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• encode h264 video using ffmpeg library memory issues

  31 mars 2015, par Zeppa

  I’m trying to do screen capture on OS X using ffmpeg’s avfoundation library. I capture frames from the screen and encode it using H264 into an flv container.

  Here’s the command line output of the program :

  Input #0, avfoundation, from 'Capture screen 0':
  
    Duration: N/A, start: 9.253649, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1440x900, 14.58 tbr, 1000k tbn, 1000k tbc
  
  raw video is inCodec
  
  FLV (Flash Video)http://localhost:8090/test.flv
  
  [libx264 @ 0x102038e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x102038e00] profile High, level 4.0
  
  [libx264 @ 0x102038e00] 264 - core 142 r2495 6a301b6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=1 weightp=2 keyint=50 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [tcp @ 0x101a5fe70] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  [tcp @ 0x101a5fe70] Connection to tcp://localhost:8090 failed: Connection refused
  
  url_fopen failed: Operation now in progress
  
  [flv @ 0x102038800] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
  encoded frame #0
  
  encoded frame #1
  
  ......
  
  encoded frame #49
  
  encoded frame #50
  
  testmee(8404,0x7fff7e05c300) malloc: *** error for object 0x102053e08: incorrect checksum for freed object - object was probably modified after being freed.
  
  *** set a breakpoint in malloc_error_break to debug
  
  (lldb) bt
  
  * thread #10: tid = 0x43873, 0x00007fff95639286 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
  
    * frame #0: 0x00007fff95639286 libsystem_kernel.dylib`__pthread_kill + 10
  
      frame #1: 0x00007fff9623742f libsystem_pthread.dylib`pthread_kill + 90
  
      frame #2: 0x00007fff977ceb53 libsystem_c.dylib`abort + 129
  
      frame #3: 0x00007fff9ab59e06 libsystem_malloc.dylib`szone_error + 625
  
      frame #4: 0x00007fff9ab4f799 libsystem_malloc.dylib`small_malloc_from_free_list + 1105
  
      frame #5: 0x00007fff9ab4d3bc libsystem_malloc.dylib`szone_malloc_should_clear + 1449
  
      frame #6: 0x00007fff9ab4c877 libsystem_malloc.dylib`malloc_zone_malloc + 71
  
      frame #7: 0x00007fff9ab4b395 libsystem_malloc.dylib`malloc + 42
  
      frame #8: 0x00007fff94aa63d2 IOSurface`IOSurfaceClientLookupFromMachPort + 40
  
      frame #9: 0x00007fff94aa6b38 IOSurface`IOSurfaceLookupFromMachPort + 12
  
      frame #10: 0x00007fff92bfa6b2 CoreGraphics`_CGYDisplayStreamFrameAvailable + 342
  
      frame #11: 0x00007fff92f6759c CoreGraphics`CGYDisplayStreamNotification_server + 336
  
      frame #12: 0x00007fff92bfada6 CoreGraphics`display_stream_runloop_callout + 46
  
      frame #13: 0x00007fff956eba07 CoreFoundation`__CFMachPortPerform + 247
  
      frame #14: 0x00007fff956eb8f9 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
  
      frame #15: 0x00007fff956eb86b CoreFoundation`__CFRunLoopDoSource1 + 475
  
      frame #16: 0x00007fff956dd3e7 CoreFoundation`__CFRunLoopRun + 2375
  
      frame #17: 0x00007fff956dc858 CoreFoundation`CFRunLoopRunSpecific + 296
  
      frame #18: 0x00007fff95792ef1 CoreFoundation`CFRunLoopRun + 97
  
      frame #19: 0x0000000105f79ff1 CMIOUnits`___lldb_unnamed_function2148$$CMIOUnits + 875
  
      frame #20: 0x0000000105f6f2c2 CMIOUnits`___lldb_unnamed_function2127$$CMIOUnits + 14
  
      frame #21: 0x00007fff97051765 CoreMedia`figThreadMain + 417
  
      frame #22: 0x00007fff96235268 libsystem_pthread.dylib`_pthread_body + 131
  
      frame #23: 0x00007fff962351e5 libsystem_pthread.dylib`_pthread_start + 176
  
      frame #24: 0x00007fff9623341d libsystem_pthread.dylib`thread_start + 13

  I’ve attached the code I used below.

  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  #include <libavutil></libavutil>opt.h>
  
  #include 
  
  #include 
  
  #include 
  
  /* compile using
  
  gcc -g -o stream test.c -lavformat -lavutil -lavcodec -lavdevice -lswscale
  
  */
  
  
  
  // void show_av_device() {
  
  
  
  //    inFmt->get_device_list(inFmtCtx, device_list);
  
  //    printf("Device Info=============\n");
  
  //    //avformat_open_input(&amp;inFmtCtx,"video=Capture screen 0",inFmt,&amp;inOptions);
  
  //    printf("===============================\n");
  
  // }
  
  
  
  void AVFAIL (int code, const char *what) {
  
      char msg[500];
  
      av_strerror(code, msg, sizeof(msg));
  
      fprintf(stderr, "failed: %s\nerror: %s\n", what, msg);
  
      exit(2);
  
  }
  
  
  
  #define AVCHECK(f) do { int e = (f); if (e &lt; 0) AVFAIL(e, #f); } while (0)
  
  #define AVCHECKPTR(p,f) do { p = (f); if (!p) AVFAIL(AVERROR_UNKNOWN, #f); } while (0)
  
  
  
  void registerLibs() {
  
      av_register_all();
  
      avdevice_register_all();
  
      avformat_network_init();
  
      avcodec_register_all();
  
  }
  
  
  
  int main(int argc, char *argv[]) {
  
  
  
      //conversion variables
  
      struct SwsContext *swsCtx = NULL;
  
      //input stream variables
  
      AVFormatContext   *inFmtCtx = NULL;
  
      AVCodecContext    *inCodecCtx = NULL;
  
      AVCodec           *inCodec = NULL;
  
      AVInputFormat     *inFmt = NULL;
  
      AVFrame           *inFrame = NULL;
  
      AVDictionary      *inOptions = NULL;
  
      const char *streamURL = "http://localhost:8090/test.flv";
  
      const char *name = "avfoundation";
  
  
  
  //    AVFrame           *inFrameYUV = NULL;
  
      AVPacket          inPacket;
  
  
  
  
  
      //output stream variables
  
      AVCodecContext    *outCodecCtx = NULL;
  
      AVCodec           *outCodec;
  
      AVFormatContext   *outFmtCtx = NULL;
  
      AVOutputFormat    *outFmt = NULL;
  
      AVFrame           *outFrameYUV = NULL;
  
      AVStream          *stream = NULL;
  
  
  
      int               i, videostream, ret;
  
      int               numBytes, frameFinished;
  
  
  
      registerLibs();
  
      inFmtCtx = avformat_alloc_context(); //alloc input context
  
      av_dict_set(&amp;inOptions, "pixel_format", "uyvy422", 0);
  
      av_dict_set(&amp;inOptions, "probesize", "7000000", 0);
  
  
  
      inFmt = av_find_input_format(name);
  
      ret = avformat_open_input(&amp;inFmtCtx, "Capture screen 0:", inFmt, &amp;inOptions);
  
      if (ret &lt; 0) {
  
          printf("Could not load the context for the input device\n");
  
          return -1;
  
      }
  
      if (avformat_find_stream_info(inFmtCtx, NULL) &lt; 0) {
  
          printf("Could not find stream info for screen\n");
  
          return -1;
  
      }
  
      av_dump_format(inFmtCtx, 0, "Capture screen 0", 0);
  
      // inFmtCtx->streams is an array of pointers of size inFmtCtx->nb_stream
  
  
  
      videostream = av_find_best_stream(inFmtCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &amp;inCodec, 0);
  
      if (videostream == -1) {
  
          printf("no video stream found\n");
  
          return -1;
  
      } else {
  
          printf("%s is inCodec\n", inCodec->long_name);
  
      }
  
      inCodecCtx = inFmtCtx->streams[videostream]->codec;
  
      // open codec
  
      if (avcodec_open2(inCodecCtx, inCodec, NULL) > 0) {
  
          printf("Couldn't open codec");
  
          return -1;  // couldn't open codec
  
      }
  
  
  
  
  
          //setup output params
  
      outFmt = av_guess_format(NULL, streamURL, NULL);
  
      if(outFmt == NULL) {
  
          printf("output format was not guessed properly");
  
          return -1;
  
      }
  
  
  
      if((outFmtCtx = avformat_alloc_context()) &lt; 0) {
  
          printf("output context not allocated. ERROR");
  
          return -1;
  
      }
  
  
  
      printf("%s", outFmt->long_name);
  
  
  
      outFmtCtx->oformat = outFmt;
  
  
  
      snprintf(outFmtCtx->filename, sizeof(outFmtCtx->filename), streamURL);
  
      printf("%s\n", outFmtCtx->filename);
  
  
  
      outCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      if(!outCodec) {
  
          printf("could not find encoder for H264 \n" );
  
          return -1;
  
      }
  
  
  
      stream = avformat_new_stream(outFmtCtx, outCodec);
  
      outCodecCtx = stream->codec;
  
      avcodec_get_context_defaults3(outCodecCtx, outCodec);
  
  
  
      outCodecCtx->codec_id = AV_CODEC_ID_H264;
  
      outCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
      outCodecCtx->flags = CODEC_FLAG_GLOBAL_HEADER;
  
      outCodecCtx->width = inCodecCtx->width;
  
      outCodecCtx->height = inCodecCtx->height;
  
      outCodecCtx->time_base.den = 25;
  
      outCodecCtx->time_base.num = 1;
  
      outCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
      outCodecCtx->gop_size = 50;
  
      outCodecCtx->bit_rate = 400000;
  
  
  
      //setup output encoders etc
  
      if(stream) {
  
          ret = avcodec_open2(outCodecCtx, outCodec, NULL);
  
          if (ret &lt; 0) {
  
              printf("Could not open output encoder");
  
              return -1;
  
          }
  
      }
  
  
  
      if (avio_open(&amp;outFmtCtx->pb, outFmtCtx->filename, AVIO_FLAG_WRITE ) &lt; 0) {
  
          perror("url_fopen failed");
  
      }
  
  
  
      avio_open_dyn_buf(&amp;outFmtCtx->pb);
  
      ret = avformat_write_header(outFmtCtx, NULL);
  
      if (ret != 0) {
  
          printf("was not able to write header to output format");
  
          return -1;
  
      }
  
      unsigned char *pb_buffer;
  
      int len = avio_close_dyn_buf(outFmtCtx->pb, (unsigned char **)(&amp;pb_buffer));
  
      avio_write(outFmtCtx->pb, (unsigned char *)pb_buffer, len);
  
  
  
  
  
      numBytes = avpicture_get_size(PIX_FMT_UYVY422, inCodecCtx->width, inCodecCtx->height);
  
      // Allocate video frame
  
      inFrame = av_frame_alloc();
  
  
  
      swsCtx = sws_getContext(inCodecCtx->width, inCodecCtx->height, inCodecCtx->pix_fmt, inCodecCtx->width,
  
                              inCodecCtx->height, PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
  
      int frame_count = 0;
  
      while(av_read_frame(inFmtCtx, &amp;inPacket) >= 0) {
  
          if(inPacket.stream_index == videostream) {
  
              avcodec_decode_video2(inCodecCtx, inFrame, &amp;frameFinished, &amp;inPacket);
  
              // 1 Frame might need more than 1 packet to be filled
  
              if(frameFinished) {
  
                  outFrameYUV = av_frame_alloc();
  
  
  
                  uint8_t *buffer = (uint8_t *)av_malloc(numBytes);
  
  
  
                  int ret = avpicture_fill((AVPicture *)outFrameYUV, buffer, PIX_FMT_YUV420P,
  
                                           inCodecCtx->width, inCodecCtx->height);
  
                  if(ret &lt; 0){
  
                      printf("%d is return val for fill\n", ret);
  
                      return -1;
  
                  }
  
                  //convert image to YUV
  
                  sws_scale(swsCtx, (uint8_t const * const* )inFrame->data,
  
                            inFrame->linesize, 0, inCodecCtx->height,
  
                            outFrameYUV->data, outFrameYUV->linesize);
  
                  //outFrameYUV now holds the YUV scaled frame/picture
  
                  outFrameYUV->format = outCodecCtx->pix_fmt;
  
                  outFrameYUV->width = outCodecCtx->width;
  
                  outFrameYUV->height = outCodecCtx->height;
  
  
  
  
  
                  AVPacket pkt;
  
                  int got_output;
  
                  av_init_packet(&amp;pkt);
  
                  pkt.data = NULL;
  
                  pkt.size = 0;
  
  
  
                  outFrameYUV->pts = frame_count;
  
  
  
                  ret = avcodec_encode_video2(outCodecCtx, &amp;pkt, outFrameYUV, &amp;got_output);
  
                  if (ret &lt; 0) {
  
                      fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  
                      return -1;
  
                  }
  
  
  
                  if(got_output) {
  
                      if(stream->codec->coded_frame->key_frame) {
  
                          pkt.flags |= AV_PKT_FLAG_KEY;
  
                      }
  
                      pkt.stream_index = stream->index;
  
                      if(pkt.pts != AV_NOPTS_VALUE)
  
                          pkt.pts = av_rescale_q(pkt.pts, stream->codec->time_base, stream->time_base);
  
                      if(pkt.dts != AV_NOPTS_VALUE)
  
                          pkt.dts = av_rescale_q(pkt.dts, stream->codec->time_base, stream->time_base);
  
                      if(avio_open_dyn_buf(&amp;outFmtCtx->pb)!= 0) {
  
                          printf("ERROR: Unable to open dynamic buffer\n");
  
                      }
  
                      ret = av_interleaved_write_frame(outFmtCtx, &amp;pkt);
  
                      unsigned char *pb_buffer;
  
                      int len = avio_close_dyn_buf(outFmtCtx->pb, (unsigned char **)&amp;pb_buffer);
  
                      avio_write(outFmtCtx->pb, (unsigned char *)pb_buffer, len);
  
  
  
                  } else {
  
                      ret = 0;
  
                  }
  
                  if(ret != 0) {
  
                      fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
  
                      exit(1);
  
                  }
  
  
  
                  fprintf(stderr, "encoded frame #%d\n", frame_count);
  
                  frame_count++;
  
  
  
                  av_free_packet(&amp;pkt);
  
                  av_frame_free(&amp;outFrameYUV);
  
                  av_free(buffer);
  
  
  
              }
  
          }
  
          av_free_packet(&amp;inPacket);
  
      }
  
      av_write_trailer(outFmtCtx);
  
  
  
      //close video stream
  
      if(stream) {
  
          avcodec_close(outCodecCtx);
  
      }
  
      for (i = 0; i &lt; outFmtCtx->nb_streams; i++) {
  
          av_freep(&amp;outFmtCtx->streams[i]->codec);
  
          av_freep(&amp;outFmtCtx->streams[i]);
  
      }
  
      if (!(outFmt->flags &amp; AVFMT_NOFILE))
  
      /* Close the output file. */
  
          avio_close(outFmtCtx->pb);
  
      /* free the output format context */
  
      avformat_free_context(outFmtCtx);
  
  
  
      // Free the YUV frame populated by the decoder
  
      av_free(inFrame);
  
  
  
      // Close the video codec (decoder)
  
      avcodec_close(inCodecCtx);
  
  
  
      // Close the input video file
  
      avformat_close_input(&amp;inFmtCtx);
  
  
  
      return 1;
  
  
  
  }

  I’m not sure what I’ve done wrong here. But, what I’ve observed is that for each frame thats been encoded, my memory usage goes up by about 6MB. Backtracking afterward usually leads one of the following two culprits :

  1. avf_read_frame function in avfoundation.m
  2. av_dup_packet function in avpacket.h

  Can I also get advice on the way I’m using avio_open_dyn_buff function to be able to stream over http? I’ve also attached my ffmpeg library versions below :

      ffmpeg version N-70876-g294bb6c Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
  
    configuration: --prefix=/usr/local --enable-gpl --enable-postproc --enable-pthreads --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-libvorbis --disable-mmx --disable-ssse3 --disable-armv5te --disable-armv6 --disable-neon --enable-shared --disable-static --disable-stripping
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 29.100 / 56. 29.100
  
    libavformat    56. 26.101 / 56. 26.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 13.101 /  5. 13.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Hyper fast Audio and Video encoder

  Valgrind analysis attached here because I exceeded stack overflow’s character limit. http://pastebin.com/MPeRhjhN

• Converted Avi to Mp4 using FFMPEG, Converted video not working in html 5 Tag

  21 mars 2015, par Suprabhat

  I have a section in my web page where user can upload any types of videos of any format , currently only restricted to .mp4 and .avi. After successfull upload i have displayed the same video to the user. I have bind the path in HTML5 video so that the user can view the content he/she has uploded. Video with extension .mp4 no doubt are working properly as HTML5 support them. Tricky part is it don’t support Avi files. Now here what the problem has arised. In order to display avi videos i have used FFMPEG to convert videos with extension .avi to .mp4. With lots of googling and reading forum, i have succesfully converted avi videos to mp4 . Here’s what i have used :-

  1. ffmpeg -i input.avi -acodec libfaac -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 output.mp4

  2. ffmpeg -i input.avi -c:v libx264 -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 output.mp4

  Above two are working perfectly, they have succesfully converted the video. But when i run them on browser in HTML5 and in new tab (Flash Player Plugin Installed), HTML5 doesn’t play it and flash player return an error message "Video can’t be played because the file is corrupt". But when i played them on KMplayer and in Window media player they are running perfectly.

  I have been to various threads in stackoverflow related to convert avi to mp4 and here i found following in one of the forum. where one of user has accepted this a correct answer but it ain’t worked out for me.

  3. ffmpeg -y -i sample.avi -b:v 1500k -vcodec libx264 -vpre slow -vpre baseline -g 30 sample.mp4

  Above argument returned me following error "File for preset ’slow’ not found".

  Following my futher searches i came across this thread ffmpeg convert mov file to mp4 for HTML5 video tag IE9. Here following argument worked perfectly and it able to convert video in such way that it is playble on browser.

  4. ffmpeg -y -i input.avi -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a 128k -pix_fmt yuv420p output.mp4.

  Problem i faced here was video is converted to 420p reso which quality is noty upto mark. Smaller resolution videos are been enlarged and seems pixelated

  Thus, i had to finally put up a question. I will be very obliged if someone can give a solution for above problem. I need to convert an avi video to mp4 supported by HTML5 video tag. It should able to play it on browser and during conversion of video it should maintain original audio and video quality plus resolution.

  Thanks

  My C# Code :

          public void Create(string input, string output, string parametri, string ThumbnailPhysicalPath, int ConvertType)
  
          {
  
              ffmpeg = new Process();
  
  
  
              if (ConvertType == Convert.ToInt32(ConversionType.Thumbnail))
  
                  ffmpeg.StartInfo.Arguments = " -i \"" + input + "\" -vframes 1 \"" + output + "\"";
  
              else if (ConvertType == Convert.ToInt32(ConversionType.AviToMp4))
  
                  ffmpeg.StartInfo.Arguments = " -i \"" + input + "\" -c:v libx264 -b:a 128k -vcodec mpeg4 -b:v 1200k -flags +aic+mv4 \"" + output + "\"";
  
                  //ffmpeg.StartInfo.Arguments = " -i \"" + input + "\" -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a 128k -pix_fmt yuv420p \"" + output + "\"";
  
              ffmpeg.StartInfo.FileName = ThumbnailPhysicalPath + @"ffmpeg.exe";
  
              ffmpeg.StartInfo.UseShellExecute = false;
  
              ffmpeg.StartInfo.RedirectStandardOutput = true;
  
              ffmpeg.StartInfo.RedirectStandardError = true;
  
              ffmpeg.StartInfo.CreateNoWindow = true;
  
              try
  
              {
  
                  ffmpeg.Start();
  
                  ffmpeg.WaitForExit();
  
                  string error = ffmpeg.StandardError.ReadToEnd();
  
              }
  
              catch (Exception Ex)
  
              {
  
                  Common.WriteLog("Exception occurred during conversion. Error Message :- " + Ex.Message + "\n Input Parameter :- " + input+ "\n Output Paramenter :- "+ output);
  
              }
  
              finally
  
              {
  
                  ffmpeg.Close();
  
                  if (ConvertType == Convert.ToInt32(ConversionType.AviToMp4))
  
                      UpdateConvertedVideoDetails(input,output);
  
              }
  
          }

  Command Prompt FFMPEG Output :-

  Sample 3 Result :-

  D:\Client\WebSite\Converter_Tools>ffmpeg -y -i sample.avi -b:v 1500k -vcodec libx264 -vpre slow -vpre baseline -g 30 sample.mp4
  
  ffmpeg version N-70239-g111d79a Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enab
  
  le-zlib
  
    libavutil      54. 19.100 / 54. 19.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 23.105 / 56. 23.105
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.101 /  5. 11.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [avi @ 037c8480] non-interleaved AVI
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, avi, from 'sample.avi':
  
    Duration: 00:00:34.00, start: 0.000000, bitrate: 1433 kb/s
  
      Stream #0:0: Video: cinepak (cvid / 0x64697663), rgb24, 320x240, 15 fps, 15 tbr, 15 tbn, 15 tbc
  
      Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 22050 Hz, 1 channels, u8, 176 kb/s
  
  File for preset 'slow' not found

  Sample 4 Result :-

  D:\Client\WebSite\Converter_Tools>ffmpeg -y -i input.avi -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_
  
  aacenc -b:a 128k -pix_fmt yuv420p output.mp4
  
  ffmpeg version N-70239-g111d79a Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
  
  enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enab
  
  le-zlib
  
    libavutil      54. 19.100 / 54. 19.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 23.105 / 56. 23.105
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.101 /  5. 11.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, avi, from 'input.avi':
  
    Duration: 00:00:03.93, start: 0.000000, bitrate: 3255 kb/s
  
      Stream #0:0: Video: msrle ([1][0][0][0] / 0x0001), pal8, 300x250, 3301 kb/s, 15 fps, 15 tbr, 15 tbn, 15 tbc
  
  [libx264 @ 002ec860] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 002ec860] profile High, level 2.2
  
  [libx264 @ 002ec860] 264 - core 144 r2525 40bb568 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subm
  
  e=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 i
  
  nterlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=50 rc
  
  =cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf56.23.105
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 576x480, q=-1--1, 500 kb/s, 15 fps, 15360 tbn, 15 tbc
  
      Metadata:
  
        encoder         : Lavc56.26.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (msrle (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   59 fps= 30 q=-1.0 Lsize=     229kB time=00:00:03.80 bitrate= 493.5kbits/s
  
  video:227kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.637976%
  
  [libx264 @ 002ec860] frame I:3     Avg QP:26.53  size: 10657
  
  [libx264 @ 002ec860] frame P:25    Avg QP:30.49  size:  5608
  
  [libx264 @ 002ec860] frame B:31    Avg QP:32.26  size:  1935
  
  [libx264 @ 002ec860] consecutive B-frames: 22.0% 16.9% 20.3% 40.7%
  
  [libx264 @ 002ec860] mb I  I16..4: 16.7% 69.0% 14.4%
  
  [libx264 @ 002ec860] mb P  I16..4: 11.1% 29.9%  3.8%  P16..4: 21.3%  6.8%  2.6%  0.0%  0.0%    skip:24.6%
  
  [libx264 @ 002ec860] mb B  I16..4:  1.7%  3.0%  0.3%  B16..8: 29.7%  5.6%  0.8%  direct: 2.1%  skip:56.8%  L0:50.5% L1:45.6% BI: 3.9%
  
  [libx264 @ 002ec860] 8x8 transform intra:66.5% inter:79.4%
  
  [libx264 @ 002ec860] direct mvs  spatial:93.5% temporal:6.5%
  
  [libx264 @ 002ec860] coded y,uvDC,uvAC intra: 40.3% 48.8% 25.7% inter: 12.4% 8.4% 1.4%
  
  [libx264 @ 002ec860] i16 v,h,dc,p: 19% 59%  6% 17%
  
  [libx264 @ 002ec860] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 25% 16%  7%  8%  6% 11%  7% 10%
  
  [libx264 @ 002ec860] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 21%  9%  7%  9%  8% 10%  7% 10%
  
  [libx264 @ 002ec860] i8c dc,h,v,p: 41% 33% 13% 13%
  
  [libx264 @ 002ec860] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 002ec860] ref P L0: 67.6%  8.1%  9.6%  5.4%  6.6%  2.8%
  
  [libx264 @ 002ec860] ref B L0: 84.6% 10.5%  3.9%  1.0%
  
  [libx264 @ 002ec860] ref B L1: 95.9%  4.1%
  
  [libx264 @ 002ec860] kb/s:472.20

• How to expose new API methods in the HTTP Reporting API – Introducing the Piwik Platform

  26 février 2015, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to write UI tests for your plugin). This time you’ll learn how to extend our Reporting API. For this tutorial you will need to have basic knowledge of PHP.

  What is Piwik’s Reporting API ?

  It allows third party applications to access analytics data and manipulate miscellaneous data (such as users or websites) through HTTP requests.

  What is it good for ?

  The Reporting API is used by the Piwik UI to render reports, to manage users, and more. If you want to add a feature to the Piwik UI, you might have to expose a method in the API to access this data. As the API is called via HTTP it allows you to fetch or manipulate any Piwik related data from anywhere. In these exposed API methods you can do pretty much anything you want, for example :

  • Enhance existing reports with additional data
  • Filter existing reports based on custom rules
  • Access the database and generate custom reports
  • Persist and read any data
  • Request server information

  Getting started

  In this series of posts, we assume that you have already set up your development environment. If not, visit the Piwik Developer Zone where you’ll find the tutorial Setting up Piwik.

  To summarize the things you have to do to get setup :

  • Install Piwik (for instance via git).
  • Activate the developer mode : ./console development:enable.
  • Generate a plugin : ./console generate:plugin --name="MyApiPlugin". There should now be a folder plugins/MyApiPlugin.
  • And activate the created plugin : ./console plugin:activate "MyApiPlugin"

  Let’s start creating an API

  We start by using the Piwik Console to create a new API :

  ./console generate:api

  The command will ask you to enter the name of the plugin the created API should belong to. I will simply use the above chosen plugin name “MyApiPlugin”. There should now be a file plugins/MyApiPlugin/API.php which contains already an example to get you started easily :

  class API extends \Piwik\Plugin\API
  {
      public function getAnswerToLife($truth = true)
      {
          if ($truth) {
              return 42;
          }
   
          return 24;
      }
   
      public function getExampleReport($idSite, $period, $date, $wonderful = false)
      {
          $table = DataTable::makeFromSimpleArray(array(
              array('label' => 'My Label 1', 'nb_visits' => '1'),
              array('label' => 'My Label 2', 'nb_visits' => '5'),
          ));
   
          return $table;
      }
  }
  Télécharger

  Any public method in that file will be available via the Reporting API. For example the method getAnswerToLife can be called via this URL : index.php?module=API&method=MyApiPlugin.getAnswerToLife. The URL parameter method is a combination of your plugin name and the method name within this class.

  Passing parameters to your method

  Both example methods define some parameters. To pass any value to a parameter of your method simply specify them by name in the URL. For example ...&method=MyApiPlugin.getExampleReport&idSite=1&period=week&date=today&wonderful=1 to pass values to the parameters of the method getExampleReport.

  Returning a value

  In an API method you can return any boolean, number, string or array value. A resource or an object cannot be returned unless it implements the DataTableInterface such as DataTable (the primary data structure used to store analytics data in Piwik), DataTable\Map (stores a set of DataTables) and DataTable\Simple (a DataTable where every row has two columns : label and value).

  Did you know ? You can choose the response format of your API request by appending a parameter &format=JSON|XML|CSV|... to the URL. Check out the Reporting API Reference for more information.

  Best practices

  Check user permissions

  Do not forget to check whether a user actually has permissions to access data or to perform an action. If you’re not familiar with Piwik’s permissions and how to check them read our User Permission guide.

  Keep API methods small

  At Piwik we aim to write clean code. Therefore, we recommend to keep API methods small (separation of concerns). An API pretty much acts like a Controller :

  public function createLdapUser($idSite, $login, $password)
  {
      Piwik::checkUserHasAdminAccess($idSite);
      $this->checkLogin($login);
      $this->checkPassword($password);
      
      $myModel = new LdapModel();
      $success = $myModel->createUser($idSite, $login, $password);
      
      return $success;
  }
  Télécharger

  This is not only easy to read, it will also allow you to create simple tests for LdapModel (without having to bootstrap the whole Piwik layer) and you will be able to reuse it in other places if needed.

  Calling APIs of other plugins

  For example if you want to fetch an existing report from another plugin, say a list of all Page URLs, do not request this report by calling that method directly :

  \Piwik\Plugins\Actions\API::getInstance()->getPageUrls($idSite, $period, $date);

  . Instead, issue a new API request :

  $report = \Piwik\API\Request::processRequest('Actions.getPageUrls', array(
  
      'idSite' => $idSite,
  
      'period' => $period,
  
      'date'   => $date,
  
  ));

  This has several advantages :

  • It avoids a fatal error if the requested plugin is not available on a Piwik installation
  • Other plugins can extend the called API method via events (adding additional report data to a report, doing additional permission checks) but those events will be only triggered when requesting the report as suggested
  • If the method parameters change, your request will most likely still work

  Publishing your Plugin on the Marketplace

  In case you want to share your API with other Piwik users you can do this by pushing your plugin to a public GitHub repository and creating a tag. Easy as that. Read more about how to distribute a plugin and best practices when publishing a plugin.

  Isn’t it easy to create a API ? We never even created a file ! If you have any feedback regarding our APIs or our guides in the Developer Zone feel free to send it to us.