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• asp.net ffmpeg : The system cannot find the file specified

  19 juin 2016, par Malik

  I am doing code for extracting image from video using ffmpeg. But gone stuck what this means. I also have checked

  ffmpeg -i F:\MIC\stream\finalstream\casper\small.mp4  -an -ss 00:00:03 -s 108*80 -vframes 1 -f image2 -vcodec mjpeg F:/MIC/stream/finalstream/caspe
  
  r/output11.png 

  on cmd line and working fine but dont understand why this is not happening in asp.net ?

  here is my code this function happens on button click event :

  protected void Capture(object sender, EventArgs e)
  
          {
  
  
  
              string InputFile = @"F:\MIC\stream\finalstream\casper\small.mp4";
  
              string ThumbnailsPath = @"F:\MIC\stream\finalstream\casper\testimage.jpg";
  
              System.Diagnostics.Process proc = new System.Diagnostics.Process();
  
              proc.EnableRaisingEvents = false;
  
              proc.StartInfo.FileName = Page.MapPath("~/ffmpeg.exe");
  
              proc.StartInfo.Arguments = "-i F:/MIC/stream/finalstream/casper/small.mp4  -an -ss 00:00:03 -s 108*80 -vframes 1 -f image2 -vcodec mjpeg F:/MIC/stream/finalstream/casper/ output11.png";
  
              proc.Start();
  
  
  
  
  
          }

  while running i got this Error :
  

  Any idea ????

• convert video with ffmpeg command line. but the video stream and audio stream are out of sync

  24 juin 2016, par zack chen

  I use ffmpeg cmd to convert some mkv video files to flv.

  The source files are downloaded from this site : Sample mkv files

  ffmpeg -i input.mkv -c:v libx264 -crf 20 -preset ultrafast -c:a aac -ar 22050 -y output.flv

  However the output video seems lose some frames, the FPS dropped from 25 to 5 suddenly and The video stream and audio stream are out of sync.

  I tested some mkv files downloaded from another site, the output file could play well.
  So, I guess it may be caused by the mkv files downloaded from the site : http://www.sample-videos.com/index.php#sample-mkv-video

  But i couldn’t find the reason. Could you help me ?

  I get the video info by ffprobe, as below.

  {
  
  "streams": [
  
      {
  
          "index": 0,
  
          "codec_name": "h264",
  
          "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
          "profile": "Main",
  
          "codec_type": "video",
  
          "codec_time_base": "1/50",
  
          "codec_tag_string": "[0][0][0][0]",
  
          "codec_tag": "0x0000",
  
          "width": 320,
  
          "height": 240,
  
          "coded_width": 320,
  
          "coded_height": 240,
  
          "has_b_frames": 0,
  
          "sample_aspect_ratio": "1:1",
  
          "display_aspect_ratio": "4:3",
  
          "pix_fmt": "yuv420p",
  
          "level": 20,
  
          "chroma_location": "left",
  
          "refs": 1,
  
          "is_avc": "true",
  
          "nal_length_size": "4",
  
          "r_frame_rate": "25/1",
  
          "avg_frame_rate": "25/1",
  
          "time_base": "1/1000",
  
          "duration_ts": 9818,
  
          "duration": "9.818000",
  
          "bits_per_raw_sample": "8",
  
          "disposition": {
  
              "default": 1,
  
              "dub": 0,
  
              "original": 0,
  
              "comment": 0,
  
              "lyrics": 0,
  
              "karaoke": 0,
  
              "forced": 0,
  
              "hearing_impaired": 0,
  
              "visual_impaired": 0,
  
              "clean_effects": 0,
  
              "attached_pic": 0
  
          }
  
      },
  
      {
  
          "index": 1,
  
          "codec_name": "aac",
  
          "codec_long_name": "AAC (Advanced Audio Coding)",
  
          "profile": "LC",
  
          "codec_type": "audio",
  
          "codec_time_base": "1/48000",
  
          "codec_tag_string": "[0][0][0][0]",
  
          "codec_tag": "0x0000",
  
          "sample_fmt": "fltp",
  
          "sample_rate": "48000",
  
          "channels": 6,
  
          "channel_layout": "5.1",
  
          "bits_per_sample": 0,
  
          "r_frame_rate": "0/0",
  
          "avg_frame_rate": "0/0",
  
          "time_base": "1/1000",
  
          "duration_ts": 9818,
  
          "duration": "9.818000",
  
          "disposition": {
  
              "default": 1,
  
              "dub": 0,
  
              "original": 0,
  
              "comment": 0,
  
              "lyrics": 0,
  
              "karaoke": 0,
  
              "forced": 0,
  
              "hearing_impaired": 0,
  
              "visual_impaired": 0,
  
              "clean_effects": 0,
  
              "attached_pic": 0
  
          }
  
      }
  
  ],
  
  "format": {
  
      "filename": "big_buck_bunny_240p_1mb.mkv",
  
      "nb_streams": 2,
  
      "nb_programs": 0,
  
      "format_name": "matroska,webm",
  
      "format_long_name": "Matroska / WebM",
  
      "duration": "9.818000",
  
      "size": "1055721",
  
      "bit_rate": "860233",
  
      "probe_score": 100,
  
      "tags": {
  
          "ENCODER": "Lavf53.24.2"
  
      }
  
  }
  
  }

• C++, FFMpeg : Unable to find any decoder or encoder

  14 juillet 2016, par AmN

  I have been using this sample https://ffmpeg.org/doxygen/trunk/decoding__encoding_8c.html as reference for my C++ application. I have used the same code as in the given page. I have linked the libraries, placed the dlls and compiled with no errors. Everything works except that it always throws : Codec not found error.

  /* find the MPEG-1 video decoder */
  
  codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
  
  if (!codec) {
  
      fprintf(stderr, "Codec not found\n");
  
      exit(1);
  
  }

  I have changed the line to AV_CODEC_ID_MP2 in this, just to test if only the MPEG codex was missing but seems like all are missing. I have tried changing this to multiple codecs as defined in avcodec.h file (enum AVCodecID, line 189), but all return "Codec not found".

  Am I missing something ?

  Compiler : Microsoft Visual Studio 2015 Community Edition
  Project Type : QTProject

  Oh and I am trying to make a Video Player just to enhance my c++ skills during these holidays. First I was trying QTMediaPlayer Widget, but it was throwing crazy errors on "DirectShowPlay::doRender" or something like that. So I switched to FFMpeg, but this too doesn’t work.

  Thank you for reading my question.