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• Documentation #3972 : template variants and possible bug ?

  6 juillet 2017, par Kamran Mir Hazar

  Yes, please update the documentation if it is the case.

  PS : Where can I have feature request for SPIP ?

  On Thu, Jul 6, 2017 at 2:34 PM, <redmine@spip.org> wrote :

  La demande #3972 a été mise à jour par marcimat Ÿ

• Scale filter crashes with error when used from transcoding example

  27 juin 2017, par Vali

  I’ve modified a bit (just to compile in c++) this code example :
  https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/transcoding.c.

  What works : as is (null filter), a number of other filters like framerate, drawtext, ...

  What doesn’t work : scale filter when scaling down.

  I use the following syntax for scale ( I’ve tried many others also, same effect) :
  "scale=w=iw/2 :-1"

  The error is : "Input picture width (240) is greater than stride (128)" where the values for width and stride depend on the input.

  Misc environment info : windows, VS 2017, input example : rtsp ://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov

  Any clue as to what I’m doing wrong ?

  Thanks !

  ---

  EDITED to add working code sample

  ---

  #pragma comment(lib, "avcodec.lib")
  
  #pragma comment(lib, "avutil.lib")
  
  #pragma comment(lib, "avformat.lib")
  
  #pragma comment(lib, "avfilter.lib")
  
  
  
  /*
  
  * Copyright (c) 2010 Nicolas George
  
  * Copyright (c) 2011 Stefano Sabatini
  
  * Copyright (c) 2014 Andrey Utkin
  
  *
  
  **** EDITED 2017 for testing (see original here: https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/transcoding.c)
  
  *
  
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  
  * of this software and associated documentation files (the "Software"), to deal
  
  * in the Software without restriction, including without limitation the rights
  
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  
  * copies of the Software, and to permit persons to whom the Software is
  
  * furnished to do so, subject to the following conditions:
  
  *
  
  * The above copyright notice and this permission notice shall be included in
  
  * all copies or substantial portions of the Software.
  
  *
  
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  
  * THE SOFTWARE.
  
  */
  
  
  
  /**
  
  * @file
  
  * API example for demuxing, decoding, filtering, encoding and muxing
  
  * @example transcoding.c
  
  */
  
  
  
  extern "C"
  
  {
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavfilter></libavfilter>avfiltergraph.h>
  
      #include <libavfilter></libavfilter>buffersink.h>
  
      #include <libavfilter></libavfilter>buffersrc.h>
  
      #include <libavutil></libavutil>opt.h>
  
      #include <libavutil></libavutil>pixdesc.h>
  
  }
  
  
  
  
  
  static AVFormatContext *ifmt_ctx;
  
  static AVFormatContext *ofmt_ctx;
  
  typedef struct FilteringContext {
  
      AVFilterContext *buffersink_ctx;
  
      AVFilterContext *buffersrc_ctx;
  
      AVFilterGraph *filter_graph;
  
  } FilteringContext;
  
  static FilteringContext *filter_ctx;
  
  
  
  typedef struct StreamContext {
  
      AVCodecContext *dec_ctx;
  
      AVCodecContext *enc_ctx;
  
  } StreamContext;
  
  static StreamContext *stream_ctx;
  
  
  
  static int open_input_file(const char *filename, int&amp; videoStreamIndex)
  
  {
  
      int ret;
  
      unsigned int i;
  
  
  
      ifmt_ctx = NULL;
  
      if ((ret = avformat_open_input(&amp;ifmt_ctx, filename, NULL, NULL)) &lt; 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
  
          return ret;
  
      }
  
  
  
      if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) &lt; 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
  
          return ret;
  
      }
  
  
  
      // Just need video
  
      videoStreamIndex = -1;
  
      for (unsigned int i = 0; i &lt; ifmt_ctx->nb_streams; i++)
  
      {
  
          if (ifmt_ctx->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
  
              continue;
  
          videoStreamIndex = i;
  
          break;
  
      }
  
      if (videoStreamIndex &lt; 0)
  
      {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot find video stream\n");
  
          return videoStreamIndex;
  
      }
  
  
  
  
  
      stream_ctx = (StreamContext*)av_mallocz_array(ifmt_ctx->nb_streams, sizeof(*stream_ctx));
  
      if (!stream_ctx)
  
          return AVERROR(ENOMEM);
  
  
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
  
  
          // Just need video
  
          if (i != videoStreamIndex)
  
              continue;
  
  
  
  
  
          AVStream *stream = ifmt_ctx->streams[i];
  
          AVCodec *dec = avcodec_find_decoder(stream->codecpar->codec_id);
  
          AVCodecContext *codec_ctx;
  
          if (!dec) {
  
              av_log(NULL, AV_LOG_ERROR, "Failed to find decoder for stream #%u\n", i);
  
              return AVERROR_DECODER_NOT_FOUND;
  
          }
  
          codec_ctx = avcodec_alloc_context3(dec);
  
          if (!codec_ctx) {
  
              av_log(NULL, AV_LOG_ERROR, "Failed to allocate the decoder context for stream #%u\n", i);
  
              return AVERROR(ENOMEM);
  
          }
  
          ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Failed to copy decoder parameters to input decoder context "
  
                  "for stream #%u\n", i);
  
              return ret;
  
          }
  
          /* Reencode video &amp; audio and remux subtitles etc. */
  
          if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
  
              || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
              if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
  
                  codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, NULL);
  
              /* Open decoder */
  
              ret = avcodec_open2(codec_ctx, dec, NULL);
  
              if (ret &lt; 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
  
                  return ret;
  
              }
  
          }
  
          stream_ctx[i].dec_ctx = codec_ctx;
  
      }
  
  
  
      av_dump_format(ifmt_ctx, 0, filename, 0);
  
      return 0;
  
  }
  
  
  
  static int open_output_file(const char *filename, const int videoStreamIndex)
  
  {
  
      AVStream *out_stream;
  
      AVStream *in_stream;
  
      AVCodecContext *dec_ctx, *enc_ctx;
  
      AVCodec *encoder;
  
      int ret;
  
      unsigned int i;
  
  
  
      ofmt_ctx = NULL;
  
      avformat_alloc_output_context2(&amp;ofmt_ctx, NULL, NULL, filename);
  
      if (!ofmt_ctx) {
  
          av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
  
          return AVERROR_UNKNOWN;
  
      }
  
  
  
  
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
          // Just need video
  
          if (i != videoStreamIndex)
  
              continue;
  
  
  
          out_stream = avformat_new_stream(ofmt_ctx, NULL);
  
          if (!out_stream) {
  
              av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
  
              return AVERROR_UNKNOWN;
  
          }
  
  
  
          in_stream = ifmt_ctx->streams[i];
  
          dec_ctx = stream_ctx[i].dec_ctx;
  
  
  
          if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
  
              /* in this example, we choose transcoding to same codec */
  
              encoder = avcodec_find_encoder(dec_ctx->codec_id);
  
              if (!encoder) {
  
                  av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n");
  
                  return AVERROR_INVALIDDATA;
  
              }
  
              enc_ctx = avcodec_alloc_context3(encoder);
  
              if (!enc_ctx) {
  
                  av_log(NULL, AV_LOG_FATAL, "Failed to allocate the encoder context\n");
  
                  return AVERROR(ENOMEM);
  
              }
  
  
  
              /* In this example, we transcode to same properties (picture size,
  
              * sample rate etc.). These properties can be changed for output
  
              * streams easily using filters */
  
              enc_ctx->height = dec_ctx->height;
  
              enc_ctx->width = dec_ctx->width;
  
              enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
  
              /* take first format from list of supported formats */
  
              if (encoder->pix_fmts)
  
                  enc_ctx->pix_fmt = encoder->pix_fmts[0];
  
              else
  
                  enc_ctx->pix_fmt = dec_ctx->pix_fmt;
  
  
  
              /* video time_base can be set to whatever is handy and supported by encoder */
  
              //enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
  
              enc_ctx->time_base = dec_ctx->time_base;
  
  
  
  
  
              /* Third parameter can be used to pass settings to encoder */
  
              ret = avcodec_open2(enc_ctx, encoder, NULL);
  
              if (ret &lt; 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
  
                  return ret;
  
              }
  
              ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx);
  
              if (ret &lt; 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Failed to copy encoder parameters to output stream #%u\n", i);
  
                  return ret;
  
              }
  
              if (ofmt_ctx->oformat->flags &amp; AVFMT_GLOBALHEADER)
  
                  enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  
  
              out_stream->time_base = enc_ctx->time_base;
  
              stream_ctx[i].enc_ctx = enc_ctx;
  
          }
  
          else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
  
              av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
  
              return AVERROR_INVALIDDATA;
  
          }
  
          else {
  
              /* if this stream must be remuxed */
  
              ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
  
              if (ret &lt; 0) {
  
                  av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i);
  
                  return ret;
  
              }
  
              out_stream->time_base = in_stream->time_base;
  
          }
  
  
  
      }
  
      av_dump_format(ofmt_ctx, 0, filename, 1);
  
  
  
      if (!(ofmt_ctx->oformat->flags &amp; AVFMT_NOFILE)) {
  
          ret = avio_open(&amp;ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
  
              return ret;
  
          }
  
      }
  
  
  
      /* init muxer, write output file header */
  
      ret = avformat_write_header(ofmt_ctx, NULL);
  
      if (ret &lt; 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
  
          return ret;
  
      }
  
  
  
      return 0;
  
  }
  
  
  
  static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
  
      AVCodecContext *enc_ctx, const char *filter_spec)
  
  {
  
      char args[512];
  
      int ret = 0;
  
      AVFilter *buffersrc = NULL;
  
      AVFilter *buffersink = NULL;
  
      AVFilterContext *buffersrc_ctx = NULL;
  
      AVFilterContext *buffersink_ctx = NULL;
  
      AVFilterInOut *outputs = avfilter_inout_alloc();
  
      AVFilterInOut *inputs = avfilter_inout_alloc();
  
      AVFilterGraph *filter_graph = avfilter_graph_alloc();
  
  
  
      if (!outputs || !inputs || !filter_graph) {
  
          ret = AVERROR(ENOMEM);
  
          goto end;
  
      }
  
  
  
      if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
  
          buffersrc = avfilter_get_by_name("buffer");
  
          buffersink = avfilter_get_by_name("buffersink");
  
          if (!buffersrc || !buffersink) {
  
              av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
  
              ret = AVERROR_UNKNOWN;
  
              goto end;
  
          }
  
  
  
          snprintf(args, sizeof(args),
  
              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
  
              dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
  
              dec_ctx->time_base.num, dec_ctx->time_base.den,
  
              dec_ctx->sample_aspect_ratio.num,
  
              dec_ctx->sample_aspect_ratio.den);
  
  
  
          ret = avfilter_graph_create_filter(&amp;buffersrc_ctx, buffersrc, "in",
  
              args, NULL, filter_graph);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
  
              goto end;
  
          }
  
  
  
          ret = avfilter_graph_create_filter(&amp;buffersink_ctx, buffersink, "out",
  
              NULL, NULL, filter_graph);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
  
              goto end;
  
          }
  
  
  
          ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
  
              (uint8_t*)&amp;enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
  
              AV_OPT_SEARCH_CHILDREN);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
  
              goto end;
  
          }
  
      }
  
      else {
  
          ret = AVERROR_UNKNOWN;
  
          goto end;
  
      }
  
  
  
      /* Endpoints for the filter graph. */
  
      outputs->name = av_strdup("in");
  
      outputs->filter_ctx = buffersrc_ctx;
  
      outputs->pad_idx = 0;
  
      outputs->next = NULL;
  
  
  
      inputs->name = av_strdup("out");
  
      inputs->filter_ctx = buffersink_ctx;
  
      inputs->pad_idx = 0;
  
      inputs->next = NULL;
  
  
  
      if (!outputs->name || !inputs->name) {
  
          ret = AVERROR(ENOMEM);
  
          goto end;
  
      }
  
  
  
      if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
  
          &amp;inputs, &amp;outputs, NULL)) &lt; 0)
  
          goto end;
  
  
  
      if ((ret = avfilter_graph_config(filter_graph, NULL)) &lt; 0)
  
          goto end;
  
  
  
      /* Fill FilteringContext */
  
      fctx->buffersrc_ctx = buffersrc_ctx;
  
      fctx->buffersink_ctx = buffersink_ctx;
  
      fctx->filter_graph = filter_graph;
  
  
  
  end:
  
      avfilter_inout_free(&amp;inputs);
  
      avfilter_inout_free(&amp;outputs);
  
  
  
      return ret;
  
  }
  
  
  
  static int init_filters(const int videoStreamIndex)
  
  {
  
      const char *filter_spec;
  
      unsigned int i;
  
      int ret;
  
      filter_ctx = (FilteringContext*)av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx));
  
      if (!filter_ctx)
  
          return AVERROR(ENOMEM);
  
  
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
  
  
          // Just video
  
          if (i != videoStreamIndex)
  
              continue;
  
  
  
          filter_ctx[i].buffersrc_ctx = NULL;
  
          filter_ctx[i].buffersink_ctx = NULL;
  
          filter_ctx[i].filter_graph = NULL;
  
          if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
  
              || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
  
              continue;
  
  
  
          filter_spec = "null"; /* passthrough (dummy) filter for video */
  
          //filter_spec = "scale=w=iw/2:-1";
  
          // filter_spec = "drawtext=fontfile=FreeSerif.ttf: text='%{localtime}': x=w-text_w: y=0: fontsize=24: fontcolor=yellow@1.0: box=1: boxcolor=red@1.0";
  
          // filter_spec = "drawtext=fontfile=FreeSerif.ttf :text='test': x=w-text_w: y=text_h: fontsize=24: fontcolor=yellow@1.0: box=1: boxcolor=red@1.0";
  
  
  
          ret = init_filter(&amp;filter_ctx[i], stream_ctx[i].dec_ctx,
  
              stream_ctx[i].enc_ctx, filter_spec);
  
          if (ret)
  
              return ret;
  
      }
  
      return 0;
  
  }
  
  
  
  static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame, const int videoStreamIndex) {
  
  
  
      // Just video
  
      if (stream_index != videoStreamIndex)
  
          return 0;
  
  
  
      int ret;
  
      int got_frame_local;
  
      AVPacket enc_pkt;
  
      int(*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
  
          (ifmt_ctx->streams[stream_index]->codecpar->codec_type ==
  
              AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
  
  
  
      if (!got_frame)
  
          got_frame = &amp;got_frame_local;
  
  
  
      // av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
  
      /* encode filtered frame */
  
      enc_pkt.data = NULL;
  
      enc_pkt.size = 0;
  
      av_init_packet(&amp;enc_pkt);
  
  
  
      ret = enc_func(stream_ctx[stream_index].enc_ctx, &amp;enc_pkt,
  
          filt_frame, got_frame);
  
  
  
      av_frame_free(&amp;filt_frame);
  
      if (ret &lt; 0)
  
          return ret;
  
      if (!(*got_frame))
  
          return 0;
  
  
  
      /* prepare packet for muxing */
  
      /*enc_pkt.stream_index = stream_index;
  
      av_packet_rescale_ts(&amp;enc_pkt, stream_ctx[stream_index].enc_ctx->time_base, ofmt_ctx->streams[stream_index]->time_base);*/
  
      enc_pkt.stream_index = 0;
  
      av_packet_rescale_ts(&amp;enc_pkt, stream_ctx[stream_index].enc_ctx->time_base, ofmt_ctx->streams[0]->time_base);
  
  
  
      av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
  
      /* mux encoded frame */
  
      ret = av_interleaved_write_frame(ofmt_ctx, &amp;enc_pkt);
  
      return ret;
  
  }
  
  
  
  static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index, const int videoStreamIndex)
  
  {
  
      // Just video, all else crashes
  
      if (stream_index != videoStreamIndex)
  
          return 0;
  
  
  
      int ret;
  
      AVFrame *filt_frame;
  
  
  
      // av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
  
      /* push the decoded frame into the filtergraph */
  
      ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
  
          frame, 0);
  
      if (ret &lt; 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
  
          return ret;
  
      }
  
  
  
      /* pull filtered frames from the filtergraph */
  
      while (1) {
  
          filt_frame = av_frame_alloc();
  
          if (!filt_frame) {
  
              ret = AVERROR(ENOMEM);
  
              break;
  
          }
  
          // av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
  
          ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
  
              filt_frame);
  
          if (ret &lt; 0) {
  
              /* if no more frames for output - returns AVERROR(EAGAIN)
  
              * if flushed and no more frames for output - returns AVERROR_EOF
  
              * rewrite retcode to 0 to show it as normal procedure completion
  
              */
  
              if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
  
                  ret = 0;
  
              av_frame_free(&amp;filt_frame);
  
              break;
  
          }
  
  
  
          filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
  
          ret = encode_write_frame(filt_frame, stream_index, NULL, videoStreamIndex);
  
          if (ret &lt; 0)
  
              break;
  
      }
  
  
  
      return ret;
  
  }
  
  
  
  static int flush_encoder(unsigned int stream_index, const int videoStreamIndex)
  
  {
  
      int ret;
  
      int got_frame;
  
  
  
      // Just video
  
      if (stream_index != videoStreamIndex)
  
          return 0;
  
  
  
      if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities &amp;
  
          AV_CODEC_CAP_DELAY))
  
          return 0;
  
  
  
      while (1) {
  
          av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
  
          ret = encode_write_frame(NULL, stream_index, &amp;got_frame, videoStreamIndex);
  
          if (ret &lt; 0)
  
              break;
  
          if (!got_frame)
  
              return 0;
  
      }
  
      return ret;
  
  }
  
  
  
  
  
  #include <vector>
  
  
  
  int main(int argc, char **argv)
  
  {
  
      int ret;
  
  
  
      AVPacket packet;
  
      packet.data = NULL;
  
      packet.size = 0;
  
  
  
      AVFrame *frame = NULL;
  
      enum AVMediaType type;
  
      unsigned int stream_index;
  
      unsigned int i;
  
      int got_frame;
  
      int(*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
  
  
  
  
  
  #ifdef _DEBUG
  
      // Hardcoded arguments
  
      std::vector varguments;
  
      {
  
          varguments.push_back(argv[0]);
  
  
  
          // Source
  
          varguments.push_back("./big_buck_bunny_short.mp4 ");
  
  
  
          // Destination
  
          varguments.push_back("./big_buck_bunny_short-processed.mp4");
  
      }
  
  
  
      char** arguments = new char*[varguments.size()];
  
      for (unsigned int i = 0; i &lt; varguments.size(); i++)
  
      {
  
          arguments[i] = varguments[i];
  
      }
  
      argc = varguments.size();
  
      argv = arguments;
  
  #endif // _DEBUG
  
  
  
  
  
      if (argc != 3) {
  
          av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file="file" /> <output file="file">\n", argv[0]);
  
          return 1;
  
      }
  
  
  
      av_register_all();
  
      avfilter_register_all();
  
  
  
      int videoStreamIndex = -1;
  
      if ((ret = open_input_file(argv[1], videoStreamIndex)) &lt; 0)
  
          goto end;
  
      if ((ret = open_output_file(argv[2], videoStreamIndex)) &lt; 0)
  
          goto end;
  
      if ((ret = init_filters(videoStreamIndex)) &lt; 0)
  
          goto end;
  
  
  
      // Stop after a couple of frames
  
      int framesToGet = 100;
  
  
  
      /* read all packets */
  
      //while (framesToGet--)
  
      while(1)
  
      {
  
          if ((ret = av_read_frame(ifmt_ctx, &amp;packet)) &lt; 0)
  
              break;
  
          stream_index = packet.stream_index;
  
  
  
          // I just need video
  
          if (stream_index != videoStreamIndex) {
  
              av_packet_unref(&amp;packet);
  
              continue;
  
          }
  
  
  
          type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
  
          av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
  
              stream_index);
  
  
  
          if (filter_ctx[stream_index].filter_graph) {
  
              av_log(NULL, AV_LOG_DEBUG, "Going to reencode&amp;filter the frame\n");
  
              frame = av_frame_alloc();
  
              if (!frame) {
  
                  ret = AVERROR(ENOMEM);
  
                  break;
  
              }
  
              av_packet_rescale_ts(&amp;packet,
  
                  ifmt_ctx->streams[stream_index]->time_base,
  
                  stream_ctx[stream_index].dec_ctx->time_base);
  
              dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 :
  
                  avcodec_decode_audio4;
  
              ret = dec_func(stream_ctx[stream_index].dec_ctx, frame,
  
                  &amp;got_frame, &amp;packet);
  
              if (ret &lt; 0) {
  
                  av_frame_free(&amp;frame);
  
                  av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
  
                  break;
  
              }
  
  
  
              if (got_frame) {
  
                  frame->pts = frame->best_effort_timestamp;
  
                  ret = filter_encode_write_frame(frame, stream_index, videoStreamIndex);
  
                  av_frame_free(&amp;frame);
  
                  if (ret &lt; 0)
  
                      goto end;
  
              }
  
              else {
  
                  av_frame_free(&amp;frame);
  
              }
  
          }
  
          else {
  
              /* remux this frame without reencoding */
  
              av_packet_rescale_ts(&amp;packet,
  
                  ifmt_ctx->streams[stream_index]->time_base,
  
                  ofmt_ctx->streams[stream_index]->time_base);
  
  
  
              ret = av_interleaved_write_frame(ofmt_ctx, &amp;packet);
  
              if (ret &lt; 0)
  
                  goto end;
  
          }
  
          av_packet_unref(&amp;packet);
  
      }
  
  
  
      /* flush filters and encoders */
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
          /* flush filter */
  
          if (!filter_ctx[i].filter_graph)
  
              continue;
  
          ret = filter_encode_write_frame(NULL, i, videoStreamIndex);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
  
              goto end;
  
          }
  
  
  
          /* flush encoder */
  
          ret = flush_encoder(i, videoStreamIndex);
  
          if (ret &lt; 0) {
  
              av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
  
              goto end;
  
          }
  
      }
  
  
  
      av_write_trailer(ofmt_ctx);
  
  end:
  
      av_packet_unref(&amp;packet);
  
      av_frame_free(&amp;frame);
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
          // Just video
  
          if (i != videoStreamIndex)
  
              continue;
  
          avcodec_free_context(&amp;stream_ctx[i].dec_ctx);
  
          if (ofmt_ctx &amp;&amp; ofmt_ctx->nb_streams > i &amp;&amp; ofmt_ctx->streams[i] &amp;&amp; stream_ctx[i].enc_ctx)
  
              avcodec_free_context(&amp;stream_ctx[i].enc_ctx);
  
          if (filter_ctx &amp;&amp; filter_ctx[i].filter_graph)
  
              avfilter_graph_free(&amp;filter_ctx[i].filter_graph);
  
      }
  
      av_free(filter_ctx);
  
      av_free(stream_ctx);
  
      avformat_close_input(&amp;ifmt_ctx);
  
      if (ofmt_ctx &amp;&amp; !(ofmt_ctx->oformat->flags &amp; AVFMT_NOFILE))
  
          avio_closep(&amp;ofmt_ctx->pb);
  
      avformat_free_context(ofmt_ctx);
  
  
  
      /*if (ret &lt; 0)
  
          av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));*/
  
  
  
      return ret ? 1 : 0;
  
  }
  
  </output></vector>

• Announcing Long Term Support in Piwik 2 – The analytics platform for your mission critical projects

  11 janvier 2016, par Matthieu Aubry — About, Development

  We are proud to announce our Long Term Support (LTS) for Piwik 2.X !

  Why Long Term Support (LTS) ?

  Part of our mission is to ready Piwik for the enterprise — and ready the enterprise for Piwik. Our fast release cycle and our ability to quickly innovate has served us well for the past seven years and has lead Piwik to being one of the most popular open source projects, used by over one million websites worldwide. But Piwik’s success today has also shown us that this fast release cycle is not suited for all users and customers. Like most large open source projects (such as Ubuntu, Firefox, Debian, Symfony, Node.js, etc.) at Piwik we now also offer a Long Term Support release which gives users the confidence that Piwik can be used for mission critical projects for months to come.

  What does LTS mean for Piwik ?

  For the duration of the LTS period, Piwik 2.X will continue to receive the following fixes :

  • Critical bugs causing data loss or data corruption.
  • Major and Critical security issues.

  Our goal is to offer you a Piwik LTS release that you can trust for all your mission critical projects.

  How long will Piwik 2.X be supported ?

  Piwik 2.X will be supported for at least 12 months after the initial release of Piwik 3.0.0.
  Piwik 3.0.0 is expected to be released in the second half of 2016.
  This means that Piwik 2.X will be supported at least until the second half of 2017.

  Which Piwik version is LTS ?

  The latest Piwik 2.16.X release is our Long Term Support version.

  How do I benefit from the LTS version ?

  To get the full benefits of Piwik LTS, please make sure you are using the latest LTS version. First, update to the latest Piwik 2.X version, then Configure Piwik to use the LTS release channel and then update to the latest LTS version.

  How do I configure Piwik to use the LTS version ?

  By default, Piwik will not use the LTS version. When you use the one-click update your Piwik instance will be updated to the very latest release : when Piwik 3.0.0 will be released, the one click update will update your instance to 3.0.0. It is however possible to configure your Piwik so that you will stay on Piwik 2.X and keep using the LTS Long Term Support version :

  • Login Piwik as the Super User,
  • Go to Settings > General > Update settings,
  • Under “Release channel” click “Latest stable 2.X Long Term Support version”, and click “Save”.
    

  How do I get professional Piwik Support ?

  If you need professional support for your Piwik service get in touch with the Piwik experts.

  ---

  For other questions, feedback or discussion, feel free to join our forums and comment on this LTS forum post.

  We wish you all a fantastic year 2016 !