avcodec_close error

[jocker]

I use to compile the 32-bit version of ffmpeg visual studio 2012. I used the latter for now windows build from 5/29/13.
Here is my test code:

avcodec_register_all();

   int width = 764, height = 480;
   int got_output;
   AVFrame *frame;
   AVPacket pkt;
   AVCodec *codec;
    AVCodecContext *c = NULL;

   while(1)
   {
      frame = avcodec_alloc_frame();
      if (!frame) {
         fprintf(stderr, "Could not allocate video frame\n");
         return -1;
      }
      frame->format = AV_PIX_FMT_YUV420P;
      frame->width  = width;
      frame->height = height;

      /* the image can be allocated by any means and av_image_alloc() is
       * just the most convenient way if av_malloc() is to be used */
      int ret = av_image_alloc(frame->data, frame->linesize, width, height,
                      AV_PIX_FMT_YUV420P, 1);
      if (ret < 0) {
         fprintf(stderr, "Could not allocate raw picture buffer\n");
         av_freep(&frame->data[0]);
         avcodec_free_frame(&frame);
         return -1;
      }
   
      /* find the mpeg4 video encoder */
      codec = avcodec_find_encoder(AV_CODEC_ID_MPEG4);
      if (!codec) {
         fprintf(stderr, "Codec not found\n");
         return -1;
      }

      c = avcodec_alloc_context3(codec);
      if (!c) {
         fprintf(stderr, "Could not allocate video codec context\n");
         return -1;
      }

      /* put sample parameters */
      c->profile = FF_PROFILE_MPEG4_SIMPLE;
      /* resolution must be a multiple of two */
      c->width = width;
      c->height = height;
      /* frames per second */
      c->time_base.den = 25;
      c->time_base.num = 1;
      c->gop_size = 25; /* emit one intra frame every 25 frames */
      c->pix_fmt = AV_PIX_FMT_YUV420P;
      c->qmax = 4;
      c->qmin = 4;

      /* open it */
      if (avcodec_open2(c, codec, NULL) < 0) {
         fprintf(stderr, "Could not open codec\n");
         avcodec_close(c);
         av_free(c);
         return -1;
      }

      for(int k = 0; k < 30; k++)
      {
         av_init_packet(&pkt);
         pkt.data = NULL;    // packet data will be allocated by the encoder
         pkt.size = 0;

         frame->pts = c->frame_number;
  
         /* encode the image */
         if (avcodec_encode_video2(c, &pkt, frame, &got_output) < 0) {
            fprintf(stderr, "Error encoding frame\n");
            return -1;
         }
  
         if (got_output) {
            av_free_packet(&pkt);
         }
      }

      if(c)
      {
         avcodec_close(c);
         av_free(c);
      }
      if(frame)
      {
         av_freep(&frame->data[0]);
         avcodec_free_frame(&frame);
      }
   }

   return 0;

On the second call function avcodec_close () throws an exception. Such an error is detected on the MPEG4 codec with a frame width in the range 754-767 at an altitude of 480. Perhaps at other resolutions, too. Help solve the problem.

[Carl Eugen Hoyos]

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