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• trying to figure out what's wrong in the code using ffmpeg.exe

  5 octobre 2013, par timmack

  I'm trying to upload videos and convert it to flv format as well as capturing image as thumbnails.I'm using visual web developer 2008 express edition.I've done so many research online and found something using ffmpeg.exe so I've downloaded an ffmpeg.exe and has tried so many codes but unfortunately I'm still unable to make it work.I want to save the converted video file to a certain folder in my server as well as the captured image as for its thumbnails after uploading the video.I'm not sure if the ffmpeg.exe has the problem or my codes but I suspect it's in my codes.I need somebody to help me find out what's something missing on my codes to make it work. Here's my codes below for your reference. Thanks

  protected void Button1_Click(object sender, EventArgs e)
  
      {
  
          //Convert the Video to flv format with FFMPEG
  
        string  ffmpegPath = Server.MapPath("~/ffmpeg/ffmpeg.exe");
  
        string tempLocation = Server.MapPath("~/tempVideos/");
  
        string mediaOutPath = Server.MapPath("~/Videos/");
  
        string thumbOutPath = Server.MapPath("~/Thumbs/");
  
        string currentFile = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
  
  
  
  
  
  
  
  //Upload the video     
  
  
  
  string vidPath = "Videos/" + outputfile;
  
  
  
  if (FileUpload1.PostedFile != null && FileUpload1.PostedFile.FileName != "")
  
  {
  
      try
  
  {
  
      // 10240 KB means 10MB, You can change the value based on your requirement
  
      if (FileUpload1.PostedFile.ContentLength > 1024000000)
  
      {
  
          Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Alert", "alert('File is too big.')", true);
  
      }
  
      else
  
      {
  
          //then save it to the Folder
  
  
  
  
  
          Convert(tempLocation + currentFile, mediaOutPath + currentFile, thumbOutPath + currentFile);
  
  
  
         FileUpload1.PostedFile.SaveAs(tempLocation + currentFile);
  
  
  
  
  
      }
  
           }
  
  catch (Exception ex)
  
  {
  
  Response.Write("Error: " + ex.Message);
  
  }
  
  }
  
  
  
  Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Alert", "alert('Video file has been uploaded!')", true);
  
  FlashVideo1.VideoURL = "tempVideos/" + currentFile;
  
  }
  
  
  
  protected void Convert(string fileIn, string fileOut, string thumbOut)
  
  {
  
  try
  
  {
  
  
  
      string mediaOutPath = Server.MapPath("~/Videos/");
  
      string thumbOutPath = Server.MapPath("~/Thumbs/");
  
      string inputfile = FileUpload1.PostedFile.FileName;
  
  
  
      string infile = Path.GetFileNameWithoutExtension(inputfile);
  
  
  
      fileIn = Path.GetFullPath( inputfile);
  
  
  
      fileOut = mediaOutPath + inputfile;
  
      thumbOut = inputfile;
  
  
  
  string ffmpegPath = Server.MapPath("~/ffmpeg/ffmpeg.exe");
  
  System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
  proc.EnableRaisingEvents = true;
  
  proc.StartInfo.FileName = ffmpegPath;
  
  
  
  
  
  //converting video to flv format
  
  proc.StartInfo.Arguments = "-i " + fileIn + "-ar 22050 -ab 32 -f flv -s 320×240 -aspect 4:3 -y" + fileOut.Split('.')[0] + ".flv";
  
  proc.StartInfo.UseShellExecute = false;
  
  proc.StartInfo.CreateNoWindow = false;
  
  proc.StartInfo.RedirectStandardError = true;
  
  proc.StartInfo.RedirectStandardOutput = true;
  
  proc.Start();
  
  proc.WaitForExit();
  
  
  
  //capturing thumbnail image of the video 
  
  proc.StartInfo.Arguments = "-i \"{0}\" -an -y -s 320x240 -ss {1} -vframes 1 -f image2 \"{2}\"" + fileIn + thumbOut.Split('.')[0] + ".jpg";
  
  proc.StartInfo.UseShellExecute = false;
  
  proc.StartInfo.CreateNoWindow = false;
  
  proc.StartInfo.RedirectStandardError = true;
  
  proc.StartInfo.RedirectStandardOutput = true;
  
  proc.Start();
  
  proc.WaitForExit();
  
  proc.Close();
  
  }
  
  catch (Exception ex)
  
  {
  
  Response.Write("Error: " + ex.Message);
  
  }
  
  }

• extracting h264 raw video stream from mp4 or flv with ffmpeg generate an invalid stream

  10 octobre 2013, par neo2006

  I'm trying to extract the video stream from an mp4 or flv h264 video (youtube video) using ffmpeg. The original video (test.flv) play without trouble with ffplay , ffprobe gives an error as follow :

  ffprobe version N-55515-gbbbd959 Copyright (c) 2007-2013 the FFmpeg developers
  
  built on Aug 13 2013 18:06:32 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 42.100 / 52. 42.100
  
    libavcodec     55. 27.100 / 55. 27.100
  
    libavformat    55. 13.102 / 55. 13.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [flv @ 000000000031ea80] Stream discovered after head already parsed
  
  Input #0, flv, from 'test.flv':
  
    Metadata:
  
      starttime       : 0
  
      totalduration   : 142
  
      totaldatarate   : 692
  
      bytelength      : 12286492
  
      canseekontime   : true
  
      sourcedata      : B42B95507HH1381414522145462
  
      purl            :
  
      pmsg            :
  
    Duration: 00:02:22.02, start: 0.000000, bitrate: 692 kb/s
  
      Stream #0:0: Video: h264 (Main), yuv420p, 640x268, 568 kb/s, 23.98 tbr, 1k t
  
  bn, 47.95 tbc
  
      Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp, 131 kb/s
  
      Stream #0:2: Data: none
  
  Unsupported codec with id 0 for input stream 2

  to get rid of the extra streams ( I only needs the video) I used the following ffmpeg command line :

  ffmpeg -i test.flv -map 0:0 -vcodec copy -an -f h264 test.h264

  The new stream is unreadable by any player including ffplay and gives an error with ffprobe :
  test.h264 : Invalid data found when processing inputq= 0B f=0/0

  Any body have an idea about what am I doing wrong ?

  I also tried simpler youtube command line :

  ffmpeg -i test.flv -vcodec copy -an test.h264

  if I use another format (avi for example) :

  ffmpeg -i test.flv -vcodec copy -an test.avi

  the output video is valid.

  If I transcode the video

  ffmpeg -i test.flv -an test.h264

  the output is also valid

  Any suggestions ?

• What's wrong with my use of timestamps/timebases for frame seeking/reading using libav (ffmpeg) ?

  17 septembre 2013, par mtree

  So I want to grab a frame from a video at a specific time using libav for the use as a thumbnail.

  What I'm using is the following code. It compiles and works fine (in regards to retrieving a picture at all), yet I'm having a hard time getting it to retrieve the right picture.

  I simply can't get my head around the all but clear logic behind libav's apparent use of multiple time-bases per video. Specifically figuring out which functions expect/return which type of time-base.

  The docs were of basically no help whatsoever, unfortunately. SO to the rescue ?

  #define ABORT(x) do {fprintf(stderr, x); exit(1);} while(0)
  
  
  
  av_register_all();
  
  
  
  AVFormatContext *format_context = ...;
  
  AVCodec *codec = ...;
  
  AVStream *stream = ...;
  
  AVCodecContext *codec_context = ...;
  
  int stream_index = ...;
  
  
  
  // open codec_context, etc.
  
  
  
  AVRational stream_time_base = stream->time_base;
  
  AVRational codec_time_base = codec_context->time_base;
  
  
  
  printf("stream_time_base: %d / %d = %.5f\n", stream_time_base.num, stream_time_base.den, av_q2d(stream_time_base));
  
  printf("codec_time_base: %d / %d = %.5f\n\n", codec_time_base.num, codec_time_base.den, av_q2d(codec_time_base));
  
  
  
  AVFrame *frame = avcodec_alloc_frame();
  
  
  
  printf("duration: %lld @ %d/sec (%.2f sec)\n", format_context->duration, AV_TIME_BASE, (double)format_context->duration / AV_TIME_BASE);
  
  printf("duration: %lld @ %d/sec (stream time base)\n\n", format_context->duration / AV_TIME_BASE * stream_time_base.den, stream_time_base.den);
  
  printf("duration: %lld @ %d/sec (codec time base)\n", format_context->duration / AV_TIME_BASE * codec_time_base.den, codec_time_base.den);
  
  
  
  double request_time = 10.0; // 10 seconds. Video's total duration is ~20sec
  
  int64_t request_timestamp = request_time / av_q2d(stream_time_base);
  
  printf("requested: %.2f (sec)\t-> %2lld (pts)\n", request_time, request_timestamp);
  
  
  
  av_seek_frame(format_context, stream_index, request_timestamp, 0);
  
  
  
  AVPacket packet;
  
  int frame_finished;
  
  do {
  
      if (av_read_frame(format_context, &packet) < 0) {
  
          break;
  
      } else if (packet.stream_index != stream_index) {
  
          av_free_packet(&packet);
  
          continue;
  
      }
  
      avcodec_decode_video2(codec_context, frame, &frame_finished, &packet);
  
  } while (!frame_finished);
  
  
  
  // do something with frame
  
  
  
  int64_t received_timestamp = frame->pkt_pts;
  
  double received_time = received_timestamp * av_q2d(stream_time_base);
  
  printf("received:  %.2f (sec)\t-> %2lld (pts)\n\n", received_time, received_timestamp);

  Running this with a test movie file I get this output :

      stream_time_base: 1 / 30000 = 0.00003
  
      codec_time_base: 50 / 2997 = 0.01668
  
  
  
      duration: 20062041 @ 1000000/sec (20.06 sec)
  
      duration: 600000 @ 30000/sec (stream time base)
  
      duration: 59940 @ 2997/sec (codec time base)
  
  
  
      requested: 10.00 (sec)  -> 300000 (pts)
  
      received:  0.07 (sec)   -> 2002 (pts)

  The times don't match. What's going on here ? What am I doing wrong ?

  ---

  While searching for clues I stumbled upon this this statement from the libav-users mailing list…

  [...] packet PTS/DTS are in units of the format context's time_base,
  where the AVFrame->pts value is in units of the codec context's time_base.

  In other words, the container can have (and usually does) a different
  time_base than the codec. Most libav players don't bother using the
  codec's time_base or pts since not all codecs have one, but most
  containers do. (This is why the dranger tutorial says to ignore AVFrame->pts)

  …which confused me even more, given that I couldn't find any such mention in the official docs.

  Anyway, I replaced…

  double received_time = received_timestamp * av_q2d(stream_time_base);

  …with…

  double received_time = received_timestamp * av_q2d(codec_time_base);

  …and the output changed to this…

  ...
  
  
  
  requested: 10.00 (sec)  -> 300000 (pts)
  
  received:  33.40 (sec)  -> 2002 (pts)

  Still no match. What's wrong ?