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• Encoding video using FFmpeg and FreeImage

  14 mai 2014, par mike

  I have to make a video encoder to encode video using mjpeg codec from many jpgs saved on the disk. I use FreeImage to load images and ffmpeg to encode. Unfortunately, the output video isn’t that what I expect. I can’t play it in MPC. VLC can play it but there is only a single quick flash of the last picture I loaded. I want to have 1 fps video and for example I loaded 4 frames so my video should last 4 seconds.

  Input pictures are in BGR24 pixel format.

  What is more, when I run my code I got swscaler warning that picture format YUVJ420P is deprecated but I cant find another pixel format which is suitable for MJPEG codec.

  Here is my source code :

  AVPixelFormat in_pix_fmt = AV_PIX_FMT_BGR24;
  
  AVPixelFormat out_pix_fmt = AV_PIX_FMT_YUVJ420P;
  
  
  
  AVCodec *pCodec;
  
  AVCodecContext *pCodecCtx = NULL;
  
  int out_size = 0;
  
  int size, outbuf_size, i, outpic_size, w, h;
  
  FILE *file;
  
  const char *videofile_name = "test_video_cpp.avi";
  
  AVFrame *picture, *outpic;
  
  uint8_t *outbuf, *picture_buf, *outpic_buf;
  
  
  
  av_register_all();
  
  
  
  pCodec = avcodec_find_encoder(CODEC_ID_MJPEG);
  
  if (!pCodec)
  
  {
  
      cout << "Codec not found\n\n";
  
      return 1;
  
  }
  
  
  
  pCodecCtx = avcodec_alloc_context3(pCodec);
  
  picture = avcodec_alloc_frame();
  
  outpic = avcodec_alloc_frame();
  
  
  
  pCodecCtx->codec_id = CODEC_ID_MJPEG;
  
  pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  pCodecCtx->pix_fmt = out_pix_fmt;
  
  pCodecCtx->bit_rate = 400000;
  
  pCodecCtx->width = 1688;            
  
  pCodecCtx->height = 728;
  
  pCodecCtx->time_base.num = 1;           
  
  pCodecCtx->time_base.den = 1;       //fps
  
  pCodecCtx->max_b_frames = 0;
  
  
  
  outbuf_size = 500000;
  
  outbuf = new uint8_t[outbuf_size];
  
  
  
  if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)     //open codec
  
  {
  
      cout << "Could not open codec\n";
  
      exit(1);
  
  }
  
  
  
  file = fopen(videofile_name, "wb");                 //open file
  
  if (!file)
  
  {
  
      cout << "Could not open " << videofile_name << endl;
  
      exit(1);
  
  }
  
  
  
  outpic_size = avpicture_get_size(out_pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
  outpic_buf = new uint8_t[outpic_size];
  
  cout << "Outpic size was setted to: " << outpic_size << endl;
  
  
  
  size = pCodecCtx->width * pCodecCtx->height;
  
  picture_buf = new uint8_t[size * 3];
  
  
  
  
  
  for (i = 1; i < 5; i++) 
  
  {   
  
      fflush(stdout);
  
  
  
      stringstream ss;
  
      ss << i;
  
      filename = name + ss.str() + ext;
  
      path = dir + filename;
  
  
  
      dib = FreeImage_Load(FIF_JPEG, path.c_str(), 0);
  
  
  
      picture_buf = FreeImage_GetBits(dib);
  
  
  
              h = FreeImage_GetHeight(dib);
  
      w = FreeImage_GetWidth(dib);
  
  
  
      avpicture_fill((AVPicture*)picture, picture_buf, in_pix_fmt, w, h);
  
      avpicture_fill((AVPicture*)outpic, outpic_buf, out_pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
  
  
      struct SwsContext* fooContext = sws_getContext(w, h, in_pix_fmt, pCodecCtx->width, pCodecCtx->height, out_pix_fmt, SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
      sws_scale(fooContext, picture->data, picture->linesize, 0, pCodecCtx->height, outpic->data, outpic->linesize);
  
  
  
      //encode single frame
  
      out_size = avcodec_encode_video(pCodecCtx, outpic_buf, outpic_size, outpic);
  
      cout << "encoding frame " << i << "(size=" << out_size << ")\n";
  
      fwrite(outbuf, 1, out_size, file);
  
  
  
  }
  
  
  
  //encode delayed frames
  
  for ( ; out_size; i++) 
  
  {
  
      fflush(stdout);
  
      out_size = avcodec_encode_video(pCodecCtx, outbuf, outbuf_size, NULL);
  
      cout << "write frame " << i << "(size=" << out_size << ")\n";
  
      fwrite(outbuf, 1, out_size, file);
  
  }
  
  
  
  outbuf[0] = 0x00;
  
  outbuf[1] = 0x00;
  
  outbuf[2] = 0x01;
  
  outbuf[3] = 0xb7;
  
  fwrite(outbuf, 1, 4, file);
  
  
  
  fclose(file);
  
  delete outbuf;
  
  avcodec_close(pCodecCtx);
  
  av_free(pCodecCtx);
  
  avpicture_free((AVPicture*)picture);
  
  avpicture_free((AVPicture*)outpic);
  
  delete picture_buf;
  
  delete outpic_buf;

• FFMPEG subtitle : mov_text removal

  27 mars 2014, par user3461178

  I have problems with subtitles. My video playout can not play them. So I have been trying to remove it.

  C:\Users\Jakub\Desktop\eclipse\workspace\tvpohoda_archiv>"c:\\lib/ffmpeg/bin/ffm
  
  peg.exe" -i "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c.m4v"  -sn -c:a copy -c:v
  
   copy  "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov"
  
  ffmpeg version N-57650-gcb52d6d Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Oct 30 2013 20:35:46 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 48.100 / 52. 48.100
  
    libavcodec     55. 39.100 / 55. 39.100
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videa/1050028-CITRON_-_Uz_zavrate_ridno
  
  u_c.m4v':
  
    Metadata:
  
      major_brand     : M4V
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1
  
      encoder         : Lavf55.19.104
  
    Duration: 00:04:56.49, start: 0.021333, bitrate: 7239 kb/s
  
      Chapter #0.0: start 0.000000, end 296.400000
  
      Metadata:
  
        title           : Chapter 1
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [
  
  SAR 212:225 DAR 53:45], 6997 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 24
  
  0 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  File 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov' already exists. Overwrite
  
   ? [y/N] y
  
  Output #0, mov, to 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov':
  
    Metadata:
  
      major_brand     : M4V
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1
  
      encoder         : Lavf55.19.104
  
      Chapter #0.0: start 0.021000, end 296.421000
  
      Metadata:
  
        title           : Chapter 1
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 720x576 [SAR 212
  
  :225 DAR 53:45], q=2-31, 6997 kb/s, 25 fps, 12800 tbn, 12800 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 240 kb/s
  
   (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 7408 fps=0.0 q=-1.0 Lsize=  262031kB time=00:04:56.49 bitrate=7239.9kbits
  
  /s
  
  video:253116kB audio:8700kB subtitle:0 global headers:0kB muxing overhead 0.0820
  
  40%

  Or :

  C:\Users\Jakub\Desktop\eclipse\workspace\tvpohoda_archiv>"c:\\lib/ffmpeg/bin/ffm
  
  peg.exe" -i "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c.m4v"  -map 0:0 -map 0:1
  
  -c:a copy -c:v copy  "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov"
  
  ffmpeg version N-57650-gcb52d6d Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Oct 30 2013 20:35:46 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 48.100 / 52. 48.100
  
    libavcodec     55. 39.100 / 55. 39.100
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videa/1050028-CITRON_-_Uz_zavrate_ridno
  
  u_c.m4v':
  
    Metadata:
  
      major_brand     : M4V
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1
  
      encoder         : Lavf55.19.104
  
    Duration: 00:04:56.49, start: 0.021333, bitrate: 7239 kb/s
  
      Chapter #0.0: start 0.000000, end 296.400000
  
      Metadata:
  
        title           : Chapter 1
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [
  
  SAR 212:225 DAR 53:45], 6997 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 24
  
  0 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574)
  
      Metadata:
  
        handler_name    : SubtitleHandler
  
  Output #0, mov, to 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov':
  
    Metadata:
  
      major_brand     : M4V
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1
  
      encoder         : Lavf55.19.104
  
      Chapter #0.0: start 0.021000, end 296.421000
  
      Metadata:
  
        title           : Chapter 1
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 720x576 [SAR 212
  
  :225 DAR 53:45], q=2-31, 6997 kb/s, 25 fps, 12800 tbn, 12800 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 240 kb/s
  
   (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 2702 fps=0.0 q=-1.0 size=   95498kB time=00:01:48.03 bitrate=7241.6kbits/
  
  frame= 4436 fps=4435 q=-1.0 size=  157319kB time=00:02:57.38 bitrate=7265.2kbits
  
  frame= 6296 fps=4196 q=-1.0 size=  223194kB time=00:04:11.77 bitrate=7262.0kbits
  
  frame= 7408 fps=4121 q=-1.0 Lsize=  262031kB time=00:04:56.49 bitrate=7239.9kbit
  
  s/s
  
  video:253116kB audio:8700kB subtitle:0 global headers:0kB muxing overhead 0.0820
  
  40%

  But it did not worked, subtitles have stayed there.

  i am normally starting this ffmpeg from java but this files are from command line

  Please can you help me ?

• Android h264 decode non-existing PPS 0 referenced

  22 janvier 2014, par nmxprime

  In Android JNI, using ffmpeg with libx264 use below codes to encode and decode raw rgb data !. I should use swscale to convert rgb565 to yuv420p as required by H.264. But not clear about this conversion.Please help, where i am wrong, with regard the log i get !

  Code for Encoding

  codecinit()- called once(JNI wrapper function)

  int Java_com_my_package_codecinit (JNIEnv *env, jobject thiz) {
  
  avcodec_register_all();
  
  codec = avcodec_find_encoder(AV_CODEC_ID_H264);//AV_CODEC_ID_MPEG1VIDEO);
  
  if(codec->id == AV_CODEC_ID_H264)
  
      __android_log_write(ANDROID_LOG_ERROR, "set","h264_encoder");
  
  
  
  if (!codec) {
  
      fprintf(stderr, "codec not found\n");
  
      __android_log_write(ANDROID_LOG_ERROR, "codec", "not found");
  
  
  
  }
  
      __android_log_write(ANDROID_LOG_ERROR, "codec", "alloc-contest3");
  
  c= avcodec_alloc_context3(codec);
  
  if(c == NULL)
  
      __android_log_write(ANDROID_LOG_ERROR, "avcodec","context-null");
  
  
  
  picture= av_frame_alloc();
  
  
  
  if(picture == NULL)
  
      __android_log_write(ANDROID_LOG_ERROR, "picture","context-null");
  
  
  
  c->bit_rate = 400000;
  
  c->height = 800;
  
  c->time_base= (AVRational){1,25};
  
  c->gop_size = 10; 
  
  c->max_b_frames=1;
  
  c->pix_fmt = AV_PIX_FMT_YUV420P;
  
  outbuf_size = 768000;
  
  c->width = 480;
  
  
  
  size = (c->width * c->height);
  
  
  
  if (avcodec_open2(c, codec,NULL) < 0) {
  
  
  
  __android_log_write(ANDROID_LOG_ERROR, "codec", "could not open");
  
  
  
  
  
  }
  
  
  
  ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height,
  
                       c->pix_fmt, 32);
  
  if (ret < 0) {
  
          __android_log_write(ANDROID_LOG_ERROR, "image","alloc-failed");
  
      fprintf(stderr, "could not alloc raw picture buffer\n");
  
  
  
  }
  
  
  
  picture->format = c->pix_fmt;
  
  picture->width  = c->width;
  
  picture->height = c->height;
  
  return 0;
  
  
  
  }

  encodeframe()-called in a while loop

  int Java_com_my_package_encodeframe (JNIEnv *env, jobject thiz,jbyteArray buffer) {
  
  jbyte *temp= (*env)->GetByteArrayElements(env, buffer, 0);
  
  Output = (char *)temp;
  
  const uint8_t * const inData[1] = { Output }; 
  
  const int inLinesize[1] = { 2*c->width };
  
  
  
  //swscale should implement here
  
  
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;    // packet data will be allocated by the encoder
  
      pkt.size = 0;
  
  
  
      fflush(stdout);
  
  picture->data[0] = Output;
  
  ret = avcodec_encode_video2(c, &pkt, picture,&got_output);
  
  
  
      fprintf(stderr,"ret = %d, got-out = %d \n",ret,got_output);
  
       if (ret < 0) {
  
                  __android_log_write(ANDROID_LOG_ERROR, "error","encoding");
  
          if(got_output > 0)
  
          __android_log_write(ANDROID_LOG_ERROR, "got_output","is non-zero");
  
  
  
      }
  
  
  
      if (got_output) {
  
          fprintf(stderr,"encoding frame %3d (size=%5d): (ret=%d)\n", 1, pkt.size,ret);
  
          fprintf(stderr,"before caling decode");
  
          decode_inline(&pkt); //function that decodes right after the encode
  
          fprintf(stderr,"after caling decode");
  
  
  
  
  
          av_free_packet(&pkt);
  
      }
  
  
  
  
  
  fprintf(stderr,"y val: %d \n",y);
  
  
  
  
  
  (*env)->ReleaseByteArrayElements(env, buffer, Output, 0);
  
  return ((ret));
  
  }

  decode_inline() function

  decode_inline(AVPacket *avpkt){
  
  AVCodec *codec;
  
  AVCodecContext *c = NULL;
  
  int frame, got_picture, len = -1,temp=0;
  
  
  
  AVFrame *rawFrame, *rgbFrame;
  
  uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
  char buf[1024];
  
  char rawBuf[768000],rgbBuf[768000];
  
  
  
  struct SwsContext *sws_ctx;
  
  
  
  memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  
  avcodec_register_all();
  
  
  
  c= avcodec_alloc_context3(codec);
  
  if(c == NULL)
  
      __android_log_write(ANDROID_LOG_ERROR, "avcodec","context-null");
  
  
  
  codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
  if (!codec) {
  
      fprintf(stderr, "codec not found\n");
  
      fprintf(stderr, "codec = %p \n", codec);
  
      }
  
  c->pix_fmt = AV_PIX_FMT_YUV420P;
  
  c->width = 480;
  
  c->height = 800;
  
  
  
  rawFrame = av_frame_alloc();
  
  rgbFrame = av_frame_alloc();
  
  
  
  if (avcodec_open2(c, codec, NULL) < 0) {
  
      fprintf(stderr, "could not open codec\n");
  
      exit(1);
  
      }
  
  sws_ctx = sws_getContext(c->width, c->height,/*PIX_FMT_RGB565BE*/
  
              PIX_FMT_YUV420P, c->width, c->height, AV_PIX_FMT_RGB565/*PIX_FMT_YUV420P*/,
  
              SWS_BILINEAR, NULL, NULL, NULL);
  
  
  
  
  
  frame = 0;
  
  
  
  unsigned short *decodedpixels = &rawBuf;
  
  rawFrame->data[0] = &rawBuf;
  
  rgbFrame->data[0] = &rgbBuf;
  
  
  
  fprintf(stderr,"size of avpkt %d \n",avpkt->size);
  
  temp = avpkt->size;
  
  while (temp > 0) {
  
          len = avcodec_decode_video2(c, rawFrame, &got_picture, avpkt);
  
  
  
          if (len < 0) {
  
              fprintf(stderr, "Error while decoding frame %d\n", frame);
  
              exit(1);
  
              }
  
          temp -= len;
  
          avpkt->data += len;
  
  
  
          if (got_picture) {
  
              printf("saving frame %3d\n", frame);
  
              fflush(stdout);
  
          //TODO  
  
          //memcpy(decodedpixels,rawFrame->data[0],rawFrame->linesize[0]); 
  
          //  decodedpixels +=rawFrame->linesize[0];
  
  
  
              frame++;
  
              }
  
  
  
          }
  
  
  
  avcodec_close(c);
  
  av_free(c);
  
  //free(rawBuf);
  
  //free(rgbBuf);
  
  av_frame_free(&rawFrame);
  
  av_frame_free(&rgbFrame);

  }

  The log i get

  For the decode_inline() function :

  ---

  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] non-existing PPS 0 referenced
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] decode_slice_header error
  
  01-02 14:50:50.160: I/stderr(3407): [h264 @ 0x8db540] Invalid mix of idr and non-idr slices
  
  01-02 14:50:50.160: I/stderr(3407): Error while decoding frame 0

  Edit : Changing GOP value :

  If i change c->gop_size = 3; as expected it emits one I frame every three frames. The non-existing PPS 0 referenced message is not there for in every third execution, but all other have this message