       {
             enc = ic->streams[i]->codec;
             if(enc->codec_type == AVMEDIA_TYPE_VIDEO)
             {
                    video_index = i;
             }
       }

       int picture = 0;

       AVCodec* codec = avcodec_find_decoder(ic->streams[video_index]->codec->codec_id);
       enc = avcodec_alloc_context();
       if(codec->capabilities & CODEC_CAP_TRUNCATED)
         ic->streams[video_index]->codec->flags|=CODEC_FLAG_TRUNCATED;
       if (!codec ||
              avcodec_open(enc, codec) < 0)
       return -1;
       av_read_play(ic);

       AVFrame* frame;
       frame = avcodec_alloc_frame();
       av_init_packet(pkt);
       avcodec_flush_buffers(enc);

       uint8_t *buffer;
       int numBytes;
       enc->width = 1920;
       enc->height = 1080;

       // Determine required buffer size and allocate buffer
       numBytes=avpicture_get_size(PIX_FMT_RGB24, enc->width,
                            enc->height);
       buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
       avpicture_fill((AVPicture *)frame, buffer, PIX_FMT_RGB24,
                enc->width, enc->height);


       int i = 10;
       while(i>0)
       {
             i--;

             if(av_read_packet(ic, pkt)<0) break;
             if(pkt->stream_index==video_index)
             {
                    avcodec_decode_video2(enc, frame, &picture, pkt);
             }
             av_free_packet(pkt);
       }
       avcodec_close(enc);
       av_close_input_file(ic);
       return 0;
}

OUTPUT:
[udp @ 0000000000588fe0] 'circular_buffer_size' option was set but it is not sup
ported on this build (pthread support is required)
[udp @ 000000000058fbc0] 'circular_buffer_size' option was set but it is not sup
ported on this build (pthread support is required)
[rtsp @ 0000000000586fc0] Estimating duration from bitrate, this may be inaccura
te
Input #0, rtsp, from 'rtsp://root:hallo2010@10.2.114.57/axis-media/media.amp':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.120000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuvj420p, 1920x1080 [SAR 1:1 DAR 16:9],
25 tbr, 90k tbn, 180k tbc
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!
[h264 @ 00000000004a29a0] no frame!

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