Recherche avancée

Sur d’autres sites (4219)

• Ajouter un moyen de voir la configuration de php

  27 septembre 2011

  Il peut être intéressant d’avoir dans la configuration un accès direct aux informations de configuration de PHP pour débugguer un site ...

  Pour ce faire, on va rajouté un onglet de configuration dans la partie "Configuration avancée" qui nous permettra en un coup de click d’avoir cette configuration visible.

  On ajoute donc une page ms_config qui montrera le résultat de

  phpinfo()

  et le tour sera joué.

• FFmpeg not honoring bitrate for different containers ?

  19 mars 2013, par Haleeq Usman

  I am attempting to encode a mp4 video file into a flv video. Here is what I am doing :

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  
  
  #define STREAM_FRAME_RATE 30 /* 30 images/s */
  
  #define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
  
  /**************************************************************/
  
  /* Add an output stream. */
  
  static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
  
          enum AVCodecID codec_id) {
  
      AVCodecContext *c;
  
      AVStream *st;
  
      /* find the encoder */
  
      *codec = avcodec_find_encoder(codec_id);
  
      if (!(*codec)) {
  
          fprintf(stderr, "Could not find encoder for &#39;%s&#39;\n",
  
                  avcodec_get_name(codec_id));
  
          exit(1);
  
      }
  
      st = avformat_new_stream(oc, *codec);
  
      if (!st) {
  
          fprintf(stderr, "Could not allocate stream\n");
  
          exit(1);
  
      }
  
      st->id = oc->nb_streams - 1;
  
      c = st->codec;
  
      switch ((*codec)->type) {
  
      case AVMEDIA_TYPE_VIDEO:
  
          //avcodec_get_context_defaults3(c, *codec);
  
          c->codec_id = codec_id;
  
          c->bit_rate = 150 * 1000; //2314000;;
  
          //c->rc_max_rate = 150*1000;
  
          //c->rc_buffer_size = 150*1000;
  
          /* Resolution must be a multiple of two. */
  
          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. */
  
          c->time_base.den = STREAM_FRAME_RATE;
  
          c->time_base.num = 1;
  
          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 &amp; AVFMT_GLOBALHEADER)
  
          c->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      return st;
  
  }
  
  /**************************************************************/
  
  /* video output */
  
  static AVFrame *frame;
  
  static AVPicture src_picture, dst_picture;
  
  static int frame_count;
  
  static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st) {
  
      int ret;
  
      AVCodecContext *c = st->codec;
  
      /* open the codec */
  
      ret = avcodec_open2(c, codec, NULL);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
      /* allocate and init a re-usable frame */
  
      frame = avcodec_alloc_frame();
  
      if (!frame) {
  
          fprintf(stderr, "Could not allocate video frame\n");
  
          exit(1);
  
      }
  
      /* Allocate the encoded raw picture. */
  
      ret = avpicture_alloc(&amp;dst_picture, c->pix_fmt, c->width, c->height);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
      /* If the output format is not YUV420P, then a temporary YUV420P
  
       * picture is needed too. It is then converted to the required
  
       * output format. */
  
      if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
  
          ret = avpicture_alloc(&amp;src_picture, AV_PIX_FMT_YUV420P, c->width,
  
                  c->height);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Could not allocate temporary picture: %s\n",
  
                      av_err2str(ret));
  
              exit(1);
  
          }
  
      }
  
      /* copy data and linesize picture pointers to frame */
  
      *((AVPicture *) frame) = dst_picture;
  
  }
  
  static void close_video(AVFormatContext *oc, AVStream *st) {
  
      avcodec_close(st->codec);
  
      av_free(src_picture.data[0]);
  
      av_free(dst_picture.data[0]);
  
      av_free(frame);
  
  }
  
  
  
  int main(int argc, char *argv[]) {
  
      AVFormatContext *pFormatCtx = NULL;
  
      int i, videoStream;
  
      AVCodecContext *pCodecCtx = NULL;
  
      AVCodec *pCodec;
  
      AVFrame *pFrame;
  
      AVPacket packet;
  
      int frameFinished;
  
  
  
      const char *filename;
  
      AVOutputFormat *fmt;
  
      AVFormatContext *oc;
  
      AVStream *video_st;
  
      AVCodec *video_codec;
  
      int ret;
  
  
  
      // Register all formats, codecs and network
  
      av_register_all();
  
      avcodec_register_all();
  
      avformat_network_init();
  
  
  
      // Open video file
  
      if (avformat_open_input(&amp;pFormatCtx, "input_file.mp4", NULL, NULL) != 0)
  
          return -1; // Couldn&#39;t open file
  
  
  
      // Retrieve stream information
  
      if (avformat_find_stream_info(pFormatCtx, NULL) &lt; 0)
  
          return -1; // Couldn&#39;t find stream information
  
  
  
      // Dump information about file onto standard error
  
      av_dump_format(pFormatCtx, 0, "input_file.mp4", 0);
  
  
  
      // Find the first video stream
  
      videoStream = -1;
  
      for (i = 0; i &lt; pFormatCtx->nb_streams; i++)
  
          if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
  
              videoStream = i;
  
              break;
  
          }
  
      if (videoStream == -1)
  
          return -1; // Didn&#39;t find a video stream
  
  
  
      // Get a pointer to the codec context for the video stream
  
      pCodecCtx = pFormatCtx->streams[videoStream]->codec;
  
  
  
      // Find the decoder for the video stream
  
      pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
  
      if (pCodec == NULL) {
  
          fprintf(stderr, "Unsupported codec!\n");
  
          return -1; // Codec not found
  
      }
  
      // Open codec
  
      if (avcodec_open2(pCodecCtx, pCodec, NULL) &lt; 0)
  
          return -1; // Could not open codec
  
  
  
      // Allocate video frame
  
      pFrame = avcodec_alloc_frame();
  
  
  
      // setup mux
  
      filename = "output_file.flv";
  
      fmt = av_guess_format("flv", filename, NULL);
  
      if (fmt == NULL) {
  
          printf("Could not guess format.\n");
  
          return -1;
  
      }
  
      // allocate the output media context
  
      oc = avformat_alloc_context();
  
      if (oc == NULL) {
  
          printf("could not allocate context.\n");
  
          return -1;
  
      }
  
      oc->oformat = fmt;
  
  
  
      // Add the video streams using the default format codecs
  
      // and initialize the codecs.
  
      video_st = NULL;
  
      if (fmt->video_codec != AV_CODEC_ID_NONE) {
  
          video_st = add_stream(oc, &amp;video_codec, fmt->video_codec);
  
      }
  
      // Now that all the parameters are set, we can open the
  
      // video codec and allocate the necessary encode buffers.
  
      if (video_st)
  
          open_video(oc, video_codec, video_st);
  
  
  
      /* open the output file, if needed */
  
      if (!(fmt->flags &amp; AVFMT_NOFILE)) {
  
          ret = avio_open(&amp;oc->pb, filename, AVIO_FLAG_WRITE);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Could not open &#39;%s&#39;: %s\n", filename,
  
                      av_err2str(ret));
  
              return 1;
  
          }
  
      }
  
  
  
      // dump output format
  
      av_dump_format(oc, 0, filename, 1);
  
  
  
      // Write the stream header, if any.
  
      ret = avformat_write_header(oc, NULL);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Error occurred when opening output file: %s\n",
  
                  av_err2str(ret));
  
          return 1;
  
      }
  
  
  
      // Read frames, decode, and re-encode
  
      while (av_read_frame(pFormatCtx, &amp;packet) >= 0) {
  
          // Is this a packet from the video stream?
  
          if (packet.stream_index == videoStream) {
  
              // Decode video frame
  
              avcodec_decode_video2(pCodecCtx, pFrame, &amp;frameFinished, &amp;packet);
  
  
  
              // Did we get a video frame?
  
              if (frameFinished) {
  
  
  
                  AVFrame* newFrame = avcodec_alloc_frame(); // Initialize a new frame
  
                  int size = avpicture_get_size(video_st->codec->pix_fmt,
  
                          video_st->codec->width, video_st->codec->height);
  
                  uint8_t* picture_buf = av_malloc(size);
  
  
  
                  avpicture_fill((AVPicture *) newFrame, picture_buf,
  
                          video_st->codec->pix_fmt, video_st->codec->width,
  
                          video_st->codec->height);
  
  
  
                  // Copy only the frame content without any other disturbing
  
                  av_picture_copy((AVPicture*) newFrame, (AVPicture*) pFrame,
  
                          video_st->codec->pix_fmt, video_st->codec->width,
  
                          video_st->codec->height);
  
  
  
                  // encode the image
  
                  AVPacket pkt;
  
                  int got_output;
  
                  av_init_packet(&amp;pkt);
  
                  pkt.data = NULL; // packet data will be allocated by the encoder
  
                  pkt.size = 0;
  
  
  
                  /* Setting newFrame->pts this way produces the error &#39;non-strictly-monotonic PTS&#39; */
  
                  //if(newFrame->pts != AV_NOPTS_VALUE)
  
                  //newFrame->pts = av_rescale_q(newFrame->pts, video_st->time_base, video_st->codec->time_base);
  
  
  
                  // Setting newFrame->pts this does not produce &#39;non-strictly-monotonic PTS&#39;
  
                  newFrame->pts = frame_count;
  
  
  
                  ret = avcodec_encode_video2(video_st->codec, &amp;pkt, newFrame, &amp;got_output);
  
                  if (ret &lt; 0) {
  
                      fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  
                      exit(1);
  
                  }
  
  
  
                  if (got_output) {
  
                      if (video_st->codec->coded_frame->key_frame)
  
                      pkt.flags |= AV_PKT_FLAG_KEY;
  
                      pkt.stream_index = video_st->index;
  
  
  
                      if (pkt.pts != AV_NOPTS_VALUE)
  
                          pkt.pts = av_rescale_q(pkt.pts,
  
                                  video_st->codec->time_base,
  
                                  video_st->time_base);
  
                      if (pkt.dts != AV_NOPTS_VALUE)
  
                          pkt.dts = av_rescale_q(pkt.dts,
  
                                  video_st->codec->time_base,
  
                                  video_st->time_base);
  
  
  
                      // Write the compressed frame to the media file.
  
                      ret = av_interleaved_write_frame(oc, &amp;pkt);
  
                  } 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(picture_buf);
  
                  av_free_packet(&amp;pkt);
  
              }
  
          }
  
  
  
          // Free the packet that was allocated by av_read_frame
  
          av_free_packet(&amp;packet);
  
      }
  
  
  
      /* 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(oc);
  
  
  
      /* Close video encoder (codec). */
  
      if (video_st)
  
          close_video(oc, video_st);
  
      // Free the streams.
  
      for (i = 0; i &lt; oc->nb_streams; i++) {
  
          av_freep(&amp;oc->streams[i]->codec);
  
          av_freep(&amp;oc->streams[i]);
  
      }
  
      if (!(fmt->flags &amp; AVFMT_NOFILE))
  
          /* Close the output file. */
  
          avio_close(oc->pb);
  
      /* free the stream */
  
      av_free(oc);
  
  
  
      // Free the YUV frame holding decoded frame
  
      av_free(pFrame);
  
  
  
      // Close the decoder (codec)
  
      avcodec_close(pCodecCtx);
  
  
  
      // Close the input video file
  
      avformat_close_input(&amp;pFormatCtx);
  
  
  
      return 0;
  
  }

  If I change the output format to an mp4, mov, or f4v by changing :

  // setup mux (FLV OUTPUT)
  
  filename = "output_file.flv";
  
  fmt = av_guess_format("flv", filename, NULL);
  
  if (fmt == NULL) {
  
      printf("Could not guess format.\n");
  
      return -1;
  
  }

  to

  // setup mux (MP4 OUTPUT)
  
  filename = "output_file.mp4";
  
  fmt = av_guess_format("mp4", filename, NULL);
  
  if (fmt == NULL) {
  
      printf("Could not guess format.\n");
  
      return -1;
  
  }

  Then the bitrate is honored. Here is the output of running with a mp4 output

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_file.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isomavc1mp42
  
      creation_time   : 2010-02-09 19:11:10
  
    Duration: 00:04:31.80, start: 0.000000, bitrate: 2314 kb/s
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2010-02-09 19:11:10
  
        handler_name    : (C) 2007 Google Inc. v08.13.2007.
  
      Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2186 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2010-02-09 19:11:10
  
        handler_name    : (C) 2007 Google Inc. v08.13.2007.
  
  [libx264 @ 02268b80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 02268b80] profile High, level 3.1
  
  [libx264 @ 02268b80] 264 - core 129 r2230 1cffe9f - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
  
  lock=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 chro
  
  ma_qp_offset=-2 threads=12 lookahead_threads=2 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=0 weightp=2 keyint=12 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=12 rc=abr mbtree=1 bitrate=150 ratetol=1.0 qco
  
  mp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output_file.mp4':
  
      Stream #0:0: Video: h264, yuv420p, 1280x720, q=-1--1, 150 kb/s, 90k tbn, 30 tbc
  
  encoded frame #0
  
  encoded frame #1
  
  encoded frame #2
  
  encoded frame #3
  
  .
  
  .
  
  .
  
  encoded frame #8142
  
  encoded frame #8143
  
  encoded frame #8144
  
  encoded frame #8145
  
  [libx264 @ 02174240] frame I:771   Avg QP:47.71  size:  2739
  
  [libx264 @ 02174240] frame P:5083  Avg QP:50.05  size:   833
  
  [libx264 @ 02174240] frame B:2264  Avg QP:48.16  size:    91
  
  [libx264 @ 02174240] consecutive B-frames: 59.6%  6.4%  9.0% 24.9%
  
  [libx264 @ 02174240] mb I  I16..4: 34.0% 65.8%  0.2%
  
  [libx264 @ 02174240] mb P  I16..4:  6.8%  3.0%  0.0%  P16..4:  8.5%  0.4%  1.7%  0.0%  0.0%    skip:79.6%
  
  [libx264 @ 02174240] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  1.8%  0.0%  0.0%  direct: 0.0%  skip:98.2%  L0:23.6% L1:76.4% BI: 0.0%
  
  [libx264 @ 02174240] final ratefactor: 57.62
  
  [libx264 @ 02174240] 8x8 transform intra:52.1% inter:98.5%
  
  [libx264 @ 02174240] coded y,uvDC,uvAC intra: 3.1% 14.0% 0.2% inter: 0.1% 0.4% 0.0%
  
  [libx264 @ 02174240] i16 v,h,dc,p: 69% 23%  4%  4%
  
  [libx264 @ 02174240] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23%  6% 68%  1%  1%  1%  1%  0%  0%
  
  [libx264 @ 02174240] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 18% 18%  4%  4%  5%  3%  3%  3%
  
  [libx264 @ 02174240] i8c dc,h,v,p: 98%  1%  1%  0%
  
  [libx264 @ 02174240] Weighted P-Frames: Y:2.1% UV:1.2%
  
  [libx264 @ 02174240] ref P L0: 72.4%  0.8% 19.1%  7.6%  0.1%
  
  [libx264 @ 02174240] ref B L0: 89.8%  9.1%  1.2%
  
  [libx264 @ 02174240] ref B L1: 96.2%  3.8%
  
  [libx264 @ 02174240] kb/s:193.62

  The final file size of output_file.mp4 is about 6.5MB and using ffplay, I notice that bitrate was honored. Of course the quality itself shows.

  Here is the output of running with a flv output :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_file.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isomavc1mp42
  
      creation_time   : 2010-02-09 19:11:10
  
    Duration: 00:04:31.80, start: 0.000000, bitrate: 2314 kb/s
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2010-02-09 19:11:10
  
        handler_name    : (C) 2007 Google Inc. v08.13.2007.
  
      Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 2186 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2010-02-09 19:11:10
  
        handler_name    : (C) 2007 Google Inc. v08.13.2007.
  
  Output #0, flv, to 'output_file.flv':
  
      Stream #0:0: Video: flv1, yuv420p, 1280x720, q=2-31, 150 kb/s, 90k tbn, 30 tbc
  
  encoded frame #0
  
  encoded frame #1
  
  encoded frame #2
  
  encoded frame #3
  
  .
  
  .
  
  .
  
  encoded frame #8142
  
  encoded frame #8143
  
  encoded frame #8144
  
  encoded frame #8145

  I noticed that the bitrate is honored as long as the container is a mp4, mov, f4v, or something similar. If I try flv, wmv, or other different containers, then the bitrate is not honored. Also, the bitrate that is automatically set for wmv is different from that of flv. I am not sure what I am doing wrong. I suspect it has to do with the pts, however, I cannot find a solution :(.

• FFMPEG - Converting any kind of file to Mp4 compatible with IOS and Flash

  5 février 2013, par arashaga

  I am struggling with FFmpeg whithing Drupal Video Module to produce files to MP4 that is compatible with IOS and Flash Player10 and up.
  I have used the following commands so far, please note that the variables starting with " !" are placeholders and will be replaces with the proper items :

  FFmpeg -strict experimental -y -i !videofile -pass 1 -s !widthx!height -b:v 500k -threads 0 -vcodec libx264 -vf "pad=!paddingwidth:!paddingheight:!paddingleft:!paddingtop:000000" -preset slow -an !convertfile
  
  
  
  FFmpeg -strict experimental -y -i !videofile -pass 2 -s !widthx!height -b:v 500k -threads 0 -vcodec libx264 -vf "pad=!paddingwidth:!paddingheight:!paddingleft:!paddingtop:000000" -preset slow -acodec aac -ab 128k !convertfile

  The above command produce an error as :

  error executing command for rendering preset HTML5 MP4, command #1 :

  nice -n 19 /usr/bin/ffmpeg/ffmpeg -y -i '80137db8c3_1334836277_int_tr_19.mp4' -s 176x100 -b:v 500k -threads 0 -vcodec libx264 -preset slow -acodec aac -ab 128k '/converted/80137db8c3_1334836277_int_tr_19.mp4' 2>&1
  
  
  
  Output:
  
  
  
  ffmpeg version git-2013-02-01-5a67e30 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Feb  1 2013 14:23:14 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      52. 17.100 / 52. 17.100
  
    libavcodec     54. 91.100 / 54. 91.100
  
    libavformat    54. 61.104 / 54. 61.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 35.100 /  3. 35.100
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '80137db8c3_1334836277_int_tr_19.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2011-03-28 00:12:26
  
    Duration: 00:02:01.14, start: 0.000000, bitrate: 703 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 601 kb/s, 29.96 fps, 29.92 tbr, 1k tbn, 59.83 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s
  
      Metadata:
  
        creation_time   : 2011-03-28 00:12:27
  
        handler_name    : (C) 2007 Google Inc. v08.13.2007.
  
  [libx264 @ 0x34ec060] using SAR=100/99
  
  [libx264 @ 0x34ec060] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x34ec060] profile High, level 2.0
  
  [libx264 @ 0x34ec060] 264 - core 129 r2245 bc13772 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=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=12 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=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  The encoder 'aac' is experimental but experimental codecs are not enabled, add '-strict -2' if you want to use it.
  
  Alternatively use the non experimental encoder 'libfaac'.

  Another command that I used is :

  FFmpeg -i !videofile -an -pass 1 -vcodec libx264 -preset slow -b 500k -threads auto !convertfile
  
  
  
  FFMpeg -y -i !videofile -acodec libfaac -ab 128k -pass 2 -vcodec libx264 -preset slow -b 500k -threads auto !convertfile

  Output for the first pass :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'comiccon.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      creation_time   : 2012-08-15 17:12:37
  
    Duration: 01:17:15.93, start: 0.000000, bitrate: 706 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 636 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : SoundHandler
  
  Please use -b:a or -b:v, -b is ambiguous
  
  
  
  using SAR=1/1
  
  [libx264 @ 0x1c39be0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x1c39be0] profile Main, level 3.0
  
  [libx264 @ 0x1c39be0] 264 - core 129 r2245 bc13772 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=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=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'comiccon.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      encoder         : Lavf54.61.104
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, pass 1, 500 kb/s, 15360 tbn, 30 tbc
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=139078 fps=279 q=32766.0 Lsize=  286145kB time=01:17:15.86 bitrate= 505.6kbits/s    
  
  video:284758kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.487000%
  
  [libx264 @ 0x1c39be0] frame I:656   Avg QP:19.51  size: 21457
  
  [libx264 @ 0x1c39be0] frame P:76006 Avg QP:22.19  size:  3141
  
  [libx264 @ 0x1c39be0] frame B:62416 Avg QP:26.38  size:   621
  
  [libx264 @ 0x1c39be0] consecutive B-frames: 32.3% 17.5% 18.6% 31.6%
  
  [libx264 @ 0x1c39be0] mb I  I16..4: 24.5%  0.0% 75.5%
  
  [libx264 @ 0x1c39be0] mb P  I16..4:  7.5%  0.0%  0.0%  P16..4: 40.5%  0.0%  0.0%  0.0%  0.0%    skip:52.1%
  
  [libx264 @ 0x1c39be0] mb B  I16..4:  1.4%  0.0%  0.0%  B16..8: 12.0%  0.0%  0.0%  direct: 2.9%  skip:83.7%  L0:41.1% L1:41.6% BI:17.3%
  
  [libx264 @ 0x1c39be0] final ratefactor: 23.45
  
  [libx264 @ 0x1c39be0] direct mvs  spatial:95.3% temporal:4.7%
  
  [libx264 @ 0x1c39be0] coded y,uvDC,uvAC intra: 37.6% 42.8% 11.8% inter: 8.9% 8.2% 0.5%
  
  [libx264 @ 0x1c39be0] i16 v,h,dc,p: 43% 28% 19% 10%
  
  [libx264 @ 0x1c39be0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 21% 11%  6%  4%  5%  4%  6%  6%
  
  [libx264 @ 0x1c39be0] i8c dc,h,v,p: 57% 19% 20%  4%
  
  [libx264 @ 0x1c39be0] Weighted P-Frames: Y:1.4% UV:0.5%
  
  [libx264 @ 0x1c39be0] kb/s:503.18

  output for the second pass :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'comiccon.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      creation_time   : 2012-08-15 17:12:37
  
    Duration: 01:17:15.93, start: 0.000000, bitrate: 706 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 636 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : SoundHandler
  
  Please use -b:a or -b:v, -b is ambiguous
  
  [libx264 @ 0x3247f80] using SAR=1/1
  
  [libx264 @ 0x3247f80] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x3247f80] profile High, level 3.0
  
  [libx264 @ 0x3247f80] 264 - core 129 r2245 bc13772 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=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=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=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=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=2pass mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 cplxblur=20.0 qblur=0.5 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'comiccon.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: mp41
  
      encoder         : Lavf54.61.104
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, pass 2, 500 kb/s, 15360 tbn, 30 tbc
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        creation_time   : 2012-08-15 17:12:37
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libx264)
  
    Stream #0:1 -> #0:1 (aac -> libfaac)
  
  Press [q] to stop, [?] for help
  
  frame=139078 fps=206 q=32766.0 Lsize=  357252kB time=01:17:15.93 bitrate= 631.3kbits/s    
  
  video:282992kB audio:69592kB subtitle:0 global headers:0kB muxing overhead 1.324238%
  
  [libx264 @ 0x3247f80] frame I:656   Avg QP:19.61  size: 20433
  
  [libx264 @ 0x3247f80] frame P:76006 Avg QP:23.07  size:  2996
  
  [libx264 @ 0x3247f80] frame B:62416 Avg QP:26.23  size:   780
  
  [libx264 @ 0x3247f80] consecutive B-frames: 32.3% 17.5% 18.6% 31.6%
  
  [libx264 @ 0x3247f80] mb I  I16..4: 17.2% 37.8% 44.9%
  
  [libx264 @ 0x3247f80] mb P  I16..4:  2.9%  3.7%  1.2%  P16..4: 30.3%  6.1%  3.4%  0.0%  0.0%    skip:52.5%
  
  [libx264 @ 0x3247f80] mb B  I16..4:  0.5%  0.6%  0.3%  B16..8: 25.9%  2.2%  0.5%  direct: 0.9%  skip:69.3%  L0:51.4% L1:43.0% BI: 5.7%
  
  [libx264 @ 0x3247f80] 8x8 transform intra:45.9% inter:51.5%
  
  [libx264 @ 0x3247f80] direct mvs  spatial:85.5% temporal:14.5%
  
  [libx264 @ 0x3247f80] coded y,uvDC,uvAC intra: 47.3% 49.2% 13.5% inter: 9.0% 9.4% 0.5%
  
  [libx264 @ 0x3247f80] i16 v,h,dc,p: 38% 27% 13% 22%
  
  [libx264 @ 0x3247f80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 16% 14%  5%  5%  7%  7%  8%  9%
  
  [libx264 @ 0x3247f80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 15%  9%  6%  7%  8%  7%  8%  8%
  
  [libx264 @ 0x3247f80] i8c dc,h,v,p: 49% 22% 20%  8%
  
  [libx264 @ 0x3247f80] Weighted P-Frames: Y:1.4% UV:0.5%
  
  [libx264 @ 0x3247f80] ref P L0: 79.3% 10.4%  6.8%  1.6%  1.2%  0.7%  0.0%
  
  [libx264 @ 0x3247f80] ref B L0: 93.6%  4.8%  1.2%  0.3%
  
  [libx264 @ 0x3247f80] ref B L1: 96.6%  3.4%
  
  [libx264 @ 0x3247f80] kb/s:500.06

  The above command produces the file correctly however it cannot be played in flash player. One thing that I noticed is this may happen if the input file is mp4 as well. This command is executed for users uploading files, so the input file could be any format.

  Below is the information about my FFmpeg version :

  ffmpeg version git-2013-02-01-5a67e30 Copyright (c) 2000-2013 the
  FFmpeg developers built on Feb 1 2013 14:23:14 with gcc 4.6
  (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration : —enable-gpl
  —enable-libass —enable-libfaac —enable-libfdk-aac —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-librtmp —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libx264 —enable-nonfree —enable-version3 libavutil 52. 17.100 / 52. 17.100
  libavcodec 54. 91.100 / 54. 91.100
  libavformat 54. 61.104 / 54. 61.104
  libavdevice 54. 3.103 / 54. 3.103
  libavfilter 3. 35.100 / 3. 35.100
  libswscale 2. 2.100 / 2. 2.100
  libswresample 0. 17.102 / 0. 17.102
  libpostproc 52. 2.100 / 52. 2.1

  Thanks,