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• swresample : do not put multiple statements in one line

  16 octobre 2014, par Michael Niedermayer

  swresample : do not put multiple statements in one line
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libswresample/swresample.c

• What am I doing wrong with my audio writing in ffmpeg ? [on hold]

  12 septembre 2014, par Michael Nguyen

  I’m trying to splice multiple video sources into one. I’m having trouble understanding the audio portion of it. Rather I should say, the audio part of my code doesn’t seem to work. I don’t understand it. Could somebody help me understand what I am doing wrong ? The method doing all the work is called renderMovieRequest

  Thanks in advance.

  My entire code can be found here : http://pastebin.com/rAZkU3XZ

  Any help would be appreciated.
  below is a snippet of the code (it’s too long otherwise)

  int64_t timeBase;
  
  bool seek(AVFormatContext *pFormatCtx, int frameIndex){
  
  
  
      if(!pFormatCtx)
  
          return false;
  
  
  
      int64_t seekTarget = int64_t(frameIndex) * timeBase;
  
  
  
      if(av_seek_frame(pFormatCtx, -1, seekTarget, AVSEEK_FLAG_ANY) < 0) {
  
          ELOG("av_seek_frame failed.");
  
          return false;
  
      }
  
  
  
      return true;
  
  
  
  }
  
  
  
  typedef struct OutputStream {
  
      AVStream *st;
  
      /* pts of the next frame that will be generated */
  
      int64_t next_pts;
  
      int samples_count;
  
      AVFrame *frame;
  
      AVFrame *tmp_frame;
  
      float t, tincr, tincr2;
  
      struct SwsContext *sws_ctx;
  
      struct SwrContext *swr_ctx;
  
  } OutputStream;
  
  
  
  
  
  static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
  
  {
  
      /* rescale output packet timestamp values from codec to stream timebase */
  
      av_packet_rescale_ts(pkt, *time_base, st->time_base);
  
      pkt->stream_index = st->index;
  
      /* Write the compressed frame to the media file. */
  
      log_packet(fmt_ctx, pkt);
  
      return av_interleaved_write_frame(fmt_ctx, pkt);
  
  }
  
  /* Add an output stream. */
  
  static void add_stream(OutputStream *ost, AVFormatContext *oc,
  
                         AVCodec **codec,
  
                         enum AVCodecID codec_id) {
  
      AVCodecContext *c;
  
      int i;
  
      /* find the encoder */
  
      *codec = avcodec_find_encoder(codec_id);
  
      if (!(*codec)) {
  
          ELOG("Could not find encoder for '%s'\n", avcodec_get_name(codec_id));
  
          return;
  
      }
  
      ost->st = avformat_new_stream(oc, *codec);
  
      if (!ost->st) {
  
          ELOG("Could not allocate stream\n");
  
          return;
  
      }
  
      ost->st->id = oc->nb_streams-1;
  
      c = ost->st->codec;
  
      switch ((*codec)->type) {
  
      case AVMEDIA_TYPE_AUDIO:
  
          c->sample_fmt  = (*codec)->sample_fmts ?
  
              (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
  
          c->bit_rate    = 64000;
  
          c->sample_rate = 44100;
  
          if ((*codec)->supported_samplerates) {
  
              c->sample_rate = (*codec)->supported_samplerates[0];
  
              for (i = 0; (*codec)->supported_samplerates[i]; i++) {
  
                  if ((*codec)->supported_samplerates[i] == 44100)
  
                      c->sample_rate = 44100;
  
              }
  
          }
  
          c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);
  
          c->channel_layout = AV_CH_LAYOUT_STEREO;
  
          if ((*codec)->channel_layouts) {
  
              c->channel_layout = (*codec)->channel_layouts[0];
  
              for (i = 0; (*codec)->channel_layouts[i]; i++) {
  
                  if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
  
                      c->channel_layout = AV_CH_LAYOUT_STEREO;
  
              }
  
          }
  
          c->channels        = av_get_channel_layout_nb_channels(c->channel_layout);
  
          ost->st->time_base = (AVRational){ 1, c->sample_rate };
  
          break;
  
      case AVMEDIA_TYPE_VIDEO:
  
          c->codec_id = codec_id;
  
          c->bit_rate = 400000;
  
          /* Resolution must be a multiple of two. */
  
  //        c->width    = 352;
  
  //        c->height   = 288;
  
          c->width    = 1280;
  
          c->height   = 720;
  
  
  
          /* timebase: This is the fundamental unit of time (in seconds) in terms
  
           * of which frame timestamps are represented. For fixed-fps content,
  
           * timebase should be 1/framerate and timestamp increments should be
  
           * identical to 1. */
  
          ost->st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
  
          c->time_base       = ost->st->time_base;
  
          c->gop_size      = 12; /* emit one intra frame every twelve frames at most */
  
          c->pix_fmt       = STREAM_PIX_FMT;
  
          if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
  
              /* just for testing, we also add B frames */
  
              c->max_b_frames = 2;
  
          }
  
          if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
  
              /* Needed to avoid using macroblocks in which some coeffs overflow.
  
               * This does not happen with normal video, it just happens here as
  
               * the motion of the chroma plane does not match the luma plane. */
  
              c->mb_decision = 2;
  
          }
  
      break;
  
      default:
  
          break;
  
      }
  
      /* Some formats want stream headers to be separate. */
  
      if (oc->oformat->flags & AVFMT_GLOBALHEADER)
  
          c->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  
  
  /**************************************************************/
  
  /* audio output */
  
  static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
  
                                    uint64_t channel_layout,
  
                                    int sample_rate, int nb_samples)
  
  {
  
      AVFrame *frame = av_frame_alloc();
  
      int ret;
  
      if (!frame) {
  
          fprintf(stderr, "Error allocating an audio frame\n");
  
          exit(1);
  
      }
  
      frame->format = sample_fmt;
  
      frame->channel_layout = channel_layout;
  
      frame->sample_rate = sample_rate;
  
      frame->nb_samples = nb_samples;
  
      if (nb_samples) {
  
          ret = av_frame_get_buffer(frame, 0);
  
          if (ret < 0) {
  
              fprintf(stderr, "Error allocating an audio buffer\n");
  
              exit(1);
  
          }
  
      }
  
      return frame;
  
  }
  
  static int open_audio(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
  
  {
  
      AVCodecContext *c;
  
      int nb_samples;
  
      int ret;
  
      AVDictionary *opt = NULL;
  
      c = ost->st->codec;
  
      /* open it */
  
      av_dict_copy(&opt, opt_arg, 0);
  
      ret = avcodec_open2(c, codec, &opt);
  
      av_dict_free(&opt);
  
      if (ret < 0) {
  
          ELOG("Could not open audio codec: %s\n", av_err2str(ret));
  
          return ret;
  
      }
  
      /* init signal generator */
  
      ost->t     = 0;
  
      ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
  
      /* increment frequency by 110 Hz per second */
  
      ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
  
      if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
  
          nb_samples = 10000;
  
      else
  
          nb_samples = c->frame_size;
  
      ost->frame     = alloc_audio_frame(c->sample_fmt, c->channel_layout,
  
                                         c->sample_rate, nb_samples);
  
      ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, c->channel_layout,
  
                                         c->sample_rate, nb_samples);
  
      /* create resampler context */
  
          ost->swr_ctx = swr_alloc();
  
          if (!ost->swr_ctx) {
  
              ELOG("Could not allocate resampler context\n");
  
              return -300;
  
          }
  
          /* set options */
  
          av_opt_set_int       (ost->swr_ctx, "in_channel_count",   c->channels,       0);
  
          av_opt_set_int       (ost->swr_ctx, "in_sample_rate",     c->sample_rate,    0);
  
          av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt",      AV_SAMPLE_FMT_S16, 0);
  
          av_opt_set_int       (ost->swr_ctx, "out_channel_count",  c->channels,       0);
  
          av_opt_set_int       (ost->swr_ctx, "out_sample_rate",    c->sample_rate,    0);
  
          av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt",     c->sample_fmt,     0);
  
          /* initialize the resampling context */
  
          if ((ret = swr_init(ost->swr_ctx)) < 0) {
  
              ELOG("Failed to initialize the resampling context: %i\n", ret);
  
              return ret;
  
          }
  
  
  
          return 0;
  
  }
  
  
  
  /*
  
   * encode one audio frame and send it to the muxer
  
   * return 1 when encoding is finished, 0 otherwise
  
   */
  
  static int write_audio_frame(AVFormatContext *oc, OutputStream *ost, AVFrame *frame)
  
  {
  
      AVCodecContext *c;
  
      AVPacket pkt = { 0 }; // data and size must be 0;
  
  //    AVFrame *frame;
  
      int ret;
  
      int got_packet;
  
      int dst_nb_samples;
  
      av_init_packet(&pkt);
  
      c = ost->st->codec;
  
  //    frame = get_audio_frame(ost);
  
      if (frame) {
  
          /* convert samples from native format to destination codec format, using the resampler */
  
              /* compute destination number of samples */
  
              dst_nb_samples = av_rescale_rnd(swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples,
  
                                              c->sample_rate, c->sample_rate, AV_ROUND_UP);
  
              av_assert0(dst_nb_samples == frame->nb_samples);
  
          /* when we pass a frame to the encoder, it may keep a reference to it
  
           * internally;
  
           * make sure we do not overwrite it here
  
           */
  
          ret = av_frame_make_writable(ost->frame);
  
          if (ret < 0) {
  
              ELOG("Unable to prepare frame for writing: Error code: %s", av_err2str(ret));
  
              return ret;
  
          }
  
              /* convert to destination format */
  
              ret = swr_convert(ost->swr_ctx,
  
                                ost->frame->data, dst_nb_samples,
  
                                (const uint8_t **)frame->data, frame->nb_samples);
  
              if (ret < 0) {
  
                  ELOG("Error while converting: %s\n", av_err2str(ret));
  
                  return -1;
  
              }
  
              frame = ost->frame;
  
          frame->pts = av_rescale_q(ost->samples_count, (AVRational){1, c->sample_rate}, c->time_base);
  
          ost->samples_count += dst_nb_samples;
  
      }
  
      ret = avcodec_encode_audio2(c, &pkt, frame, &got_packet);
  
      if (ret < 0) {
  
          ELOG("Error encoding audio frame: %s\n", av_err2str(ret));
  
          return -1;
  
      }
  
      if (got_packet) {
  
          ret = write_frame(oc, &c->time_base, ost->st, &pkt);
  
          if (ret < 0) {
  
              ELOG( "Error while writing audio frame: %s\n", av_err2str(ret));
  
              return -1;
  
          }
  
      }
  
      return (frame || got_packet) ? 0 : 1;
  
  }
  
  
  
  
  
  /**************************************************************/
  
  /* video output */
  
  static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
  
  {
  
      AVFrame *picture;
  
      int ret;
  
      picture = av_frame_alloc();
  
      if (!picture)
  
          return NULL;
  
      picture->format = pix_fmt;
  
      picture->width  = width;
  
      picture->height = height;
  
      /* allocate the buffers for the frame data */
  
      ret = av_frame_get_buffer(picture, 32);
  
      if (ret < 0) {
  
          fprintf(stderr, "Could not allocate frame data.\n");
  
          exit(1);
  
      }
  
      return picture;
  
  }
  
  
  
  
  
  static int open_video(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
  
  {
  
      int ret;
  
      AVCodecContext *c = ost->st->codec;
  
      AVDictionary *opt = NULL;
  
      av_dict_copy(&opt, opt_arg, 0);
  
      /* open the codec */
  
      ret = avcodec_open2(c, codec, &opt);
  
      av_dict_free(&opt);
  
  
  
      if (ret < 0) {
  
          ELOG("Could not open video codec: %s\n", av_err2str(ret));
  
          return ret;
  
      }
  
      /* allocate and init a re-usable frame */
  
      DLOG("Allocate and init a are-usable frame: %i x %i Format: %i", c->width, c->height, c->pix_fmt);
  
      ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
  
      if (!ost->frame) {
  
          ELOG("Could not allocate video frame\n");
  
          return -100;
  
      }
  
  
  
      /* If the output format is not YUV420P, then a temporary YUV420P
  
       * picture is needed too. It is then converted to the required
  
       * output format. */
  
      ost->tmp_frame = NULL;
  
      if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
  
          DLOG("input format is not YUV420P converting to size %i x %i", c->width, c->height);
  
          ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
  
          if (!ost->tmp_frame) {
  
              ELOG("Could not allocate temporary picture\n");
  
              return -200;
  
          }
  
      }
  
  
  
      return 0;
  
  }
  
  
  
  /*
  
   * encode one video frame and send it to the muxer
  
   * return 1 when encoding is finished, 0 otherwise
  
   */
  
  static int write_video_frame(AVFormatContext *oc, OutputStream *ost, AVFrame *frame)
  
  {
  
      int ret;
  
      AVCodecContext *c;
  
      int got_packet = 0;
  
      c = ost->st->codec;
  
  
  
      if (oc->oformat->flags & AVFMT_RAWPICTURE) {
  
          /* a hack to avoid data copy with some raw video muxers */
  
          AVPacket pkt;
  
          av_init_packet(&pkt);
  
          if (!frame)
  
              return 1;
  
          pkt.flags        |= AV_PKT_FLAG_KEY;
  
          pkt.stream_index  = ost->st->index;
  
          pkt.data          = (uint8_t *)frame;
  
          pkt.size          = sizeof(AVPicture);
  
          pkt.pts = pkt.dts = frame->pts;
  
          av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
  
          ret = av_interleaved_write_frame(oc, &pkt);
  
      } else {
  
          AVPacket pkt = { 0 };
  
          av_init_packet(&pkt);
  
          /* encode the image */
  
          ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
  
          if (ret < 0) {
  
              fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  
              exit(1);
  
          }
  
          if (got_packet) {
  
              ret = write_frame(oc, &c->time_base, ost->st, &pkt);
  
          } else {
  
              ret = 0;
  
          }
  
      }
  
      if (ret < 0) {
  
          fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
      return (frame || got_packet) ? 0 : 1;
  
  }
  
  static void close_stream(AVFormatContext *oc, OutputStream *ost)
  
  {
  
      avcodec_close(ost->st->codec);
  
      av_frame_free(&ost->frame);
  
      av_frame_free(&ost->tmp_frame);
  
      sws_freeContext(ost->sws_ctx);
  
      swr_free(&ost->swr_ctx);
  
  }
  
  
  
  
  
  
  
  int renderMovieRequest(movieRequest *movieRequestObj, string outputPath) {
  
      AVOutputFormat *ofmt = NULL;
  
      AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
  
      AVFormatContext *pFormatCtx = NULL;
  
      AVCodec *audio_codec, *video_codec;
  
  
  
      OutputStream video_st = { 0 }, audio_st = { 0 };
  
      size_t            i;
  
      int             videoStream, audioStream;
  
      AVCodecContext  *pCodecCtx = NULL;
  
      AVCodec         *pCodec = NULL;
  
      AVFrame         *pFrame = NULL;
  
      AVFrame         *pFrameRGB = NULL;
  
      AVPacket        packet = { 0 };
  
      int             frameFinished;
  
      int             audioFrameFinished;
  
      int             numBytes;
  
      uint8_t         *buffer = NULL;
  
      AVDictionary    *optionsDict = NULL;
  
      AVDictionary *opt = NULL;
  
      struct SwsContext      *sws_ctx = NULL;
  
  
  
      const char *in_filename, *out_filename;
  
      int ret;
  
  
  
      int have_audio = 0, have_video = 0;
  
      int encode_audio = 0, encode_video = 0;
  
  
  
      processProtobuf(movieRequestObj);
  
  
  
      out_filename = outputPath.c_str();
  
  
  
      av_register_all();
  
  
  
      DLOG("attempting to create context for output file %s", out_filename);
  
  
  
      avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
  
      if (!ofmt_ctx) {
  
          ELOG("Could not create output context\n");
  
          ret = AVERROR_UNKNOWN;
  
          return ret; //goto end;
  
      }
  
      ofmt = ofmt_ctx->oformat;
  
  
  
     /* Add the audio and video streams using the default format codecs
  
         * and initialize the codecs. */
  
        if (ofmt->video_codec != AV_CODEC_ID_NONE) {
  
            add_stream(&video_st, ofmt_ctx, &video_codec, ofmt->video_codec);
  
            have_video = 1;
  
            encode_video = 1;
  
        }
  
        if (ofmt->audio_codec != AV_CODEC_ID_NONE) {
  
            add_stream(&audio_st, ofmt_ctx, &audio_codec, ofmt->audio_codec);
  
            have_audio = 1;
  
            encode_audio = 1;
  
        }
  
  
  
      DLOG("allocate encode buffers");
  
   /* Now that all the parameters are set, we can open the audio and
  
       * video codecs and allocate the necessary encode buffers. */
  
      if (have_video)
  
          open_video(ofmt_ctx, video_codec, &video_st, opt);
  
      if (have_audio) {
  
          DLOG("Opening audio codec");
  
          open_audio(ofmt_ctx, audio_codec, &audio_st, opt);
  
      }
  
  
  
      DLOG("open output file for writing");
  
     /* open the output file, if needed */
  
      if (!(ofmt->flags & AVFMT_NOFILE)) {
  
          ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
  
          if (ret < 0) {
  
              ELOG( "Could not open '%s': %s\n", out_filename, av_err2str(ret));
  
              return 1;
  
          }
  
      }
  
  
  
      /* Write the stream header, if any. */
  
      ret = avformat_write_header(ofmt_ctx, &opt);
  
      if (ret < 0) {
  
          ELOG("Error occurred when opening output file: %s\n", av_err2str(ret));
  
          return 1;
  
      }
  
  
  
      vector<clipshptr> * clips = &amp;(movieRequestObj->clips);
  
  
  
      DLOG("ready to process clips: %i", clips->size());
  
      for (size_t clipIdx = 0; clipIdx &lt; clips->size(); ++clipIdx) {
  
  
  
          shared_ptr<clip> currentClip = clips->at(clipIdx);
  
  
  
          switch (currentClip->getClipType()) {
  
              case VIDEO_CLIP: {
  
                  DLOG("clip is a video clip...");
  
  
  
                  shared_ptr<videoclip> vidClip = dynamic_pointer_cast<videoclip>(clips->at(clipIdx));
  
  
  
                  if (vidClip->shouldHaveSegments) {
  
                      // open the file for reading and create a temporary file for output
  
                      in_filename = vidClip->vidFileName.c_str();
  
                      DLOG("Opening %s for reading", in_filename);
  
  
  
                      if ((ret = avformat_open_input(&amp;ifmt_ctx, in_filename, 0, 0)) &lt; 0) {
  
                          ELOG("Could not open input file '%s'", in_filename);
  
                          return ret; //goto end;
  
                      }
  
  
  
                      if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) &lt; 0) {
  
                          ELOG("Failed to retrieve input stream information");
  
                          return ret; //goto end;
  
                      }
  
  
  
                      av_dump_format(ifmt_ctx, 0, in_filename, 0);
  
  
  
                      videoStream = -1;
  
                      audioStream = -1;
  
                      // setup input format context and output format context;
  
  //                    AVStream *video_in_stream = NULL;
  
                      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++) {
  
                          if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  
                              videoStream=i;
  
  //                            video_in_stream = ifmt_ctx->streams[i];
  
                          }
  
                          else if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
  
                              audioStream=i;
  
  //                            video_in_stream = ifmt_ctx->streams[i];
  
                          }
  
                      }
  
  
  
                      if (videoStream == -1) {
  
                          DLOG("not a video stream.");
  
                          continue;
  
                      }
  
  
  
                      // Get a pointer to the codec context for the video stream
  
                      pCodecCtx = ifmt_ctx->streams[videoStream]->codec;
  
                      if (pCodecCtx == NULL) {
  
                          ELOG("Error in getting pointer to codec for vidstream");
  
                      }
  
  
  
                      DLOG("Input pixel format: %i ", pCodecCtx->pix_fmt);
  
  
  
                      // Find the decoder for the video stream
  
                      pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
  
  
                      if(pCodec==NULL) {
  
                          ELOG("Unsupported codec!\n");
  
                          return -1; // Codec not found
  
                      }
  
                      // Open codec
  
                      if(avcodec_open2(pCodecCtx, pCodec, &amp;optionsDict)&lt;0) {
  
                          ELOG("Unable to open codec");
  
                          return -1; // Could not open codec
  
                      }
  
  
  
                      // get the timebase
  
                      timeBase = (int64_t(pCodecCtx->time_base.num) * AV_TIME_BASE) / int64_t(pCodecCtx->time_base.den);
  
  
  
                      // Allocate video frame
  
                      pFrame=av_frame_alloc();
  
  
  
                      // Allocate an AVFrame structure
  
                      pFrameRGB=av_frame_alloc();
  
                      if(pFrameRGB==NULL)
  
                          return -1;
  
  
  
                      // Determine required buffer size and allocate buffer
  
  //                    numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);
  
                      numBytes = avpicture_get_size(PIX_FMT_RGB24, movieRequestObj->width, movieRequestObj->height);
  
                      DLOG("Buffer size allocated: %i x %i: %i ", movieRequestObj->width, movieRequestObj->height, numBytes);
  
                      buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
  
  
  
                      sws_ctx = sws_getContext
  
                      (
  
                          pCodecCtx->width,
  
                          pCodecCtx->height,
  
                          pCodecCtx->pix_fmt,
  
                          movieRequestObj->width,
  
                          movieRequestObj->height,
  
                          PIX_FMT_RGB24,
  
                          SWS_BILINEAR,
  
                          NULL,
  
                          NULL,
  
                          NULL
  
                      );
  
  
  
                      // Assign appropriate parts of buffer to image planes in pFrameRGB
  
                      // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
  
                      // of AVPicture
  
                      avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, movieRequestObj->width, movieRequestObj->height);
  
                      size_t numSegments = vidClip->segments.size();
  
  
  
                      DLOG("Found %i segments to process", numSegments);
  
                      for (size_t segmentIdx = 0; segmentIdx &lt; numSegments; ++segmentIdx) {
  
                          // seek to the right position
  
                          int frameOffset = vidClip->segments.at(segmentIdx).first;
  
                          int clipDuration = vidClip->segments.at(segmentIdx).second;
  
                          DLOG("Starting Frame Number: %i Duration: %i", frameOffset, clipDuration);
  
  
  
                          seek(ifmt_ctx, frameOffset);
  
                          // loop for X frames where X is &lt; frameOffset + clipDuration; clipDuration is the length of the clip in terms of frames
  
                          for (int frameIdx = frameOffset; frameIdx &lt; (frameOffset + clipDuration); ++frameIdx) {
  
                              av_init_packet(&amp;packet);
  
                              int avReadResult = 0;
  
                              int continueRecording = 1;
  
                              while ((continueRecording == 1) &amp;&amp; (frameIdx &lt; (frameOffset + clipDuration) )) {
  
                                  avReadResult = av_read_frame(ifmt_ctx, &amp;packet);
  
                                  if(avReadResult != 0){
  
                                      if (avReadResult != AVERROR_EOF) {
  
                                          ELOG("av_read_frame error: %i", avReadResult );
  
                                      } else {
  
                                          ILOG("End of input file");
  
                                      }
  
                                      continueRecording = 0;
  
                                  }
  
                                  // Is this a packet from the video stream?
  
                                  if(packet.stream_index==videoStream) {
  
                                      // Decode video frame
  
                                      avcodec_decode_video2(pCodecCtx, pFrameRGB, &amp;frameFinished, &amp;packet);
  
  
  
                                      // Did we get a video frame?
  
                                      if(frameFinished) {
  
                                          // Convert the image from its native format to RGB
  
                                          sws_scale
  
                                          (
  
                                             sws_ctx,
  
                                             (uint8_t const * const *)pFrame->data,
  
                                             pFrame->linesize,
  
                                             0,
  
                                             pCodecCtx->height,
  
                                             pFrameRGB->data,
  
                                             pFrameRGB->linesize
  
                                          );
  
                                          write_video_frame(ofmt_ctx, &amp;video_st, pFrameRGB);
  
                                          frameIdx++;
  
                                      }
  
  
  
                                  }
  
                                  else if (packet.stream_index == audioStream) {
  
                                      // Decode audio frame
  
                                      DLOG("Audio frame found");
  
                                      avcodec_decode_audio4(pCodecCtx, pFrameRGB, &amp;audioFrameFinished, &amp;packet);
  
  
  
                                      if (audioFrameFinished) {
  
  //                                        write the audio frame to file
  
                                          write_audio_frame(ofmt_ctx, &amp;audio_st, pFrameRGB);
  
  
  
                                      }
  
  
  
                                  }
  
                                  // Free the packet that was allocated by av_read_frame
  
                                  av_free_packet(&amp;packet);
  
                              }
  
                                  // Free the RGB image
  
  
  
                          }
  
                      }
  
  
  
                      DLOG("Cleaning up frame allocations");
  
                      av_free(buffer);
  
                      av_free(pFrameRGB);
  
                      // Free the YUV frame
  
                      av_free(pFrame);
  
  
  
                  } // end video clip processing
  
              }
  
              break;
  
  
  
              case TITLE_CLIP: {
  
                }
  
              break;
  
  
  
              default:
  
                  ELOG("Failed to identify clip");
  
                  break;
  
          } // end switch statement
  
  
  
          DLOG("Finished processing clip #%i", clipIdx);
  
          avformat_close_input(&amp;ifmt_ctx);
  
      } // end main for loop -> clip iteration
  
  
  
  
  
   /* Write the trailer, if any. The trailer must be written before you
  
       * close the CodecContexts open when you wrote the header; otherwise
  
       * av_write_trailer() may try to use memory that was freed on
  
       * av_codec_close(). */
  
      av_write_trailer(ofmt_ctx);
  
  
  
      /* Close each codec. */
  
      if (have_video)
  
          close_stream(ofmt_ctx, &amp;video_st);
  
      if (have_audio)
  
          close_stream(ofmt_ctx, &amp;audio_st);
  
  
  
      if (ofmt_ctx &amp;&amp; !(ofmt->flags &amp; AVFMT_NOFILE)) {
  
          /* Close the output file. */
  
          avio_close(ofmt_ctx->pb);
  
      }
  
  
  
      DLOG("Closing input format context");
  
      avformat_close_input(&amp;ifmt_ctx);
  
  
  
      DLOG("Free ouptut format context");
  
      avformat_free_context(ofmt_ctx);
  
  
  
      if (ret &lt; 0 &amp;&amp; ret != AVERROR_EOF) {
  
          ELOG( "Error occurred: %s\n", av_err2str(ret));
  
          return 1;
  
      }
  
  
  
      return 0;
  
  }
  
  
  
  
  
  #ifdef __cplusplus
  
  }
  
  
  
  #endif
  
  </videoclip></videoclip></clip></clipshptr>

• FFMPEG command doesn't work in PHP, what am I doing wrong ?

  3 mars 2013, par Charlie Ryan

  I'm a bit of a beginner when it comes to PHP, and I'm trying to create a simple(ish) system where files are input, and then converted to html5 video in various resolutions.

  I've sorted out how to handle multiple file uploads etc, but now I'm having a problem.

  I can't seem to get exec to execute FFMPEG in PHP.

  For example, if I type this into my command line (Terminal on Mac OSX 10.8), It converts the video correctly :

  ffmpeg -i /Users/charlieryan/Desktop/MOV01785.MPG websample.mov

  This correctly outputs the converted video file into my home directory.

  However if I run this in PHP as follows :

  exec('ffmpeg -i /Users/charlieryan/Desktop/MOV01785.MPG websample.mov');

  Absolutely nothing happens ... my stat monitor doesn't register any change in processor use, and I can't find the output file anywhere on my system.

  Since I'm a bit of a noob at this, I'm assuming I'm doing something wrong, but what is it ?

  Thanks,

  Charlie